The release notes for this release can be found here.

Binary distributions

Instead of manually downloading this binary, please explore first whether your package manager already provides this version. This way, you will automatically keep up-to-date with the latest stable versions with no manual maintenance on your side.

Source distribution

Installations in CVMFS

Standalone installations with minimal external dependencies are available at:

/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.40.02/arm64-mac157-clang170-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.40.02/arm64-mac265-clang210-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.40.02/x86_64-almalinux10.2-gcc143-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.40.02/x86_64-almalinux8.10-gcc85-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.40.02/x86_64-almalinux9.8-gcc115-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.40.02/x86_64-debian13-gcc142-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.40.02/x86_64-fedora43-gcc152-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.40.02/x86_64-fedora44-gcc161-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.40.02/x86_64-mac148-clang160-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.40.02/x86_64-ubuntu22.04-gcc114-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.40.02/x86_64-ubuntu24.04-gcc133-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.40.02/x86_64-ubuntu26.04-gcc152-opt

Git

The entire ROOT source can be obtained from our public Git repository:

git clone https://github.com/root-project/root.git

The release specific tag can be obtained using:

cd root
git checkout -b v6-40-02 v6-40-02

See instructions to build from source.

Windows

Windows 11 is supported. We offer two packaging types:

• exe: a regular Windows installer package also setting up the required environment variables. With uninstall via “Control Panel” / “Add or Remove Programs”. Simply download and start. You can double-click ROOT to run it; ROOT files get registered with Windows.
• tar: unpack e.g. with 7zip. Start ROOT in a Microsoft Visual Studio Prompt (in Start / Programs / Microsoft Visual Studio / Tools). If you installed ROOT to C:\root then call C:\root\bin\thisroot.bat before using ROOT to set up required environment variables. Call instead thisroot.ps1 if you run from a powershell (the default terminal in Visual Studio Code).

Important installation notes

• You must download the binary built with the exact same version of Visual Studio (and Python) than the one installed on your system.
• Don’t forget to select the component “Desktop development with C++” when running the Visual Studio Installer.
• Do not untar in a directory with a name containing blank characters.
• Take the release version if performance matters.
• If you want to debug your code you need the ROOT debug build (you cannot mix release / debug builds due to a Microsoft restriction).

The full release notes for this release can be found here.

This release represents a massive leap toward the future of ROOT 7. We’ve unlocked game-changing capabilities, including the ability to opt-out of automatic class registration, experimental access to high-performance, multithreading-optimized histograms, and a sleek, ergonomic new file interface (RFile) designed for modern workflows.

But we didn’t stop there. We’ve streamlined the entire codebase for peak efficiency and addressed over 160 items in our trackers to ensure rock-solid stability and cutting-edge features (see the full list here). Dive into the full release notes and explore the highlights below!

🔓Opt-out of automatic class registration Break free from histograms and objects automatically attaching to the current (T)directory! Enable this game-changing capability invoking ROOT::Experimental::DisableObjectAutoRegistration(): unlock more control by exploring the documentation.

📊 Histograms More features in the new histograms! Concurrent filling is now available, also to save memory in highly multithreaded applications. This feature is even integrated into RDataFrame: check out the tutorials!

🤖 Machine Learning The Data Loader has been reimagined as ROOT::Experimental::ML::RDataLoader! This powerful tool now performs cluster-aligned reads with a sophisticated shuffling strategy and supports multiple RDataFrames as input. Seamlessly output to NumPy, PyTorch, or TensorFlow, while leveraging new under- and oversampling support for dual-class eager loading.

💾 I/O Experience a brand-new, streamlined HTTP I/O implementation powered by libcurl! This update delivers modern remote read capabilities, including advanced compression, secure transport, and S3 support, all across 🐧🍎🪟.

🔀 RNTuple Multiple threads can share a single reader efficiently thanks to the “active entry tokens” added to the RNTupleReader: very useful for data processing frameworks!

🌳 Ready to evolve beyond TTree::Draw? We’ve provided a comprehensive Rosetta Stone to help you seamlessly transition to RDataFrame! This is the perfect path for high-performance RNTuple support or scaling your workflows across multithreaded and distributed environments.

🚀 RDataFrame analysis By streamlining the memory ownership model and implementing a sophisticated sharing mechanism, RDataFrame now minimizes redundant just-in-time compilation across computation graphs. Experience faster setup times and a significant reduction in memory footprint within a single application!

📦 Builtins We’ve dramatically streamlined our codebase. The builtin package footprints have been slashed by a factor of 4x. This makes ROOT lighter and faster to build than ever, while pivoting toward a robust reliance on high-performance system packages.

Binary distributions

Instead of manually downloading this binary, please explore first whether your package manager already provides this version. This way, you will automatically keep up-to-date with the latest stable versions with no manual maintenance on your side.

Source distribution

Installations in CVMFS

Standalone installations with minimal external dependencies are available at:

/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.40.00/arm64-mac157-clang170-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.40.00/arm64-mac264-clang210-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.40.00/x86_64-almalinux10.1-gcc143-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.40.00/x86_64-almalinux8.10-gcc85-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.40.00/x86_64-almalinux9.7-gcc115-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.40.00/x86_64-debian13-gcc142-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.40.00/x86_64-fedora43-gcc152-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.40.00/x86_64-fedora44-gcc161-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.40.00/x86_64-mac148-clang160-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.40.00/x86_64-ubuntu22.04-gcc114-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.40.00/x86_64-ubuntu24.04-gcc133-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.40.00/x86_64-ubuntu26.04-gcc152-opt

Git

The entire ROOT source can be obtained from our public Git repository:

git clone https://github.com/root-project/root.git

The release specific tag can be obtained using:

cd root
git checkout -b v6-40-00 v6-40-00

See instructions to build from source.

Windows

Windows 11 is supported. We offer two packaging types:

• exe: a regular Windows installer package also setting up the required environment variables. With uninstall via “Control Panel” / “Add or Remove Programs”. Simply download and start. You can double-click ROOT to run it; ROOT files get registered with Windows.
• tar: unpack e.g. with 7zip. Start ROOT in a Microsoft Visual Studio Prompt (in Start / Programs / Microsoft Visual Studio / Tools). If you installed ROOT to C:\root then call C:\root\bin\thisroot.bat before using ROOT to set up required environment variables. Call instead thisroot.ps1 if you run from a powershell (the default terminal in Visual Studio Code).

