diff --git a/Gemfile b/Gemfile
index a2bdebb..119703b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,11 +3,11 @@ source "https://rubygems.org"
 gem "rake"
 gem "base64"
 gem "dotenv"
-gem "minitest", "~> 5.27"
+gem "minitest", "~> 6.0"
 gem "minitest-reporters"
-gem "minitest-mock_expectations"
 gem "vcr"
 gem "webmock"
+gem "cgi" # needed for Ruby 4.0 until http-cookie gem adds dependency
 
 group :test do
   gem "simplecov", require: false
diff --git a/Gemfile.lock b/Gemfile.lock
index 32f8642..4f378a1 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -13,13 +13,15 @@ GEM
     base64 (0.3.0)
     bigdecimal (4.0.1)
     builder (3.3.0)
+    cgi (0.5.1)
     crack (1.0.1)
       bigdecimal
       rexml
     docile (1.4.1)
     domain_name (0.6.20240107)
     dotenv (3.2.0)
-    ffi (1.17.3)
+    drb (2.2.3)
+    ffi (1.17.3-arm64-darwin)
     ffi-compiler (1.3.2)
       ffi (>= 1.15.5)
       rake
@@ -35,14 +37,16 @@ GEM
     llhttp-ffi (0.5.1)
       ffi-compiler (~> 1.0)
       rake (~> 13.0)
-    minitest (5.27.0)
-    minitest-mock_expectations (1.2.0)
+    minitest (6.0.2)
+      drb (~> 2.0)
+      prism (~> 1.5)
     minitest-reporters (1.7.1)
       ansi
       builder
       minitest (>= 5.0)
       ruby-progressbar
-    public_suffix (7.0.0)
+    prism (1.9.0)
+    public_suffix (7.0.2)
     rake (13.3.1)
     rexml (3.4.4)
     ruby-progressbar (1.13.0)
@@ -66,9 +70,9 @@ PLATFORMS
 
 DEPENDENCIES
   base64
+  cgi
   dotenv
-  minitest (~> 5.27)
-  minitest-mock_expectations
+  minitest (~> 6.0)
   minitest-reporters
   paysafe!
   rake
diff --git a/test/test_helper.rb b/test/test_helper.rb
index e599ec1..31da649 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -12,11 +12,16 @@
 require 'base64'
 require 'minitest/autorun'
 require 'minitest/reporters'
-require 'minitest/mock_expectations'
 require 'webmock/minitest'
 require 'vcr'
 require 'dotenv/load'
 
+# Remove this register_plugin when minitest-reporters is released with:
+# https://github.com/minitest-reporters/minitest-reporters/pull/366
+# https://github.com/minitest-reporters/minitest-reporters/pull/366#issuecomment-3731951673
+require 'minitest/minitest_reporter_plugin'
+Minitest.register_plugin :minitest_reporter
+
 Minitest::Reporters.use!([Minitest::Reporters::SpecReporter.new])
 
 VCR.configure do |c|