diff --git a/README.md b/README.md
index 133467e145..137793efcb 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 
 [![PyPI version](https://img.shields.io/pypi/v/ortools.svg)](https://pypi.org/project/ortools/)
 [![PyPI download](https://img.shields.io/pypi/dm/ortools.svg)](https://pypi.org/project/ortools/#files)
-[![Binder](https://mybinder.org/badge.svg)](https://mybinder.org/v2/gh/google/or-tools/master)
+[![Binder](https://mybinder.org/badge.svg)](https://mybinder.org/v2/gh/google/or-tools/main)
 \
 [![NuGet version](https://img.shields.io/nuget/v/Google.OrTools.svg)](https://www.nuget.org/packages/Google.OrTools)
 [![NuGet download](https://img.shields.io/nuget/dt/Google.OrTools.svg)](https://www.nuget.org/packages/Google.OrTools)
@@ -54,7 +54,7 @@ This software suite is composed of the following components:
     [CMake](https://cmake.org/cmake/help/latest/) based build.
 *   [cmake](cmake) Subsidiary CMake files, CI and build system documentation.
 *   [WORKSPACE](WORKSPACE) Top-level for
-    [Bazel](https://docs.bazel.build/versions/master/bazel-overview.html) based build.
+    [Bazel](https://bazel.build/start/bazel-intro) based build.
 *   [bazel](bazel) Subsidiary Bazel files, CI and build system documentation.
 *   [ortools](ortools) Root directory for source code.
     *   [base](ortools/base) Basic utilities.
diff --git a/bazel/README.md b/bazel/README.md
index cc6dcb04a0..22b2e8bf0b 100644
--- a/bazel/README.md
+++ b/bazel/README.md
@@ -5,16 +5,16 @@
 | MacOS    | [![Status][macos_svg]][macos_link] |
 | Windows  | [![Status][windows_svg]][windows_link] |
 
-[linux_svg]: https://github.com/google/or-tools/actions/workflows/bazel_linux.yml/badge.svg?branch=master
+[linux_svg]: https://github.com/google/or-tools/actions/workflows/bazel_linux.yml/badge.svg?branch=main
 [linux_link]: https://github.com/google/or-tools/actions/workflows/bazel_linux.yml
-[macos_svg]: https://github.com/google/or-tools/actions/workflows/bazel_macos.yml/badge.svg?branch=master
+[macos_svg]: https://github.com/google/or-tools/actions/workflows/bazel_macos.yml/badge.svg?branch=main
 [macos_link]: https://github.com/google/or-tools/actions/workflows/bazel_macos.yml
-[windows_svg]: https://github.com/google/or-tools/actions/workflows/bazel_windows.yml/badge.svg?branch=master
+[windows_svg]: https://github.com/google/or-tools/actions/workflows/bazel_windows.yml/badge.svg?branch=main
 [windows_link]: https://github.com/google/or-tools/actions/workflows/bazel_windows.yml
 
 Dockers [Alpine, Archlinux, Centos, Debian, Fedora, OpenSuse, Ubuntu]: [![Status][docker_svg]][docker_link]
 
-[docker_svg]: https://github.com/google/or-tools/actions/workflows/bazel_docker.yml/badge.svg?branch=master
+[docker_svg]: https://github.com/google/or-tools/actions/workflows/bazel_docker.yml/badge.svg?branch=main
 [docker_link]: https://github.com/google/or-tools/actions/workflows/bazel_docker.yml
 
 ## Introduction
diff --git a/cmake/README.md b/cmake/README.md
index 13e564e9ec..9c8c502c11 100644
--- a/cmake/README.md
+++ b/cmake/README.md
@@ -5,36 +5,36 @@
 | MacOS    | [![Status][macos_cpp_svg]][macos_cpp_link] | [![Status][macos_python_svg]][macos_python_link] | [![Status][macos_java_svg]][macos_java_link] | [![Status][macos_dotnet_svg]][macos_dotnet_link] |
 | Windows  | [![Status][windows_cpp_svg]][windows_cpp_link] | [![Status][windows_python_svg]][windows_python_link] | [![Status][windows_java_svg]][windows_java_link] | [![Status][windows_dotnet_svg]][windows_dotnet_link] |
 