Important installation notes

• You must download the binary built with the exact same version of Visual Studio (and Python) than the one installed on your system.
• Don’t forget to select the component “Desktop development with C++” when running the Visual Studio Installer.
• Do not untar in a directory with a name containing blank characters.
• Take the release version if performance matters.
• If you want to debug your code you need the ROOT debug build (you cannot mix release / debug builds due to a Microsoft restriction).

Release Notes

The release notes for this release can be found here.

Binary distributions

Instead of manually downloading this binary, please explore first whether your package manager already provides this version. This way, you will automatically keep up-to-date with the latest stable versions with no manual maintenance on your side.

Source distribution

Installations in CVMFS

Standalone installations with minimal external dependencies are available at:

/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.40.00-rc1/arm64-mac264-clang210-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.40.00-rc1/x86_64-almalinux10.1-gcc143-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.40.00-rc1/x86_64-almalinux8.10-gcc85-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.40.00-rc1/x86_64-almalinux9.7-gcc115-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.40.00-rc1/x86_64-debian13-gcc142-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.40.00-rc1/x86_64-fedora43-gcc152-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.40.00-rc1/x86_64-fedora44-gcc160-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.40.00-rc1/x86_64-mac148-clang160-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.40.00-rc1/x86_64-ubuntu22.04-gcc114-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.40.00-rc1/x86_64-ubuntu24.04-gcc133-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.40.00-rc1/x86_64-ubuntu26.04-gcc152-opt

Git

The entire ROOT source can be obtained from our public Git repository:

git clone https://github.com/root-project/root.git

The release specific tag can be obtained using:

cd root
git checkout -b v6-40-00-rc1 v6-40-00-rc1

See instructions to build from source.

Windows

Windows 10/7/… are supported. We offer two packaging types:

• exe: a regular Windows installer package also setting up the required environment variables. With uninstall via “Control Panel” / “Add or Remove Programs”. Simply download and start. You can double-click ROOT to run it; ROOT files get registered with Windows.
• tar: unpack e.g. with 7zip. Start ROOT in a Microsoft Visual Studio Prompt (in Start / Programs / Microsoft Visual Studio / Tools). If you installed ROOT to C:\root then call C:\root\bin\thisroot.bat before using ROOT to set up required environment variables. Call instead thisroot.ps1 if you run from a powershell (the default terminal in Visual Studio Code).

Important installation notes

• You must download the binary built with the exact same version of Visual Studio (and Python) than the one installed on your system.
• Don’t forget to select the component “Desktop development with C++” when running the Visual Studio Installer.
• Do not untar in a directory with a name containing blank characters.
• Take the release version if performance matters.
• If you want to debug your code you need the ROOT debug build (you cannot mix release / debug builds due to a Microsoft restriction).

This is the last patch of the 6.38 series. The release notes can be found here.

Binary distributions

Instead of manually downloading this binary, please explore first whether your package manager already provides this version. This way, you will automatically keep up-to-date with the latest stable versions with no manual maintenance on your side.

Source distribution

Installations in CVMFS

Standalone installations with minimal external dependencies are available at:

/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.06/arm64-mac265-clang210-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.06/x86_64-almalinux10.2-gcc143-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.06/x86_64-almalinux8.10-gcc85-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.06/x86_64-almalinux9.8-gcc115-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.06/x86_64-debian13-gcc142-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.06/x86_64-fedora43-gcc152-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.06/x86_64-mac148-clang160-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.06/x86_64-ubuntu22.04-gcc114-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.06/x86_64-ubuntu24.04-gcc133-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.06/x86_64-ubuntu25.10-gcc152-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.06/x86_64-ubuntu26.04-gcc152-opt

Git

The entire ROOT source can be obtained from our public Git repository:

git clone https://github.com/root-project/root.git

The release specific tag can be obtained using:

cd root
git checkout -b v6-38-06 v6-38-06

See instructions to build from source.

Windows

Windows 10/7/… are supported. We offer two packaging types:

• exe: a regular Windows installer package also setting up the required environment variables. With uninstall via “Control Panel” / “Add or Remove Programs”. Simply download and start. You can double-click ROOT to run it; ROOT files get registered with Windows.
• tar: unpack e.g. with 7zip. Start ROOT in a Microsoft Visual Studio Prompt (in Start / Programs / Microsoft Visual Studio / Tools). If you installed ROOT to C:\root then call C:\root\bin\thisroot.bat before using ROOT to set up required environment variables. Call instead thisroot.ps1 if you run from a powershell (the default terminal in Visual Studio Code).

Important installation notes

• You must download the binary built with the exact same version of Visual Studio (and Python) than the one installed on your system.
• Don’t forget to select the component “Desktop development with C++” when running the Visual Studio Installer.
• Do not untar in a directory with a name containing blank characters.
• Take the release version if performance matters.
• If you want to debug your code you need the ROOT debug build (you cannot mix release / debug builds due to a Microsoft restriction).

The release notes for this release can be found here.

Binary distributions

Instead of manually downloading this binary, please explore first whether your package manager already provides this version. This way, you will automatically keep up-to-date with the latest stable versions with no manual maintenance on your side.

Source distribution

Installations in CVMFS

Standalone installations with minimal external dependencies are available at:

/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.04/arm64-mac263-clang170-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.04/x86_64-almalinux10.1-gcc143-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.04/x86_64-almalinux8.10-gcc85-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.04/x86_64-almalinux9.7-gcc115-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.04/x86_64-debian13-gcc142-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.04/x86_64-fedora42-gcc152-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.04/x86_64-fedora43-gcc152-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.04/x86_64-mac148-clang160-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.04/x86_64-ubuntu22.04-gcc114-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.04/x86_64-ubuntu24.04-gcc133-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.04/x86_64-ubuntu25.10-gcc152-opt

Git

The entire ROOT source can be obtained from our public Git repository:

git clone https://github.com/root-project/root.git

The release specific tag can be obtained using:

cd root
git checkout -b v6-38-04 v6-38-04

See instructions to build from source.

