diff --git a/gemfiles/typecheck/Gemfile.lock b/gemfiles/typecheck/Gemfile.lock
index 67772c0583..4e22038ca8 100644
--- a/gemfiles/typecheck/Gemfile.lock
+++ b/gemfiles/typecheck/Gemfile.lock
@@ -100,7 +100,7 @@ GEM
       yard-sorbet
     terminal-table (3.0.2)
       unicode-display_width (>= 1.1.1, < 3)
-    test-unit (3.6.2)
+    test-unit (3.6.4)
       power_assert
     thor (1.3.2)
     tzinfo (2.0.6)