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‎_releases/release-63612.md‎

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layout: releases
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version: 6.36.12
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release_date: 2026-04-27
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‎_releases/release-64000.md‎

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---
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layout: releases
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version: 6.40.00
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release_date: 2026-05-20
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state: latest
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toc: true
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toc_sticky: true
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sidebar:
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nav: "releases"
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---
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## Release Notes
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The full release notes for this release can be found [here](https://root.cern/doc/v640/release-notes.html#release-6.40.00).
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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.
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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](https://root.cern/doc/v640/release-notes.html#items-addressed-for-this-release)). Dive into the full [release notes](https://root.cern/doc/v640/release-notes.html) and explore the highlights below!
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🔓**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](https://root.cern.ch/doc/master/namespaceROOT_1_1Experimental.html#a74fae8f88965b8c79dfbd25bebbce3a4).
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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](https://root.cern/doc/v640/group__tutorial__histv7.html)!
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🤖 **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.
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I/O Experience a brand-new, streamlined HTTP I/O implementation powered by [libcurl](https://curl.se/libcurl/)! This update delivers modern remote read capabilities, including advanced compression, secure transport, and S3 support, all across 🐧🍎🪟.
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🔀 **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!
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🌳 **Ready to evolve beyond TTree::Draw?** We’ve provided a comprehensive [Rosetta Stone](https://root.cern/doc/master/classROOT_1_1RDataFrame.html#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.
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🚀 **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!
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📦 **Builtins** We’ve dramatically streamlined our codebase. The builtin package footprints have been [slashed by a factor of 4x](https://root.cern/doc/v640/release-notes.html#moving-from-builtin-dependencies-to-system-provided-packages). This makes ROOT lighter and faster to build than ever, while pivoting toward a robust reliance on high-performance system packages.
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## Binary distributions
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Instead of manually downloading this binary, please explore first whether your [package manager](../../install/#install-via-a-package-manager){:target="\_blank"} already provides this version.
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This way, you will automatically keep up-to-date with the latest stable versions with no manual maintenance on your side.
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| Platform | Files | Size |
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|-----------|-------|-----|
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| Almalinux 8.10 | [root_v6.40.00-rc1.Linux-almalinux8.10-x86_64-gcc8.5.tar.gz](https://root.cern/download/root_v6.40.00-rc1.Linux-almalinux8.10-x86_64-gcc8.5.tar.gz) | 294M |
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| Almalinux 9.7 | [root_v6.40.00-rc1.Linux-almalinux9.7-x86_64-gcc11.5.tar.gz](https://root.cern/download/root_v6.40.00-rc1.Linux-almalinux9.7-x86_64-gcc11.5.tar.gz) | 317M |
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| Almalinux 10.1 | [root_v6.40.00-rc1.Linux-almalinux10.1-x86_64-gcc14.3.tar.gz](https://root.cern/download/root_v6.40.00-rc1.Linux-almalinux10.1-x86_64-gcc14.3.tar.gz) | 323M |