Windows

Windows 10/7/… are supported. We offer two packaging types:

• exe: a regular Windows installer package also setting up the required environment variables. With uninstall via “Control Panel” / “Add or Remove Programs”. Simply download and start. You can double-click ROOT to run it; ROOT files get registered with Windows.
• tar: unpack e.g. with 7zip. Start ROOT in a Microsoft Visual Studio Prompt (in Start / Programs / Microsoft Visual Studio / Tools). If you installed ROOT to C:\root then call C:\root\bin\thisroot.bat before using ROOT to set up required environment variables. Call instead thisroot.ps1 if you run from a powershell (the default terminal in Visual Studio Code).

Important installation notes

• You must download the binary built with the exact same version of Visual Studio (and Python) than the one installed on your system.
• Don’t forget to select the component “Desktop development with C++” when running the Visual Studio Installer.
• Do not untar in a directory with a name containing blank characters.
• Take the release version if performance matters.
• If you want to debug your code you need the ROOT debug build (you cannot mix release / debug builds due to a Microsoft restriction).

The release notes for this release can be found here.

Binary distributions

Instead of manually downloading this binary, please explore first whether your package manager already provides this version. This way, you will automatically keep up-to-date with the latest stable versions with no manual maintenance on your side.

Source distribution

Installations in CVMFS

Standalone installations with minimal external dependencies are available at:

/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.02/arm64-mac263-clang170-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.02/x86_64-almalinux10.1-gcc143-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.02/x86_64-almalinux8.10-gcc85-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.02/x86_64-almalinux9.7-gcc115-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.02/x86_64-debian13-gcc142-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.02/x86_64-fedora42-gcc152-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.02/x86_64-fedora43-gcc152-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.02/x86_64-mac148-clang160-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.02/x86_64-ubuntu22.04-gcc114-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.02/x86_64-ubuntu24.04-gcc133-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.02/x86_64-ubuntu25.10-gcc152-opt

Git

The entire ROOT source can be obtained from our public Git repository:

git clone https://github.com/root-project/root.git

The release specific tag can be obtained using:

cd root
git checkout -b v6-38-02 v6-38-02

See instructions to build from source.

Windows

Windows 10/7/… are supported. We offer two packaging types:

• exe: a regular Windows installer package also setting up the required environment variables. With uninstall via “Control Panel” / “Add or Remove Programs”. Simply download and start. You can double-click ROOT to run it; ROOT files get registered with Windows.
• tar: unpack e.g. with 7zip. Start ROOT in a Microsoft Visual Studio Prompt (in Start / Programs / Microsoft Visual Studio / Tools). If you installed ROOT to C:\root then call C:\root\bin\thisroot.bat before using ROOT to set up required environment variables. Call instead thisroot.ps1 if you run from a powershell (the default terminal in Visual Studio Code).

Important installation notes

• You must download the binary built with the exact same version of Visual Studio (and Python) than the one installed on your system.
• Don’t forget to select the component “Desktop development with C++” when running the Visual Studio Installer.
• Do not untar in a directory with a name containing blank characters.
• Take the release version if performance matters.
• If you want to debug your code you need the ROOT debug build (you cannot mix release / debug builds due to a Microsoft restriction).

The release notes for this release can be found here.

The focus for this release was on expanding usability from Python and interoperability with its ecosystem, data analysis and modernisation. However, there is much more than that: ease of installation, runtime performance, stability (>250 items in our trackers have been addressed). See the full release notes and highlights below!

📦 Distribution

• In alpha mode, you can install 6.38 releases with pip on Linux: pip install root 🚀

📈 RDataFrame

• Ergonomics: You don’t need to write template arguments for Snapshot any more
• You can snapshot systematic variations to TTree in experimental mode. See systematic variations for the details!
• Distributed RDataFrame: RNTuples are treated internally as TTrees. Without API changes, your processing of RNTuples will be even faster than before!

🐍 Python Interface

• In RDataFrame, you can pass to Define and Filter a set of Python functions wider than before.
• An enhanced Unified Histogram Interface (UHI) implementation is now even more stable, thanks to a reinforced testing suite extending the UHI testing helper.

7️⃣ ROOT7

• New highly performant histograms are available for testing: see these examples!
• ROOT::Experimental::RFile, a minimal and modern interface to ROOT files, is there!

💾 RNTuple

• Clarity: you can support RNTuple with the classic browser, profiting from several visual improvements, including a new treemap visualization of field sizes.
• Parallelism: The parallel writer became part of the stable API. See it in action in this example.
• Performance: (vectors of) fixed-size arrays are now treated in bulk
• Usability: automatic schema evolution is now akin to the classic I/O behavior. You can read expert documentation in tree/ntuple/doc/SchemaEvolution.md.

🧑🏽‍💻 C++ Interpreter

• The LLVM powering Cling has been upgraded to version 20: more runtime performance and features thanks to the new compiler!
• You can use SYCL interactively if you build ROOT with -Dexperimental_adaptivecpp=ON.

📊 RooFit

• With the RooMultiPdf, you can minimize floating categorical variables, e.g. for models with variables that toggle between different background shapes.

Please note that 6.38 is a short term support release. As such, it is not meant to be used for data taking. It will be superseded by the 6.40 release, which is foreseen in May 2026. Patch releases of 6.38 will be provided until June 2026.

Binary distributions

Instead of manually downloading this binary, please explore first whether your package manager already provides this version. This way, you will automatically keep up-to-date with the latest stable versions with no manual maintenance on your side.

Source distribution

Installations in CVMFS

Standalone installations with minimal external dependencies are available at:

/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.00/arm64-mac157-clang170-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.00/x86_64-almalinux10.1-gcc143-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.00/x86_64-almalinux8.10-gcc85-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.00/x86_64-almalinux9.7-gcc115-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.00/x86_64-debian13-gcc142-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.00/x86_64-fedora42-gcc152-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.00/x86_64-fedora43-gcc152-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.00/x86_64-ubuntu22.04-gcc114-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.00/x86_64-ubuntu24.04-gcc133-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.00/x86_64-ubuntu25.10-gcc152-opt

Git

The entire ROOT source can be obtained from our public Git repository:

git clone https://github.com/root-project/root.git

The release specific tag can be obtained using:

cd root
git checkout -b v6-38-00 v6-38-00

See instructions to build from source.