-[linux_cpp_svg]: https://github.com/google/or-tools/actions/workflows/cmake_linux_cpp.yml/badge.svg?branch=master
+[linux_cpp_svg]: https://github.com/google/or-tools/actions/workflows/cmake_linux_cpp.yml/badge.svg?branch=main
 [linux_cpp_link]: https://github.com/google/or-tools/actions/workflows/cmake_linux_cpp.yml
-[linux_python_svg]: https://github.com/google/or-tools/actions/workflows/cmake_linux_python.yml/badge.svg?branch=master
+[linux_python_svg]: https://github.com/google/or-tools/actions/workflows/cmake_linux_python.yml/badge.svg?branch=main
 [linux_python_link]: https://github.com/google/or-tools/actions/workflows/cmake_linux_python.yml
-[linux_java_svg]: https://github.com/google/or-tools/actions/workflows/cmake_linux_java.yml/badge.svg?branch=master
+[linux_java_svg]: https://github.com/google/or-tools/actions/workflows/cmake_linux_java.yml/badge.svg?branch=main
 [linux_java_link]: https://github.com/google/or-tools/actions/workflows/cmake_linux_java.yml
-[linux_dotnet_svg]: https://github.com/google/or-tools/actions/workflows/cmake_linux_dotnet.yml/badge.svg?branch=master
+[linux_dotnet_svg]: https://github.com/google/or-tools/actions/workflows/cmake_linux_dotnet.yml/badge.svg?branch=main
 [linux_dotnet_link]: https://github.com/google/or-tools/actions/workflows/cmake_linux_dotnet.yml
 
-[macos_cpp_svg]: https://github.com/google/or-tools/actions/workflows/cmake_macos_cpp.yml/badge.svg?branch=master
+[macos_cpp_svg]: https://github.com/google/or-tools/actions/workflows/cmake_macos_cpp.yml/badge.svg?branch=main
 [macos_cpp_link]: https://github.com/google/or-tools/actions/workflows/cmake_macos_cpp.yml
-[macos_python_svg]: https://github.com/google/or-tools/actions/workflows/cmake_macos_python.yml/badge.svg?branch=master
+[macos_python_svg]: https://github.com/google/or-tools/actions/workflows/cmake_macos_python.yml/badge.svg?branch=main
 [macos_python_link]: https://github.com/google/or-tools/actions/workflows/cmake_macos_python.yml
-[macos_java_svg]: https://github.com/google/or-tools/actions/workflows/cmake_macos_java.yml/badge.svg?branch=master
+[macos_java_svg]: https://github.com/google/or-tools/actions/workflows/cmake_macos_java.yml/badge.svg?branch=main
 [macos_java_link]: https://github.com/google/or-tools/actions/workflows/cmake_macos_java.yml
-[macos_dotnet_svg]: https://github.com/google/or-tools/actions/workflows/cmake_macos_dotnet.yml/badge.svg?branch=master
+[macos_dotnet_svg]: https://github.com/google/or-tools/actions/workflows/cmake_macos_dotnet.yml/badge.svg?branch=main
 [macos_dotnet_link]: https://github.com/google/or-tools/actions/workflows/cmake_macos_dotnet.yml
 
