diff --git a/Gemfile b/Gemfile
index 6fe376b..051062a 100644
--- a/Gemfile
+++ b/Gemfile
@@ -12,7 +12,7 @@ gem 'rack',              '~> 2.2'
 gem 'sinatra',           '~> 2.1'
 
 group :test do
-  gem 'minitest',            '~> 5.17'
+  gem 'minitest',            '~> 5.18'
   gem 'minitest-reporters', '~> 1.4', '>= 1.4.3'
   gem 'rack-test',           '~> 2.0'
   gem 'rubocop',             '~> 1.44'
diff --git a/Gemfile.lock b/Gemfile.lock
index 223cfb2..348b02b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -8,7 +8,7 @@ GEM
     mail (2.7.1)
       mini_mime (>= 0.1.1)
     mini_mime (1.1.2)
-    minitest (5.17.0)
+    minitest (5.18.0)
     minitest-reporters (1.5.0)
       ansi
       builder
@@ -72,7 +72,7 @@ PLATFORMS
 
 DEPENDENCIES
   json (~> 2.6)
-  minitest (~> 5.17)
+  minitest (~> 5.18)
   minitest-reporters (~> 1.4, >= 1.4.3)
   net-smtp (~> 0.3.3)
   passenger (~> 6.0)