Windows

Windows 10/7/… are supported. We offer two packaging types:

• exe: a regular Windows installer package also setting up the required environment variables. With uninstall via “Control Panel” / “Add or Remove Programs”. Simply download and start. You can double-click ROOT to run it; ROOT files get registered with Windows.
• tar: unpack e.g. with 7zip. Start ROOT in a Microsoft Visual Studio Prompt (in Start / Programs / Microsoft Visual Studio / Tools). If you installed ROOT to C:\root then call C:\root\bin\thisroot.bat before using ROOT to set up required environment variables. Call instead thisroot.ps1 if you run from a powershell (the default terminal in Visual Studio Code).

Important installation notes

• You must download the binary built with the exact same version of Visual Studio (and Python) than the one installed on your system.
• Don’t forget to select the component “Desktop development with C++” when running the Visual Studio Installer.
• Do not untar in a directory with a name containing blank characters.
• Take the release version if performance matters.
• If you want to debug your code you need the ROOT debug build (you cannot mix release / debug builds due to a Microsoft restriction).

This release is an opportunity to try out the new functionalities of the 6.38.00 development release, currently scheduled by the end of November. The new ROOT comes with many new features (see the preliminary release notes) as well as improved stability: more than 240 items in the ROOT trackers have been addressed for this release. The release notes for this release can be found here.

Binary distributions

Instead of manually downloading this binary, please explore first whether your package manager already provides this version. This way, you will automatically keep up-to-date with the latest stable versions with no manual maintenance on your side.

Source distribution

Installations in CVMFS

Standalone installations with minimal external dependencies are available at:

/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.00-rc1/arm64-mac157-clang170-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.00-rc1/arm64-mac261-clang170-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.00-rc1/x86_64-almalinux10.0-gcc142-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.00-rc1/x86_64-almalinux8.10-gcc85-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.00-rc1/x86_64-almalinux9.6-gcc115-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.00-rc1/x86_64-debian13-gcc142-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.00-rc1/x86_64-fedora42-gcc152-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.00-rc1/x86_64-fedora43-gcc152-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.00-rc1/x86_64-mac148-clang160-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.00-rc1/x86_64-ubuntu22.04-gcc114-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.00-rc1/x86_64-ubuntu24.04-gcc133-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.00-rc1/x86_64-ubuntu25.04-gcc142-opt

Git

The entire ROOT source can be obtained from our public Git repository:

git clone https://github.com/root-project/root.git

The release specific tag can be obtained using:

cd root
git checkout -b v6-38-00-rc1 v6-38-00-rc1

See instructions to build from source.

Windows

Windows 10/7/… are supported. We offer two packaging types:

• exe: a regular Windows installer package also setting up the required environment variables. With uninstall via “Control Panel” / “Add or Remove Programs”. Simply download and start. You can double-click ROOT to run it; ROOT files get registered with Windows.
• tar: unpack e.g. with 7zip. Start ROOT in a Microsoft Visual Studio Prompt (in Start / Programs / Microsoft Visual Studio / Tools). If you installed ROOT to C:\root then call C:\root\bin\thisroot.bat before using ROOT to set up required environment variables. Call instead thisroot.ps1 if you run from a powershell (the default terminal in Visual Studio Code).

Important installation notes

• You must download the binary built with the exact same version of Visual Studio (and Python) than the one installed on your system.
• Don’t forget to select the component “Desktop development with C++” when running the Visual Studio Installer.
• Do not untar in a directory with a name containing blank characters.
• Take the release version if performance matters.
• If you want to debug your code you need the ROOT debug build (you cannot mix release / debug builds due to a Microsoft restriction).

The release notes for this release can be found here.

Binary distributions

Instead of manually downloading this binary, please explore first whether your package manager already provides this version. This way, you will automatically keep up-to-date with the latest stable versions with no manual maintenance on your side.

Source distribution

Installations in CVMFS

Standalone installations with minimal external dependencies are available at:

/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.14/arm64-mac265-clang210-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.14/x86_64-almalinux10.2-gcc143-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.14/x86_64-almalinux8.10-gcc85-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.14/x86_64-almalinux9.8-gcc115-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.14/x86_64-debian12-gcc122-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.14/x86_64-mac148-clang160-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.14/x86_64-ubuntu22.04-gcc114-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.14/x86_64-ubuntu24.04-gcc133-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.14/x86_64-ubuntu26.04-gcc152-opt

Git

The entire ROOT source can be obtained from our public Git repository:

git clone https://github.com/root-project/root.git

The release specific tag can be obtained using:

cd root
git checkout -b v6-36-14 v6-36-14

See instructions to build from source.

Windows

Windows 10/7/… are supported. We offer two packaging types:

• exe: a regular Windows installer package also setting up the required environment variables. With uninstall via “Control Panel” / “Add or Remove Programs”. Simply download and start. You can double-click ROOT to run it; ROOT files get registered with Windows.
• tar: unpack e.g. with 7zip. Start ROOT in a Microsoft Visual Studio Prompt (in Start / Programs / Microsoft Visual Studio / Tools). If you installed ROOT to C:\root then call C:\root\bin\thisroot.bat before using ROOT to set up required environment variables. Call instead thisroot.ps1 if you run from a powershell (the default terminal in Visual Studio Code).

Important installation notes

• You must download the binary built with the exact same version of Visual Studio (and Python) than the one installed on your system.
• Don’t forget to select the component “Desktop development with C++” when running the Visual Studio Installer.
• Do not untar in a directory with a name containing blank characters.
• Take the release version if performance matters.
• If you want to debug your code you need the ROOT debug build (you cannot mix release / debug builds due to a Microsoft restriction).

The release notes for this release can be found here.

Binary distributions

Instead of manually downloading this binary, please explore first whether your package manager already provides this version. This way, you will automatically keep up-to-date with the latest stable versions with no manual maintenance on your side.