-[windows_cpp_svg]: https://github.com/google/or-tools/actions/workflows/cmake_windows_cpp.yml/badge.svg?branch=master
+[windows_cpp_svg]: https://github.com/google/or-tools/actions/workflows/cmake_windows_cpp.yml/badge.svg?branch=main
 [windows_cpp_link]: https://github.com/google/or-tools/actions/workflows/cmake_windows_cpp.yml
-[windows_python_svg]: https://github.com/google/or-tools/actions/workflows/cmake_windows_python.yml/badge.svg?branch=master
+[windows_python_svg]: https://github.com/google/or-tools/actions/workflows/cmake_windows_python.yml/badge.svg?branch=main
 [windows_python_link]: https://github.com/google/or-tools/actions/workflows/cmake_windows_python.yml
-[windows_java_svg]: https://github.com/google/or-tools/actions/workflows/cmake_windows_java.yml/badge.svg?branch=master
+[windows_java_svg]: https://github.com/google/or-tools/actions/workflows/cmake_windows_java.yml/badge.svg?branch=main
 [windows_java_link]: https://github.com/google/or-tools/actions/workflows/cmake_windows_java.yml
-[windows_dotnet_svg]: https://github.com/google/or-tools/actions/workflows/cmake_windows_dotnet.yml/badge.svg?branch=master
+[windows_dotnet_svg]: https://github.com/google/or-tools/actions/workflows/cmake_windows_dotnet.yml/badge.svg?branch=main
 [windows_dotnet_link]: https://github.com/google/or-tools/actions/workflows/cmake_windows_dotnet.yml
 
 Dockers [Alpine, Archlinux, Centos, Debian, Fedora, OpenSuse, Ubuntu]x[C++, Python, Java, .Net]: [![Status][docker_svg]][docker_link]
 
-[docker_svg]: https://github.com/google/or-tools/actions/workflows/cmake_docker.yml/badge.svg?branch=master
+[docker_svg]: https://github.com/google/or-tools/actions/workflows/cmake_docker.yml/badge.svg?branch=main
 [docker_link]: https://github.com/google/or-tools/actions/workflows/cmake_docker.yml
 
 
@@ -243,7 +243,7 @@ automatically to your target as needed.
 
 The recommendations below are similar to those for using CMake within the
 googletest framework
-(<https://github.com/google/googletest/blob/master/googletest/README.md#incorporating-into-an-existing-cmake-project>)
+(<https://github.com/google/googletest/blob/main/googletest/README.md#incorporating-into-an-existing-cmake-project>)
 
 Thus, you can use the CMake command
 [`add_subdirectory()`](https://cmake.org/cmake/help/latest/command/add_subdirectory.html)
@@ -279,7 +279,7 @@ include(FetchContent)
 FetchContent_Declare(
   or-tools
   GIT_REPOSITORY https://github.com/google/or-tools.git
-  GIT_TAG        master
+  GIT_TAG        main
 )
 
 # After the following call, the CMake targets defined by or-tools
diff --git a/cmake/docs/cpp.md b/cmake/docs/cpp.md
index 7e09acc3f1..eafbff5c9f 100644
--- a/cmake/docs/cpp.md
+++ b/cmake/docs/cpp.md
@@ -2,11 +2,11 @@ Linux                                      | macOS
 ------------------------------------------ | ------------------------------------------ | -------
 [![Status][linux_cpp_svg]][linux_cpp_link] | [![Status][macos_cpp_svg]][macos_cpp_link] | [![Status][windows_cpp_svg]][windows_cpp_link]
 
-[linux_cpp_svg]: https://github.com/google/or-tools/actions/workflows/cmake_linux_cpp.yml/badge.svg?branch=master
+[linux_cpp_svg]: https://github.com/google/or-tools/actions/workflows/cmake_linux_cpp.yml/badge.svg?branch=main
 [linux_cpp_link]: https://github.com/google/or-tools/actions/workflows/cmake_linux_cpp.yml
-[macos_cpp_svg]: https://github.com/google/or-tools/actions/workflows/cmake_macos_cpp.yml/badge.svg?branch=master
+[macos_cpp_svg]: https://github.com/google/or-tools/actions/workflows/cmake_macos_cpp.yml/badge.svg?branch=main
 [macos_cpp_link]: https://github.com/google/or-tools/actions/workflows/cmake_macos_cpp.yml
-[windows_cpp_svg]: https://github.com/google/or-tools/actions/workflows/cmake_windows_cpp.yml/badge.svg?branch=master
+[windows_cpp_svg]: https://github.com/google/or-tools/actions/workflows/cmake_windows_cpp.yml/badge.svg?branch=main
 [windows_cpp_link]: https://github.com/google/or-tools/actions/workflows/cmake_windows_cpp.yml
 
