diff --git a/Gemfile b/Gemfile
index d6398dc..2c72588 100644
--- a/Gemfile
+++ b/Gemfile
@@ -49,6 +49,6 @@ gem 'simplecov-cobertura', '~> 2.1'
 gem 'sinatra', '4.0.0'
 gem 'sinatra-contrib', '4.0.0'
 gem 'sprockets', '4.2.1'
-gem 'test-unit', '3.6.3', require: false
+gem 'test-unit', '3.6.4', require: false
 gem 'webrick', '1.9.0'
 gem 'xcop', '0.7.1'
diff --git a/Gemfile.lock b/Gemfile.lock
index 154dd12..aa8b7c6 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -216,7 +216,7 @@ GEM
     temple (0.10.3)
     terminal-table (3.0.2)
       unicode-display_width (>= 1.1.1, < 3)
-    test-unit (3.6.3)
+    test-unit (3.6.4)
       power_assert
     tilt (2.3.0)
     timeout (0.4.1)
@@ -269,7 +269,7 @@ DEPENDENCIES
   sinatra (= 4.0.0)
   sinatra-contrib (= 4.0.0)
   sprockets (= 4.2.1)
-  test-unit (= 3.6.3)
+  test-unit (= 3.6.4)
   webrick (= 1.9.0)
   xcop (= 0.7.1)