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| Debian 13 | [root_v6.40.00-rc1.Linux-debian13-x86_64-gcc14.2.tar.gz](https://root.cern/download/root_v6.40.00-rc1.Linux-debian13-x86_64-gcc14.2.tar.gz) | 325M |
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| Fedora 43 | [root_v6.40.00-rc1.Linux-fedora43-x86_64-gcc15.2.tar.gz](https://root.cern/download/root_v6.40.00-rc1.Linux-fedora43-x86_64-gcc15.2.tar.gz) | 368M |
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| Fedora 44 | [root_v6.40.00-rc1.Linux-fedora44-x86_64-gcc16.0.tar.gz](https://root.cern/download/root_v6.40.00-rc1.Linux-fedora44-x86_64-gcc16.0.tar.gz) | 372M |
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| Ubuntu 22.04 | [root_v6.40.00-rc1.Linux-ubuntu22.04-x86_64-gcc11.4.tar.gz](https://root.cern/download/root_v6.40.00-rc1.Linux-ubuntu22.04-x86_64-gcc11.4.tar.gz) | 306M |
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| Ubuntu 24.04 | [root_v6.40.00-rc1.Linux-ubuntu24.04-x86_64-gcc13.3.tar.gz](https://root.cern/download/root_v6.40.00-rc1.Linux-ubuntu24.04-x86_64-gcc13.3.tar.gz) | 323M |
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| Ubuntu 26.04 | [root_v6.40.00-rc1.Linux-ubuntu26.04-x86_64-gcc15.2.tar.gz](https://root.cern/download/root_v6.40.00-rc1.Linux-ubuntu26.04-x86_64-gcc15.2.tar.gz) | 327M |
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| macOS 14.8 x86_64 Xcode 16 | [root_v6.40.00-rc1.macos-14.8-x86_64-clang160.pkg](https://root.cern/download/root_v6.40.00-rc1.macos-14.8-x86_64-clang160.pkg) | 477M |
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| macOS 14.8 x86_64 Xcode 16 | [root_v6.40.00-rc1.macos-14.8-x86_64-clang160.tar.gz](https://root.cern/download/root_v6.40.00-rc1.macos-14.8-x86_64-clang160.tar.gz) | 312M |
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| macOS 15.7 arm64 Xcode 17 | [root_v6.40.00-rc1.macos-15.7-arm64-clang170.pkg](https://root.cern/download/root_v6.40.00-rc1.macos-15.7-arm64-clang170.pkg) | 464M |
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| macOS 15.7 arm64 Xcode 17 | [root_v6.40.00-rc1.macos-15.7-arm64-clang170.tar.gz](https://root.cern/download/root_v6.40.00-rc1.macos-15.7-arm64-clang170.tar.gz) | 308M |
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| macOS 26.4 arm64 Xcode 21 | [root_v6.40.00-rc1.macos-26.4-arm64-clang210.pkg](https://root.cern/download/root_v6.40.00-rc1.macos-26.4-arm64-clang210.pkg) | 479M |
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| macOS 26.4 arm64 Xcode 21 | [root_v6.40.00-rc1.macos-26.4-arm64-clang210.tar.gz](https://root.cern/download/root_v6.40.00-rc1.macos-26.4-arm64-clang210.tar.gz) | 320M |
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| Windows Visual Studio 2025 32-bit x86 | [root_v6.40.00-rc1.win32.python314.vc18.exe](https://root.cern/download/root_v6.40.00-rc1.win32.python314.vc18.exe) | 152M |
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| Windows Visual Studio 2025 32-bit x86 | [root_v6.40.00-rc1.win32.python314.vc18.zip](https://root.cern/download/root_v6.40.00-rc1.win32.python314.vc18.zip) | 213M |
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| Windows Visual Studio 2022 64-bit x64 | [root_v6.40.00-rc1.win64.python311.vc17.exe](https://root.cern/download/root_v6.40.00-rc1.win64.python311.vc17.exe) | 137M |
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| Windows Visual Studio 2022 64-bit x64 | [root_v6.40.00-rc1.win64.python311.vc17.zip](https://root.cern/download/root_v6.40.00-rc1.win64.python311.vc17.zip) | 188M |
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| Windows Visual Studio 2025 64-bit x64 (release with debugging information) | [root_v6.40.00-rc1.win64.python314.vc18.relwithdebinfo.exe](https://root.cern/download/root_v6.40.00-rc1.win64.python314.vc18.relwithdebinfo.exe) | 447M |
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| Windows Visual Studio 2025 64-bit x64 (release with debugging information) | [root_v6.40.00-rc1.win64.python314.vc18.relwithdebinfo.zip](https://root.cern/download/root_v6.40.00-rc1.win64.python314.vc18.relwithdebinfo.zip) | 709M |
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| Almalinux 8.10 | [root_v6.40.00.Linux-almalinux8.10-x86_64-gcc8.5.tar.gz](https://root.cern/download/root_v6.40.00.Linux-almalinux8.10-x86_64-gcc8.5.tar.gz) | 294M |
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| Almalinux 9.7 | [root_v6.40.00.Linux-almalinux9.7-x86_64-gcc11.5.tar.gz](https://root.cern/download/root_v6.40.00.Linux-almalinux9.7-x86_64-gcc11.5.tar.gz) | 317M |