 # Introduction
diff --git a/cmake/docs/dotnet.md b/cmake/docs/dotnet.md
index 0ddfb60b2c..a71137ee7d 100644
--- a/cmake/docs/dotnet.md
+++ b/cmake/docs/dotnet.md
@@ -2,11 +2,11 @@ Linux                                            | macOS
 ------------------------------------------------ | ------------------------------------------------ | -------
 [![Status][linux_dotnet_svg]][linux_dotnet_link] | [![Status][macos_dotnet_svg]][macos_dotnet_link] | [![Status][windows_dotnet_svg]][windows_dotnet_link]
 
-[linux_dotnet_svg]: https://github.com/google/or-tools/actions/workflows/cmake_linux_dotnet.yml/badge.svg?branch=master
+[linux_dotnet_svg]: https://github.com/google/or-tools/actions/workflows/cmake_linux_dotnet.yml/badge.svg?branch=main
 [linux_dotnet_link]: https://github.com/google/or-tools/actions/workflows/cmake_linux_dotnet.yml
-[macos_dotnet_svg]: https://github.com/google/or-tools/actions/workflows/cmake_macos_dotnet.yml/badge.svg?branch=master
+[macos_dotnet_svg]: https://github.com/google/or-tools/actions/workflows/cmake_macos_dotnet.yml/badge.svg?branch=main
 [macos_dotnet_link]: https://github.com/google/or-tools/actions/workflows/cmake_macos_dotnet.yml
-[windows_dotnet_svg]: https://github.com/google/or-tools/actions/workflows/cmake_windows_dotnet.yml/badge.svg?branch=master
+[windows_dotnet_svg]: https://github.com/google/or-tools/actions/workflows/cmake_windows_dotnet.yml/badge.svg?branch=main
 [windows_dotnet_link]: https://github.com/google/or-tools/actions/workflows/cmake_windows_dotnet.yml
 
 # Introduction
diff --git a/cmake/docs/java.md b/cmake/docs/java.md
index 736815d7b2..6c1300a639 100644
--- a/cmake/docs/java.md
+++ b/cmake/docs/java.md
@@ -2,11 +2,11 @@ Linux                                        | macOS
 -------------------------------------------- | -------------------------------------------- | -------
 [![Status][linux_java_svg]][linux_java_link] | [![Status][macos_java_svg]][macos_java_link] | [![Status][windows_java_svg]][windows_java_link]
 
-[linux_java_svg]: https://github.com/google/or-tools/actions/workflows/cmake_linux_java.yml/badge.svg?branch=master
+[linux_java_svg]: https://github.com/google/or-tools/actions/workflows/cmake_linux_java.yml/badge.svg?branch=main
 [linux_java_link]: https://github.com/google/or-tools/actions/workflows/cmake_linux_java.yml
-[macos_java_svg]: https://github.com/google/or-tools/actions/workflows/cmake_macos_java.yml/badge.svg?branch=master
+[macos_java_svg]: https://github.com/google/or-tools/actions/workflows/cmake_macos_java.yml/badge.svg?branch=main
 [macos_java_link]: https://github.com/google/or-tools/actions/workflows/cmake_macos_java.yml
-[windows_java_svg]: https://github.com/google/or-tools/actions/workflows/cmake_windows_java.yml/badge.svg?branch=master
+[windows_java_svg]: https://github.com/google/or-tools/actions/workflows/cmake_windows_java.yml/badge.svg?branch=main
 [windows_java_link]: https://github.com/google/or-tools/actions/workflows/cmake_windows_java.yml
 
