diff --git a/Gemfile b/Gemfile
index a8d84a7664..08c23c95bb 100644
--- a/Gemfile
+++ b/Gemfile
@@ -15,6 +15,6 @@ gem 'rubocop', '1.81.7'
 gem 'rubocop-minitest', '0.38.2'
 gem 'rubocop-rake', '0.7.1'
 gem 'simplecov', '0.22.0'
-gem 'test-unit', '3.7.1'
+gem 'test-unit', '3.7.7'
 gem 'timecop', '0.9.10'
 gem 'yard', '0.9.38'
diff --git a/Gemfile.lock b/Gemfile.lock
index e2ce99ddc5..5b7783368a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -81,7 +81,7 @@ GEM
     simplecov-html (0.13.2)
     simplecov_json_formatter (0.1.4)
     stringio (3.2.0)
-    test-unit (3.7.1)
+    test-unit (3.7.7)
       power_assert
     timecop (0.9.10)
     tsort (0.2.0)
@@ -106,7 +106,7 @@ DEPENDENCIES
   rubocop-minitest (= 0.38.2)
   rubocop-rake (= 0.7.1)
   simplecov (= 0.22.0)
-  test-unit (= 3.7.1)
+  test-unit (= 3.7.7)
   timecop (= 0.9.10)
   yard (= 0.9.38)