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| Almalinux 10.1 | [root_v6.40.00.Linux-almalinux10.1-x86_64-gcc14.3.tar.gz](https://root.cern/download/root_v6.40.00.Linux-almalinux10.1-x86_64-gcc14.3.tar.gz) | 323M |
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| Debian 13 | [root_v6.40.00.Linux-debian13-x86_64-gcc14.2.tar.gz](https://root.cern/download/root_v6.40.00.Linux-debian13-x86_64-gcc14.2.tar.gz) | 325M |
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| Fedora 43 | [root_v6.40.00.Linux-fedora43-x86_64-gcc15.2.tar.gz](https://root.cern/download/root_v6.40.00.Linux-fedora43-x86_64-gcc15.2.tar.gz) | 368M |
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| Fedora 44 | [root_v6.40.00.Linux-fedora44-x86_64-gcc16.1.tar.gz](https://root.cern/download/root_v6.40.00.Linux-fedora44-x86_64-gcc16.1.tar.gz) | 372M |
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| Ubuntu 22.04 | [root_v6.40.00.Linux-ubuntu22.04-x86_64-gcc11.4.tar.gz](https://root.cern/download/root_v6.40.00.Linux-ubuntu22.04-x86_64-gcc11.4.tar.gz) | 306M |
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| Ubuntu 24.04 | [root_v6.40.00.Linux-ubuntu24.04-x86_64-gcc13.3.tar.gz](https://root.cern/download/root_v6.40.00.Linux-ubuntu24.04-x86_64-gcc13.3.tar.gz) | 323M |
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| Ubuntu 26.04 | [root_v6.40.00.Linux-ubuntu26.04-x86_64-gcc15.2.tar.gz](https://root.cern/download/root_v6.40.00.Linux-ubuntu26.04-x86_64-gcc15.2.tar.gz) | 327M |
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| macOS 14.8 x86_64 Xcode 16 | [root_v6.40.00.macos-14.8-x86_64-clang160.pkg](https://root.cern/download/root_v6.40.00.macos-14.8-x86_64-clang160.pkg) | 477M |
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| macOS 14.8 x86_64 Xcode 16 | [root_v6.40.00.macos-14.8-x86_64-clang160.tar.gz](https://root.cern/download/root_v6.40.00.macos-14.8-x86_64-clang160.tar.gz) | 312M |
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| macOS 15.7 arm64 Xcode 17 | [root_v6.40.00.macos-15.7-arm64-clang170.pkg](https://root.cern/download/root_v6.40.00.macos-15.7-arm64-clang170.pkg) | 463M |
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| macOS 15.7 arm64 Xcode 17 | [root_v6.40.00.macos-15.7-arm64-clang170.tar.gz](https://root.cern/download/root_v6.40.00.macos-15.7-arm64-clang170.tar.gz) | 308M |
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| macOS 26.4 arm64 Xcode 21 | [root_v6.40.00.macos-26.4-arm64-clang210.pkg](https://root.cern/download/root_v6.40.00.macos-26.4-arm64-clang210.pkg) | 479M |
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| macOS 26.4 arm64 Xcode 21 | [root_v6.40.00.macos-26.4-arm64-clang210.tar.gz](https://root.cern/download/root_v6.40.00.macos-26.4-arm64-clang210.tar.gz) | 320M |
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| Windows Visual Studio 2022 32-bit x86 | [root_v6.40.00.win32.python311.vc17.exe](https://root.cern/download/root_v6.40.00.win32.python311.vc17.exe) | 132M |
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| Windows Visual Studio 2022 32-bit x86 (release with debugging information) | [root_v6.40.00.win32.python311.vc17.relwithdebinfo.exe](https://root.cern/download/root_v6.40.00.win32.python311.vc17.relwithdebinfo.exe) | 365M |
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| Windows Visual Studio 2022 32-bit x86 (release with debugging information) | [root_v6.40.00.win32.python311.vc17.relwithdebinfo.zip](https://root.cern/download/root_v6.40.00.win32.python311.vc17.relwithdebinfo.zip) | 575M |
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| Windows Visual Studio 2022 32-bit x86 | [root_v6.40.00.win32.python311.vc17.zip](https://root.cern/download/root_v6.40.00.win32.python311.vc17.zip) | 181M |
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| Windows Visual Studio 2022 64-bit x64 | [root_v6.40.00.win64.python311.vc17.exe](https://root.cern/download/root_v6.40.00.win64.python311.vc17.exe) | 137M |
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| Windows Visual Studio 2022 64-bit x64 | [root_v6.40.00.win64.python311.vc17.zip](https://root.cern/download/root_v6.40.00.win64.python311.vc17.zip) | 188M |
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| Windows Visual Studio 2025 64-bit x64 (release with debugging information) | [root_v6.40.00.win64.python314.vc18.relwithdebinfo.exe](https://root.cern/download/root_v6.40.00.win64.python314.vc18.relwithdebinfo.exe) | 447M |
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| Windows Visual Studio 2025 64-bit x64 (release with debugging information) | [root_v6.40.00.win64.python314.vc18.relwithdebinfo.zip](https://root.cern/download/root_v6.40.00.win64.python314.vc18.relwithdebinfo.zip) | 709M |