Source distribution

Installations in CVMFS

Standalone installations with minimal external dependencies are available at:

/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.12/arm64-mac157-clang170-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.12/arm64-mac264-clang210-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.12/x86_64-almalinux8.10-gcc85-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.12/x86_64-almalinux9.7-gcc115-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.12/x86_64-debian12-gcc122-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.12/x86_64-fedora42-gcc152-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.12/x86_64-mac148-clang160-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.12/x86_64-ubuntu22.04-gcc114-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.12/x86_64-ubuntu24.04-gcc133-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.12/x86_64-ubuntu26.04-gcc152-opt

Git

The entire ROOT source can be obtained from our public Git repository:

git clone https://github.com/root-project/root.git

The release specific tag can be obtained using:

cd root
git checkout -b v6-36-12 v6-36-12

See instructions to build from source.

Windows

Windows 10/7/… are supported. We offer two packaging types:

• exe: a regular Windows installer package also setting up the required environment variables. With uninstall via “Control Panel” / “Add or Remove Programs”. Simply download and start. You can double-click ROOT to run it; ROOT files get registered with Windows.
• tar: unpack e.g. with 7zip. Start ROOT in a Microsoft Visual Studio Prompt (in Start / Programs / Microsoft Visual Studio / Tools). If you installed ROOT to C:\root then call C:\root\bin\thisroot.bat before using ROOT to set up required environment variables. Call instead thisroot.ps1 if you run from a powershell (the default terminal in Visual Studio Code).

Important installation notes

• You must download the binary built with the exact same version of Visual Studio (and Python) than the one installed on your system.
• Don’t forget to select the component “Desktop development with C++” when running the Visual Studio Installer.
• Do not untar in a directory with a name containing blank characters.
• Take the release version if performance matters.
• If you want to debug your code you need the ROOT debug build (you cannot mix release / debug builds due to a Microsoft restriction).

Release Notes

The release notes for this release can be found here.

Binary distributions

Instead of manually downloading this binary, please explore first whether your package manager already provides this version. This way, you will automatically keep up-to-date with the latest stable versions with no manual maintenance on your side.

Source distribution

Installations in CVMFS

Standalone installations with minimal external dependencies are available at:

/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.10/arm64-mac263-clang170-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.10/x86_64-almalinux10.1-gcc143-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.10/x86_64-almalinux8.10-gcc85-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.10/x86_64-almalinux9.7-gcc115-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.10/x86_64-debian12-gcc122-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.10/x86_64-fedora42-gcc152-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.10/x86_64-mac148-clang160-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.10/x86_64-ubuntu22.04-gcc114-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.10/x86_64-ubuntu24.04-gcc133-opt

Git

The entire ROOT source can be obtained from our public Git repository:

git clone https://github.com/root-project/root.git

The release specific tag can be obtained using:

cd root
git checkout -b v6-36-10 v6-36-10

See instructions to build from source.

Windows

Windows 10/7/… are supported. We offer two packaging types:

• exe: a regular Windows installer package also setting up the required environment variables. With uninstall via “Control Panel” / “Add or Remove Programs”. Simply download and start. You can double-click ROOT to run it; ROOT files get registered with Windows.
• tar: unpack e.g. with 7zip. Start ROOT in a Microsoft Visual Studio Prompt (in Start / Programs / Microsoft Visual Studio / Tools). If you installed ROOT to C:\root then call C:\root\bin\thisroot.bat before using ROOT to set up required environment variables. Call instead thisroot.ps1 if you run from a powershell (the default terminal in Visual Studio Code).

Important installation notes

• You must download the binary built with the exact same version of Visual Studio (and Python) than the one installed on your system.
• Don’t forget to select the component “Desktop development with C++” when running the Visual Studio Installer.
• Do not untar in a directory with a name containing blank characters.
• Take the release version if performance matters.
• If you want to debug your code you need the ROOT debug build (you cannot mix release / debug builds due to a Microsoft restriction).

A patch of the 6.36 series. The release notes for this release can be found here.

Binary distributions

Instead of manually downloading this binary, please explore first whether your package manager already provides this version. This way, you will automatically keep up-to-date with the latest stable versions with no manual maintenance on your side.

Source distribution

Installations in CVMFS

Standalone installations with minimal external dependencies are available at:

/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.08/arm64-mac157-clang170-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.08/arm64-mac262-clang170-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.08/x86_64-almalinux10.1-gcc143-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.08/x86_64-almalinux8.10-gcc85-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.08/x86_64-almalinux9.7-gcc115-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.08/x86_64-debian12-gcc122-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.08/x86_64-fedora42-gcc152-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.08/x86_64-ubuntu22.04-gcc114-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.08/x86_64-ubuntu24.04-gcc133-opt

Git

The entire ROOT source can be obtained from our public Git repository:

git clone https://github.com/root-project/root.git

The release specific tag can be obtained using:

cd root
git checkout -b v6-36-08 v6-36-08

See instructions to build from source.

Windows

Windows 10/7/… are supported. We offer two packaging types:

• exe: a regular Windows installer package also setting up the required environment variables. With uninstall via “Control Panel” / “Add or Remove Programs”. Simply download and start. You can double-click ROOT to run it; ROOT files get registered with Windows.
• tar: unpack e.g. with 7zip. Start ROOT in a Microsoft Visual Studio Prompt (in Start / Programs / Microsoft Visual Studio / Tools). If you installed ROOT to C:\root then call C:\root\bin\thisroot.bat before using ROOT to set up required environment variables. Call instead thisroot.ps1 if you run from a powershell (the default terminal in Visual Studio Code).

Important installation notes

• You must download the binary built with the exact same version of Visual Studio (and Python) than the one installed on your system.
• Don’t forget to select the component “Desktop development with C++” when running the Visual Studio Installer.
• Do not untar in a directory with a name containing blank characters.
• Take the release version if performance matters.
• If you want to debug your code you need the ROOT debug build (you cannot mix release / debug builds due to a Microsoft restriction).

For this release, we addressed a few items which were pending for 6.36.04. Support for the new Apple XCode 26.2 was added. The release notes for this release can be found here.

Binary distributions

Instead of manually downloading this binary, please explore first whether your package manager already provides this version. This way, you will automatically keep up-to-date with the latest stable versions with no manual maintenance on your side.

