diff --git a/Gemfile b/Gemfile
index 0c1240d..4e96051 100644
--- a/Gemfile
+++ b/Gemfile
@@ -20,4 +20,5 @@ group :development do
   gem "rack-test"
   gem "rspec"
   gem "standard"
+  gem "minitest"
 end
diff --git a/Gemfile.lock b/Gemfile.lock
index 89ba418..6d6b6b9 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -12,6 +12,7 @@ GEM
     language_server-protocol (3.17.0.4)
     lint_roller (1.1.0)
     logger (1.6.6)
+    minitest (5.25.4)
     multi_json (1.15.0)
     mustermann (3.0.3)
       ruby2_keywords (~> 0.0.1)
@@ -119,6 +120,7 @@ DEPENDENCIES
   anyflake
   jwt
   ksuid
+  minitest
   nanoid
   puma
   rack-test