diff --git a/Library/Homebrew/dev-cmd/vendor-gems.rb b/Library/Homebrew/dev-cmd/vendor-gems.rb
index ef07ee13c33e6..a2cae01cbc9c2 100644
--- a/Library/Homebrew/dev-cmd/vendor-gems.rb
+++ b/Library/Homebrew/dev-cmd/vendor-gems.rb
@@ -58,6 +58,7 @@ def vendor_gems
       # Although we don't use 2.4.21, Dependabot does as it currently ignores your lockfile version.
       # https://github.com/rubygems/rubygems/issues/7169
       safe_system "bundle", "lock", "--add-platform", "aarch64-linux", "arm-linux"
+      system "git", "add", "Gemfile.lock" unless args.no_commit?
 
       if args.non_bundler_gems?
         %w[