diff --git a/gemfiles/3.1/Gemfile.lock b/gemfiles/3.1/Gemfile.lock
index 7757e23432..80f0323cd9 100644
--- a/gemfiles/3.1/Gemfile.lock
+++ b/gemfiles/3.1/Gemfile.lock
@@ -26,7 +26,7 @@ GEM
       logger
     ruby_memcheck (3.0.0)
       nokogiri
-    test-unit (3.6.2)
+    test-unit (3.6.4)
       power_assert
 
 PLATFORMS