diff --git a/gems/bundled_gems b/gems/bundled_gems
index f5c59bd15e..686065c8de 100644
--- a/gems/bundled_gems
+++ b/gems/bundled_gems
@@ -9,7 +9,7 @@
 minitest            5.25.2  https://github.com/minitest/minitest
 power_assert        2.0.4   https://github.com/ruby/power_assert
 rake                13.2.1  https://github.com/ruby/rake
-test-unit           3.6.2   https://github.com/test-unit/test-unit
+test-unit           3.6.3   https://github.com/test-unit/test-unit
 rexml               3.3.9   https://github.com/ruby/rexml
 rss                 0.3.1   https://github.com/ruby/rss
 net-ftp             0.3.8   https://github.com/ruby/net-ftp