Release 6.40.00-rc1 - 2026-04-23

This is the first release candidate for the 6.40.00 release (LTS), expected in May 2025.

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.

Platform Files Size
Almalinux 8.10 root_v6.40.00-rc1.Linux-almalinux8.10-x86_64-gcc8.5.tar.gz 294M
Almalinux 9.7 root_v6.40.00-rc1.Linux-almalinux9.7-x86_64-gcc11.5.tar.gz 317M
Almalinux 10.1 root_v6.40.00-rc1.Linux-almalinux10.1-x86_64-gcc14.3.tar.gz 323M
Debian 13 root_v6.40.00-rc1.Linux-debian13-x86_64-gcc14.2.tar.gz 325M
Fedora 43 root_v6.40.00-rc1.Linux-fedora43-x86_64-gcc15.2.tar.gz 368M
Fedora 44 root_v6.40.00-rc1.Linux-fedora44-x86_64-gcc16.0.tar.gz 372M
Ubuntu 22.04 root_v6.40.00-rc1.Linux-ubuntu22.04-x86_64-gcc11.4.tar.gz 306M
Ubuntu 24.04 root_v6.40.00-rc1.Linux-ubuntu24.04-x86_64-gcc13.3.tar.gz 323M
Ubuntu 26.04 root_v6.40.00-rc1.Linux-ubuntu26.04-x86_64-gcc15.2.tar.gz 327M
macOS 14.8 x86_64 Xcode 16 root_v6.40.00-rc1.macos-14.8-x86_64-clang160.pkg 477M
macOS 14.8 x86_64 Xcode 16 root_v6.40.00-rc1.macos-14.8-x86_64-clang160.tar.gz 312M
macOS 15.7 arm64 Xcode 17 root_v6.40.00-rc1.macos-15.7-arm64-clang170.pkg 464M
macOS 15.7 arm64 Xcode 17 root_v6.40.00-rc1.macos-15.7-arm64-clang170.tar.gz 308M
macOS 26.4 arm64 Xcode 21 root_v6.40.00-rc1.macos-26.4-arm64-clang210.pkg 479M
macOS 26.4 arm64 Xcode 21 root_v6.40.00-rc1.macos-26.4-arm64-clang210.tar.gz 320M
Windows Visual Studio 2025 32-bit x86 root_v6.40.00-rc1.win32.python314.vc18.exe 152M
Windows Visual Studio 2025 32-bit x86 root_v6.40.00-rc1.win32.python314.vc18.zip 213M
Windows Visual Studio 2022 64-bit x64 root_v6.40.00-rc1.win64.python311.vc17.exe 137M
Windows Visual Studio 2022 64-bit x64 root_v6.40.00-rc1.win64.python311.vc17.zip 188M
Windows Visual Studio 2025 64-bit x64 (release with debugging information) root_v6.40.00-rc1.win64.python314.vc18.relwithdebinfo.exe 447M
Windows Visual Studio 2025 64-bit x64 (release with debugging information) root_v6.40.00-rc1.win64.python314.vc18.relwithdebinfo.zip 709M

Source distribution

Platform Files Size
source root_v6.40.00-rc1.source.tar.gz 328M

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).