diff --git a/Gemfile b/Gemfile
index 655be500f..1112f4f7b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -16,3 +16,5 @@ group :test do
   gem "sqlite3"
   gem "timecop", "~> 0.7.1"
 end
+
+gem "minitest", "~> 5.10.3"