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## Source distribution
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| Platform | Files | Size |
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|-----------|-------|-----|
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| source | [root_v6.40.00.source.tar.gz](https://root.cern/download/root_v6.40.00.source.tar.gz) | 328M |
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## Installations in CVMFS
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Standalone installations with minimal external dependencies are available at:
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~~~
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/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.40.00/arm64-mac157-clang170-opt
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/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.40.00/arm64-mac264-clang210-opt
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/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.40.00/x86_64-almalinux10.1-gcc143-opt
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/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.40.00/x86_64-almalinux8.10-gcc85-opt
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/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.40.00/x86_64-almalinux9.7-gcc115-opt
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/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.40.00/x86_64-debian13-gcc142-opt
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/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.40.00/x86_64-fedora43-gcc152-opt
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/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.40.00/x86_64-fedora44-gcc161-opt
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/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.40.00/x86_64-mac148-clang160-opt
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/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.40.00/x86_64-ubuntu22.04-gcc114-opt
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/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.40.00/x86_64-ubuntu24.04-gcc133-opt
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/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.40.00/x86_64-ubuntu26.04-gcc152-opt
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~~~
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## Git
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The entire ROOT source can be obtained from our public Git repository:
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~~~
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git clone https://github.com/root-project/root.git
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~~~
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The release specific tag can be obtained using:
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~~~
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cd root
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git checkout -b v6-40-00 v6-40-00
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~~~
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See [instructions to build from source](../../install/#build-from-source){:target="\_blank"}.
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## Windows
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Windows 10/7/... are supported. We offer two packaging types:
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* **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.
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* **tar**: unpack e.g. with [7zip](https://www.7-zip.org). 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).
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### Important installation notes
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* You must download the binary built with the exact same version of Visual Studio (and Python) than the one installed on your system.
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* Don't forget to select the component “Desktop development with C++" when running the Visual Studio Installer.
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* Do not untar in a directory with a name containing blank characters.
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* Take the release version if performance matters.
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* If you want to debug your code you need the ROOT debug build (you cannot mix release / debug builds due to a Microsoft restriction).
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