diff --git a/Documentation/dev-crafting-changes.txt b/Documentation/dev-crafting-changes.txt
index 3be9472..2bbbc45 100644
--- a/Documentation/dev-crafting-changes.txt
+++ b/Documentation/dev-crafting-changes.txt
@@ -146,7 +146,7 @@
 link:https://github.com/google/google-java-format[`google-java-format`]
 tool (version 1.7), and to format Bazel BUILD, WORKSPACE and .bzl files the
 link:https://github.com/bazelbuild/buildtools/tree/master/buildifier[`buildifier`]
-tool (version 3.5.0). Unused dependencies are found and removed using the
+tool (version 4.0.0). Unused dependencies are found and removed using the
 link:https://github.com/bazelbuild/buildtools/tree/master/unused_deps[`unused_deps`]
 build tool, a sibling of `buildifier`.
 
diff --git a/WORKSPACE b/WORKSPACE
index 00fb536..54c0f8f 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -11,6 +11,7 @@
     sha256 = "1adf7a8e9901287c644dcf9ca08dd8d67a69df94bedbd57a841490a84dc1e9ed",
     strip_prefix = "bazel-toolchains-5.0.0",
     urls = [
+        "https://mirror.bazel.build/github.com/bazelbuild/bazel-toolchains/archive/v5.0.0.tar.gz",
         "https://github.com/bazelbuild/bazel-toolchains/archive/v5.0.0.tar.gz",
     ],
 )