diff --git a/Gemfile b/Gemfile
index 8faea5b..a4c2e9c 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,7 +4,8 @@ source "https://rubygems.org"
 
 gemspec
 
-gem "minitest", "~> 5.0"
+gem "minitest", "~> 6.0"
+gem "minitest-mock"
 gem "rake", "~> 13.0"
 gem "rubocop", "~> 1.82"
 gem "yard", "~> 0.9"
diff --git a/Gemfile.lock b/Gemfile.lock
index 00f24e9..ea03df9 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -13,7 +13,9 @@ GEM
     json (2.18.0)
     language_server-protocol (3.17.0.5)
     lint_roller (1.1.0)
-    minitest (5.26.1)
+    minitest (6.0.1)
+      prism (~> 1.5)
+    minitest-mock (5.27.0)
     parallel (1.27.0)
     parser (3.3.10.0)
       ast (~> 2.4.1)
@@ -70,7 +72,8 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  minitest (~> 5.0)
+  minitest (~> 6.0)
+  minitest-mock
   railstart!
   rake (~> 13.0)
   rubocop (~> 1.82)
diff --git a/test/test_helper.rb b/test/test_helper.rb
index 640c338..b3f17f5 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -3,3 +3,4 @@
 $LOAD_PATH.unshift File.expand_path("../lib", __dir__)
 require "railstart"
 require "minitest/autorun"
+require "minitest/mock"