 # Introduction
diff --git a/cmake/docs/python.md b/cmake/docs/python.md
index 106eaec68d..688802305b 100644
--- a/cmake/docs/python.md
+++ b/cmake/docs/python.md
@@ -2,11 +2,11 @@ Linux                                            | macOS
 ------------------------------------------------ | ------------------------------------------------ | -------
 [![Status][linux_python_svg]][linux_python_link] | [![Status][macos_python_svg]][macos_python_link] | [![Status][windows_python_svg]][windows_python_link]
 
-[linux_python_svg]: https://github.com/google/or-tools/actions/workflows/cmake_linux_python.yml/badge.svg?branch=master
+[linux_python_svg]: https://github.com/google/or-tools/actions/workflows/cmake_linux_python.yml/badge.svg?branch=main
 [linux_python_link]: https://github.com/google/or-tools/actions/workflows/cmake_linux_python.yml
-[macos_python_svg]: https://github.com/google/or-tools/actions/workflows/cmake_macos_python.yml/badge.svg?branch=master
+[macos_python_svg]: https://github.com/google/or-tools/actions/workflows/cmake_macos_python.yml/badge.svg?branch=main
 [macos_python_link]: https://github.com/google/or-tools/actions/workflows/cmake_macos_python.yml
-[windows_python_svg]: https://github.com/google/or-tools/actions/workflows/cmake_windows_python.yml/badge.svg?branch=master
+[windows_python_svg]: https://github.com/google/or-tools/actions/workflows/cmake_windows_python.yml/badge.svg?branch=main
 [windows_python_link]: https://github.com/google/or-tools/actions/workflows/cmake_windows_python.yml
 
 # Introduction
diff --git a/makefiles/README.md b/makefiles/README.md
index 4e2fd48600..135c18a1f2 100644
--- a/makefiles/README.md
+++ b/makefiles/README.md
@@ -5,37 +5,37 @@
 | MacOS    | [![Status][macos_cpp_svg]][macos_cpp_link] | [![Status][macos_python_svg]][macos_python_link] | [![Status][macos_java_svg]][macos_java_link] | [![Status][macos_dotnet_svg]][macos_dotnet_link] |
 | Windows  | [![Status][windows_cpp_svg]][windows_cpp_link] | [![Status][windows_python_svg]][windows_python_link] | [![Status][windows_java_svg]][windows_java_link] | [![Status][windows_dotnet_svg]][windows_dotnet_link] |
 
-[linux_cpp_svg]: https://github.com/google/or-tools/actions/workflows/make_linux_cpp.yml/badge.svg?branch=master
+[linux_cpp_svg]: https://github.com/google/or-tools/actions/workflows/make_linux_cpp.yml/badge.svg?branch=main
 [linux_cpp_link]: https://github.com/google/or-tools/actions/workflows/make_linux_cpp.yml
-[linux_python_svg]: https://github.com/google/or-tools/actions/workflows/make_linux_python.yml/badge.svg?branch=master
+[linux_python_svg]: https://github.com/google/or-tools/actions/workflows/make_linux_python.yml/badge.svg?branch=main
 [linux_python_link]: https://github.com/google/or-tools/actions/workflows/make_linux_python.yml
-[linux_java_svg]: https://github.com/google/or-tools/actions/workflows/make_linux_java.yml/badge.svg?branch=master
+[linux_java_svg]: https://github.com/google/or-tools/actions/workflows/make_linux_java.yml/badge.svg?branch=main
 [linux_java_link]: https://github.com/google/or-tools/actions/workflows/make_linux_java.yml
-[linux_dotnet_svg]: https://github.com/google/or-tools/actions/workflows/make_linux_dotnet.yml/badge.svg?branch=master
+[linux_dotnet_svg]: https://github.com/google/or-tools/actions/workflows/make_linux_dotnet.yml/badge.svg?branch=main
 [linux_dotnet_link]: https://github.com/google/or-tools/actions/workflows/make_linux_dotnet.yml
 
