diff --git a/lib/bundled_gems.rb b/lib/bundled_gems.rb
index 12e805f59e93c3..7adc0260ab3898 100644
--- a/lib/bundled_gems.rb
+++ b/lib/bundled_gems.rb
@@ -32,6 +32,7 @@ module Gem::BUNDLED_GEMS
     "win32ole" => "3.5.0",
     "fiddle" => "3.5.0",
     "logger" => "3.5.0",
+    "benchmark" => "3.5.0",
     "irb" => "3.5.0",
     "reline" => "3.5.0",
     # "readline" => "3.5.0", # This is wrapper for reline. We don't warn for this.