diff --git a/Gemfile b/Gemfile
index 749556b9..9ab1e017 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', '3.6.2', require: false
+gem 'test-unit', '3.6.3', require: false
 gem 'webrick', '1.9.0'
 gem 'xcop', '0.7.1'
diff --git a/Gemfile.lock b/Gemfile.lock
index 1cd5457b..51d8814a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -135,7 +135,7 @@ GEM
       rainbow (~> 3.0)
       ruby-filemagic (~> 0.7.2)
       slop (~> 4.6)
-    power_assert (2.0.3)
+    power_assert (2.0.4)
     public_suffix (5.1.1)
     racc (1.8.1)
     rack (3.1.8)
@@ -216,7 +216,7 @@ GEM
     temple (0.10.3)
     terminal-table (3.0.2)
       unicode-display_width (>= 1.1.1, < 3)
-    test-unit (3.6.2)
+    test-unit (3.6.3)
       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 (= 3.6.2)
+  test-unit (= 3.6.3)
   webrick (= 1.9.0)
   xcop (= 0.7.1)