diff --git a/.github/actions/sync/shared-config.rb b/.github/actions/sync/shared-config.rb
index 3ff3d864..b24d7f46 100755
--- a/.github/actions/sync/shared-config.rb
+++ b/.github/actions/sync/shared-config.rb
@@ -173,6 +173,13 @@ def git(*args)
   end
 end
 
+# Update Gemfile.lock if it exists, based on the Ruby version.
+if (target_directory_path/"Gemfile.lock").exist?
+  target_directory_path.cd do
+    system "bundle", "install"
+  end
+end
+
 out, err, status = Open3.capture3("git", "-C", target_directory, "status", "--porcelain", "--ignore-submodules=dirty")
 raise err unless status.success?