diff --git a/lib/cgi.rb b/lib/cgi.rb
index 71b52b6267..b041c1bed1 100644
--- a/lib/cgi.rb
+++ b/lib/cgi.rb
@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 require "cgi/escape"
-warn <<-WARNING, uplevel: 1 if $VERBOSE
+warn <<-WARNING, uplevel: Gem::BUNDLED_GEMS.uplevel if $VERBOSE
 CGI library is removed from Ruby 3.5. Please use cgi/escape instead for CGI.escape and CGI.unescape features.
 If you need to use the full features of CGI library, Please install cgi gem.
 WARNING
diff --git a/lib/cgi/util.rb b/lib/cgi/util.rb
index b862341e90..07deeda266 100644
--- a/lib/cgi/util.rb
+++ b/lib/cgi/util.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
 require "cgi/escape"
-warn <<-WARNING, uplevel: 1 if $VERBOSE
+warn <<-WARNING, uplevel: Gem::BUNDLED_GEMS.uplevel if $VERBOSE
 CGI::Util is removed from Ruby 3.5. Please use cgi/escape instead for CGI.escape and CGI.unescape features.
 WARNING