Release 6.26/00 - 2022-03-03


Due to a security vulnerability, this version of ROOT has been retracted; please upgrade to v6.26/14.


The major new features of v6.26 are:

  • RooFit now comes with way nicer python interfaces and automatic GPU acceleration!
  • Try distributed RDataFrame: many physicists already use it to run RDataFrame-based analyses in parallel on clusters. It now supports Dask, which means it runs virtually anywhere you want.
  • Experimental RDataFrame::Vary() for systematic variations within the same event loop, with a wonderful, simple interface.
  • SOFIE can take your trained ONNX model and generate blazingly fast C++ code from it, depending only on BLAS.
  • TBrowser is now using ROOT’s new web-based graphics and GUI! You can always switch back, but we’d love to hear your feedback!

Release Notes

The release notes for this release can be found here.

Source distribution

Platform Files Size
source root_v6.26.00.source.tar.gz 185M

Binary distributions

Platform Files Size
CentOS 8 root_v6.26.00.Linux-centos8-x86_64-gcc8.5.tar.gz 208M
Fedora 32 root_v6.26.00.Linux-fedora32-x86_64-gcc10.3.tar.gz 230M
Fedora 34 root_v6.26.00.Linux-fedora34-x86_64-gcc11.2.tar.gz 278M
Ubuntu 18.04 root_v6.26.00.Linux-ubuntu18-x86_64-gcc7.5.tar.gz 225M
Ubuntu 20.04 root_v6.26.00.Linux-ubuntu20-x86_64-gcc9.3.tar.gz 225M
macOS 10.15 x86_64 Xcode 12 root_v6.26.00.macos-10.15-x86_64-clang120.pkg 335M
macOS 10.15 x86_64 Xcode 12 root_v6.26.00.macos-10.15-x86_64-clang120.tar.gz 218M
macOS 11.6 arm64 Xcode 12 root_v6.26.00.macos-11.6-arm64-clang120.pkg 318M
macOS 11.6 arm64 Xcode 12 root_v6.26.00.macos-11.6-arm64-clang120.tar.gz 205M
macOS 11.6 x86_64 Xcode 12 root_v6.26.00.macos-11.6-x86_64-clang120.pkg 333M
macOS 11.6 x86_64 Xcode 12 root_v6.26.00.macos-11.6-x86_64-clang120.tar.gz 217M
macOS 12.2 arm64 Xcode 13 root_v6.26.00.macos-12.2-arm64-clang130.pkg 320M
macOS 12.2 arm64 Xcode 13 root_v6.26.00.macos-12.2-arm64-clang130.tar.gz 206M
macOS 12.2 x86_64 Xcode 13 root_v6.26.00.macos-12.2-x86_64-clang130.pkg 335M
macOS 12.2 x86_64 Xcode 13 root_v6.26.00.macos-12.2-x86_64-clang130.tar.gz 218M
preview Windows Visual Studio 2019 (debug) root_v6.26.00.win32.vc16.debug.exe 200M
preview Windows Visual Studio 2019 (debug) 298M
preview Windows Visual Studio 2019 root_v6.26.00.win32.vc16.exe 105M
preview Windows Visual Studio 2019 143M

Installations in CVMFS

Standalone installations with minimal external dependencies are available at:



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

git clone

The release specific tag can be obtained using:

cd root
git checkout -b v6-26-00 v6-26-00


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.

Important installation notes

  • You must download the binary built with the exact same version of Visual Studio than the one installed on your system.
  • 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).