-[macos_cpp_svg]: https://github.com/google/or-tools/actions/workflows/make_macos_cpp.yml/badge.svg?branch=master
+[macos_cpp_svg]: https://github.com/google/or-tools/actions/workflows/make_macos_cpp.yml/badge.svg?branch=main
 [macos_cpp_link]: https://github.com/google/or-tools/actions/workflows/make_macos_cpp.yml
-[macos_python_svg]: https://github.com/google/or-tools/actions/workflows/make_macos_python.yml/badge.svg?branch=master
+[macos_python_svg]: https://github.com/google/or-tools/actions/workflows/make_macos_python.yml/badge.svg?branch=main
 [macos_python_link]: https://github.com/google/or-tools/actions/workflows/make_macos_python.yml
-[macos_java_svg]: https://github.com/google/or-tools/actions/workflows/make_macos_java.yml/badge.svg?branch=master
+[macos_java_svg]: https://github.com/google/or-tools/actions/workflows/make_macos_java.yml/badge.svg?branch=main
 [macos_java_link]: https://github.com/google/or-tools/actions/workflows/make_macos_java.yml
-[macos_dotnet_svg]: https://github.com/google/or-tools/actions/workflows/make_macos_dotnet.yml/badge.svg?branch=master
+[macos_dotnet_svg]: https://github.com/google/or-tools/actions/workflows/make_macos_dotnet.yml/badge.svg?branch=main
 [macos_dotnet_link]: https://github.com/google/or-tools/actions/workflows/make_macos_dotnet.yml
 
-[windows_cpp_svg]: https://github.com/google/or-tools/actions/workflows/make_windows_cpp.yml/badge.svg?branch=master
+[windows_cpp_svg]: https://github.com/google/or-tools/actions/workflows/make_windows_cpp.yml/badge.svg?branch=main
 [windows_cpp_link]: https://github.com/google/or-tools/actions/workflows/make_windows_cpp.yml
-[windows_python_svg]: https://github.com/google/or-tools/actions/workflows/make_windows_python.yml/badge.svg?branch=master
+[windows_python_svg]: https://github.com/google/or-tools/actions/workflows/make_windows_python.yml/badge.svg?branch=main
 [windows_python_link]: https://github.com/google/or-tools/actions/workflows/make_windows_python.yml
-[windows_java_svg]: https://github.com/google/or-tools/actions/workflows/make_windows_java.yml/badge.svg?branch=master
+[windows_java_svg]: https://github.com/google/or-tools/actions/workflows/make_windows_java.yml/badge.svg?branch=main
 [windows_java_link]: https://github.com/google/or-tools/actions/workflows/make_windows_java.yml
-[windows_dotnet_svg]: https://github.com/google/or-tools/actions/workflows/make_windows_dotnet.yml/badge.svg?branch=master
+[windows_dotnet_svg]: https://github.com/google/or-tools/actions/workflows/make_windows_dotnet.yml/badge.svg?branch=main
 [windows_dotnet_link]: https://github.com/google/or-tools/actions/workflows/make_windows_dotnet.yml
 
 Dockers [Alpine, Archlinux, Centos, Debian, Fedora, OpenSuse, Ubuntu]x[C++,
 Python, Java, .Net]: [![Status][docker_svg]][docker_link]
 
-[docker_svg]: https://github.com/google/or-tools/actions/workflows/make_docker.yml/badge.svg?branch=master
+[docker_svg]: https://github.com/google/or-tools/actions/workflows/make_docker.yml/badge.svg?branch=main
 [docker_link]: https://github.com/google/or-tools/actions/workflows/make_docker.yml
 
 ## Introduction