Source distribution

Installations in CVMFS

Standalone installations with minimal external dependencies are available at:

/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.06/arm64-mac157-clang170-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.06/arm64-mac261-clang170-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.06/x86_64-almalinux10.1-gcc143-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.06/x86_64-almalinux8.10-gcc85-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.06/x86_64-almalinux9.6-gcc115-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.06/x86_64-fedora42-gcc152-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.06/x86_64-ubuntu22.04-gcc114-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.06/x86_64-ubuntu24.04-gcc133-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.06/x86_64-ubuntu25.04-gcc142-opt

Git

The entire ROOT source can be obtained from our public Git repository:

git clone https://github.com/root-project/root.git

The release specific tag can be obtained using:

cd root
git checkout -b v6-36-06 v6-36-06

See instructions to build from source.

Windows

Windows 10/7/… are supported. We offer two packaging types:

• exe: a regular Windows installer package also setting up the required environment variables. With uninstall via “Control Panel” / “Add or Remove Programs”. Simply download and start. You can double-click ROOT to run it; ROOT files get registered with Windows.
• tar: unpack e.g. with 7zip. Start ROOT in a Microsoft Visual Studio Prompt (in Start / Programs / Microsoft Visual Studio / Tools). If you installed ROOT to C:\root then call C:\root\bin\thisroot.bat before using ROOT to set up required environment variables. Call instead thisroot.ps1 if you run from a powershell (the default terminal in Visual Studio Code).

Important installation notes

• You must download the binary built with the exact same version of Visual Studio (and Python) than the one installed on your system.
• Don’t forget to select the component “Desktop development with C++” when running the Visual Studio Installer.
• Do not untar in a directory with a name containing blank characters.
• Take the release version if performance matters.
• If you want to debug your code you need the ROOT debug build (you cannot mix release / debug builds due to a Microsoft restriction).

The release notes for this release can be found here.

Binary distributions

Instead of manually downloading this binary, please explore first whether your package manager already provides this version. This way, you will automatically keep up-to-date with the latest stable versions with no manual maintenance on your side.

Source distribution

Installations in CVMFS

Standalone installations with minimal external dependencies are available at:

/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.04/arm64-mac156-clang170-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.04/x86_64-almalinux10.0-gcc142-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.04/x86_64-almalinux8.10-gcc85-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.04/x86_64-almalinux9.6-gcc115-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.04/x86_64-debian12-gcc122-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.04/x86_64-fedora41-gcc143-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.04/x86_64-fedora42-gcc152-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.04/x86_64-mac147-clang160-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.04/x86_64-ubuntu22.04-gcc114-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.04/x86_64-ubuntu24.04-gcc133-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.04/x86_64-ubuntu25.04-gcc142-opt

Git

The entire ROOT source can be obtained from our public Git repository:

git clone https://github.com/root-project/root.git

The release specific tag can be obtained using:

cd root
git checkout -b v6-36-04 v6-36-04

See instructions to build from source.

Windows

Windows 10/7/… are supported. We offer two packaging types:

• exe: a regular Windows installer package also setting up the required environment variables. With uninstall via “Control Panel” / “Add or Remove Programs”. Simply download and start. You can double-click ROOT to run it; ROOT files get registered with Windows.
• tar: unpack e.g. with 7zip. Start ROOT in a Microsoft Visual Studio Prompt (in Start / Programs / Microsoft Visual Studio / Tools). If you installed ROOT to C:\root then call C:\root\bin\thisroot.bat before using ROOT to set up required environment variables. Call instead thisroot.ps1 if you run from a powershell (the default terminal in Visual Studio Code).

Important installation notes

• You must download the binary built with the exact same version of Visual Studio (and Python) than the one installed on your system.
• Don’t forget to select the component “Desktop development with C++” when running the Visual Studio Installer.
• Do not untar in a directory with a name containing blank characters.
• Take the release version if performance matters.
• If you want to debug your code you need the ROOT debug build (you cannot mix release / debug builds due to a Microsoft restriction).

The release notes for this release can be found here.

Binary distributions

Instead of manually downloading this binary, please explore first whether your package manager already provides this version. This way, you will automatically keep up-to-date with the latest stable versions with no manual maintenance on your side.

Source distribution

Installations in CVMFS

Standalone installations with minimal external dependencies are available at:

/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.02/arm64-mac155-clang170-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.02/x86_64-almalinux10.0-gcc142-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.02/x86_64-almalinux8.10-gcc85-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.02/x86_64-almalinux9.6-gcc115-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.02/x86_64-debian12-gcc122-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.02/x86_64-fedora41-gcc143-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.02/x86_64-fedora42-gcc151-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.02/x86_64-ubuntu22.04-gcc114-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.02/x86_64-ubuntu24.04-gcc133-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.02/x86_64-ubuntu25.04-gcc142-opt

Git

The entire ROOT source can be obtained from our public Git repository:

git clone https://github.com/root-project/root.git

The release specific tag can be obtained using:

cd root
git checkout -b v6-36-02 v6-36-02

See instructions to build from source.

Windows

Windows 10/7/… are supported. We offer two packaging types:

• exe: a regular Windows installer package also setting up the required environment variables. With uninstall via “Control Panel” / “Add or Remove Programs”. Simply download and start. You can double-click ROOT to run it; ROOT files get registered with Windows.
• tar: unpack e.g. with 7zip. Start ROOT in a Microsoft Visual Studio Prompt (in Start / Programs / Microsoft Visual Studio / Tools). If you installed ROOT to C:\root then call C:\root\bin\thisroot.bat before using ROOT to set up required environment variables. Call instead thisroot.ps1 if you run from a powershell (the default terminal in Visual Studio Code).

Important installation notes

• You must download the binary built with the exact same version of Visual Studio (and Python) than the one installed on your system.
• Don’t forget to select the component “Desktop development with C++” when running the Visual Studio Installer.
• Do not untar in a directory with a name containing blank characters.
• Take the release version if performance matters.
• If you want to debug your code you need the ROOT debug build (you cannot mix release / debug builds due to a Microsoft restriction).

The release notes for this release can be found here.

Highlights:

🐍 Python Interface

• Unified Histogram Interface (UHI): ROOT histograms now implement UHI ,enhancing interoperability with external python libraries for plotting and enabling pythonic indexing and slicing for histogram manipulation - see the doc here!
• The interoperability of ROOT and NumPy arrays was enhanced in many areas.

💾 RNTuple

• The RNTuple core API moved from experimental to production, out of the Experimental namespace, and the RNTuple libraries are now always built with ROOT (i.e., no need to explicitly enable the root7 build option anymore). User code using the production API will now benefit from ROOT’s regular API stability.
• Production classes include the RNTupleReader and RNTupleWriter, and associated classes. Some advanced classes, such as the RNTupleParallelWriter, will be moved to production in a later release.

📚 Documentation

• A veritable Tutorials Renovation Campaign took place: it is now more intuitive to navigate through the individual parts of the ROOT tutorials, our collection of code examples. Some tutorials were added to showcase the new features, some were modernized to modern C++ standards and some were moved to the legacy folder.

📈 RDataFrame

• Local and distributed APIs are now made uniform, and the distributed RDataFrame module is out of the Experimental namespace 🥳
• RNTuple processing has been improved with automatic conversion of collection types to the ergonomic ROOT::RVec, and you can now save the modified RNTuple with Snapshot
• Many improvements to the well-known RDataFrame functionalities were added, including parsing of CSV files, Display, Report, AsNumpy, reading pandas dataframes and numpy arrays.

📊 RooFit

• Creating HistFactory models from many histograms is up to an order of magnitude faster. In an ATLAS example, the workspace creation time went from 15 minutes to 1:30 minutes!
• Automatic differentiation, powered by Clad, is transparently available to users, providing improved numerical stability as well as much more runtime performance.

🧑‍💻 C++ Interpreter

• Existing code can now be interpreted and just-in-time compiled according to the C++23 standard for the platforms that support it.

As previously announced, the 6.36 cycle supersedes the STS 6.34 one, which will be stopped in June.

Binary distributions

Instead of manually downloading this binary, please explore first whether your package manager already provides this version. This way, you will automatically keep up-to-date with the latest stable versions with no manual maintenance on your side.

Source distribution

Installations in CVMFS

Standalone installations with minimal external dependencies are available at:

/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.00/arm64-mac155-clang170-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.00/x86_64-almalinux8.10-gcc85-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.00/x86_64-almalinux9.5-gcc115-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.00/x86_64-debian12-gcc122-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.00/x86_64-fedora41-gcc142-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.00/x86_64-fedora42-gcc151-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.00/x86_64-mac147-clang160-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.00/x86_64-ubuntu22.04-gcc114-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.00/x86_64-ubuntu24.04-gcc133-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.00/x86_64-ubuntu25.04-gcc142-opt

Git

The entire ROOT source can be obtained from our public Git repository:

git clone https://github.com/root-project/root.git

The release specific tag can be obtained using:

cd root
git checkout -b v6-36-00 v6-36-00

See instructions to build from source.

Windows

Windows 10/7/… are supported. We offer two packaging types:

• exe: a regular Windows installer package also setting up the required environment variables. With uninstall via “Control Panel” / “Add or Remove Programs”. Simply download and start. You can double-click ROOT to run it; ROOT files get registered with Windows.
• tar: unpack e.g. with 7zip. Start ROOT in a Microsoft Visual Studio Prompt (in Start / Programs / Microsoft Visual Studio / Tools). If you installed ROOT to C:\root then call C:\root\bin\thisroot.bat before using ROOT to set up required environment variables. Call instead thisroot.ps1 if you run from a powershell (the default terminal in Visual Studio Code).

Important installation notes

• You must download the binary built with the exact same version of Visual Studio (and Python) than the one installed on your system.
• Don’t forget to select the component “Desktop development with C++” when running the Visual Studio Installer.
• Do not untar in a directory with a name containing blank characters.
• Take the release version if performance matters.
• If you want to debug your code you need the ROOT debug build (you cannot mix release / debug builds due to a Microsoft restriction).

The release notes for this release can be found here.

Binary distributions

Instead of manually downloading this binary, please explore first whether your package manager already provides this version. This way, you will automatically keep up-to-date with the latest stable versions with no manual maintenance on your side.

Source distribution

Installations in CVMFS

Standalone installations with minimal external dependencies are available at:

/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.00-rc1/root
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.00-rc1/x86_64-almalinux8.10-gcc85-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.00-rc1/x86_64-almalinux9.5-gcc115-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.00-rc1/x86_64-debian12-gcc122-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.00-rc1/x86_64-fedora41-gcc142-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.00-rc1/x86_64-fedora42-gcc150-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.00-rc1/x86_64-ubuntu22.04-gcc114-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.00-rc1/x86_64-ubuntu24.04-gcc133-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.36.00-rc1/x86_64-ubuntu25.04-gcc142-opt

Git

The entire ROOT source can be obtained from our public Git repository:

git clone https://github.com/root-project/root.git

The release specific tag can be obtained using:

cd root
git checkout -b v6-36-00-rc1 v6-36-00-rc1

See instructions to build from source.

Windows

Windows 10/7/… are supported. We offer two packaging types:

• exe: a regular Windows installer package also setting up the required environment variables. With uninstall via “Control Panel” / “Add or Remove Programs”. Simply download and start. You can double-click ROOT to run it; ROOT files get registered with Windows.
• tar: unpack e.g. with 7zip. Start ROOT in a Microsoft Visual Studio Prompt (in Start / Programs / Microsoft Visual Studio / Tools). If you installed ROOT to C:\root then call C:\root\bin\thisroot.bat before using ROOT to set up required environment variables. Call instead thisroot.ps1 if you run from a powershell (the default terminal in Visual Studio Code).

Important installation notes

• You must download the binary built with the exact same version of Visual Studio (and Python) than the one installed on your system.
• Don’t forget to select the component “Desktop development with C++” when running the Visual Studio Installer.
• Do not untar in a directory with a name containing blank characters.
• Take the release version if performance matters.
• If you want to debug your code you need the ROOT debug build (you cannot mix release / debug builds due to a Microsoft restriction).

The release notes for this release can be found here.

Binary distributions

Instead of manually downloading this binary, please explore first whether your package manager already provides this version. This way, you will automatically keep up-to-date with the latest stable versions with no manual maintenance on your side.

Source distribution

Installations in CVMFS

Standalone installations with minimal external dependencies are available at:

/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.34.10/arm64-mac155-clang170-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.34.10/x86_64-almalinux10.0-gcc142-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.34.10/x86_64-almalinux8.10-gcc85-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.34.10/x86_64-almalinux9.6-gcc115-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.34.10/x86_64-debian12-gcc122-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.34.10/x86_64-fedora41-gcc143-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.34.10/x86_64-ubuntu22.04-gcc114-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.34.10/x86_64-ubuntu24.04-gcc133-opt

Git

The entire ROOT source can be obtained from our public Git repository:

git clone https://github.com/root-project/root.git

The release specific tag can be obtained using:

cd root
git checkout -b v6-34-10 v6-34-10

See instructions to build from source.

Windows

Windows 10/7/… are supported. We offer two packaging types:

• exe: a regular Windows installer package also setting up the required environment variables. With uninstall via “Control Panel” / “Add or Remove Programs”. Simply download and start. You can double-click ROOT to run it; ROOT files get registered with Windows.
• tar: unpack e.g. with 7zip. Start ROOT in a Microsoft Visual Studio Prompt (in Start / Programs / Microsoft Visual Studio / Tools). If you installed ROOT to C:\root then call C:\root\bin\thisroot.bat before using ROOT to set up required environment variables. Call instead thisroot.ps1 if you run from a powershell (the default terminal in Visual Studio Code).

Important installation notes

• You must download the binary built with the exact same version of Visual Studio (and Python) than the one installed on your system.
• Don’t forget to select the component “Desktop development with C++” when running the Visual Studio Installer.
• Do not untar in a directory with a name containing blank characters.
• Take the release version if performance matters.
• If you want to debug your code you need the ROOT debug build (you cannot mix release / debug builds due to a Microsoft restriction).

The release notes for this release can be found here. Please find this release also on GitHub here.

Binary distributions

Instead of manually downloading this binary, please explore first whether your package manager already provides this version. This way, you will automatically keep up-to-date with the latest stable versions with no manual maintenance on your side.

Source distribution

Installations in CVMFS

Standalone installations with minimal external dependencies are available at:

/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.34.08/root
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.34.08/x86_64-almalinux8.10-gcc85-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.34.08/x86_64-almalinux9.5-gcc115-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.34.08/x86_64-debian12-gcc122-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.34.08/x86_64-fedora40-gcc142-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.34.08/x86_64-fedora41-gcc142-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.34.08/x86_64-mac147-clang160-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.34.08/x86_64-ubuntu20.04-gcc94-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.34.08/x86_64-ubuntu22.04-gcc114-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.34.08/x86_64-ubuntu24.04-gcc133-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.34.08/x86_64-ubuntu24.10-gcc142-opt

Git

The entire ROOT source can be obtained from our public Git repository:

git clone https://github.com/root-project/root.git

The release specific tag can be obtained using:

cd root
git checkout -b v6-34-08 v6-34-08

See instructions to build from source.

Windows

Windows 10/7/… are supported. We offer two packaging types:

• exe: a regular Windows installer package also setting up the required environment variables. With uninstall via “Control Panel” / “Add or Remove Programs”. Simply download and start. You can double-click ROOT to run it; ROOT files get registered with Windows.
• tar: unpack e.g. with 7zip. Start ROOT in a Microsoft Visual Studio Prompt (in Start / Programs / Microsoft Visual Studio / Tools). If you installed ROOT to C:\root then call C:\root\bin\thisroot.bat before using ROOT to set up required environment variables. Call instead thisroot.ps1 if you run from a powershell (the default terminal in Visual Studio Code).

Important installation notes

• You must download the binary built with the exact same version of Visual Studio (and Python) than the one installed on your system.
• Don’t forget to select the component “Desktop development with C++” when running the Visual Studio Installer.
• Do not untar in a directory with a name containing blank characters.
• Take the release version if performance matters.
• If you want to debug your code you need the ROOT debug build (you cannot mix release / debug builds due to a Microsoft restriction).

The release notes for this release can be found here. Please find this release also on GitHub here.

Binary distributions

Instead of manually downloading this binary, please explore first whether your package manager already provides this version. This way, you will automatically keep up-to-date with the latest stable versions with no manual maintenance on your side.

Source distribution

Installations in CVMFS

Standalone installations with minimal external dependencies are available at:

/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.34.06/root
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.34.06/x86_64-almalinux8.10-gcc85-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.34.06/x86_64-almalinux9.5-gcc115-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.34.06/x86_64-debian12-gcc122-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.34.06/x86_64-fedora40-gcc142-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.34.06/x86_64-fedora41-gcc142-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.34.06/x86_64-mac147-clang160-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.34.06/x86_64-ubuntu20.04-gcc94-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.34.06/x86_64-ubuntu22.04-gcc114-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.34.06/x86_64-ubuntu24.04-gcc133-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.34.06/x86_64-ubuntu24.10-gcc142-opt

Git

The entire ROOT source can be obtained from our public Git repository:

git clone https://github.com/root-project/root.git

The release specific tag can be obtained using:

cd root
git checkout -b v6-34-06 v6-34-06

See instructions to build from source.

Windows

Windows 10/7/… are supported. We offer two packaging types:

• exe: a regular Windows installer package also setting up the required environment variables. With uninstall via “Control Panel” / “Add or Remove Programs”. Simply download and start. You can double-click ROOT to run it; ROOT files get registered with Windows.
• tar: unpack e.g. with 7zip. Start ROOT in a Microsoft Visual Studio Prompt (in Start / Programs / Microsoft Visual Studio / Tools). If you installed ROOT to C:\root then call C:\root\bin\thisroot.bat before using ROOT to set up required environment variables. Call instead thisroot.ps1 if you run from a powershell (the default terminal in Visual Studio Code).

Important installation notes

• You must download the binary built with the exact same version of Visual Studio (and Python) than the one installed on your system.
• Don’t forget to select the component “Desktop development with C++” when running the Visual Studio Installer.
• Do not untar in a directory with a name containing blank characters.
• Take the release version if performance matters.
• If you want to debug your code you need the ROOT debug build (you cannot mix release / debug builds due to a Microsoft restriction).