diff --git a/Gemfile.lock b/Gemfile.lock
index 434b6f3..646d5b8 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -60,6 +60,7 @@ GEM
     hike (1.2.3)
     mime-types (2.6.1)
     mini_portile (0.6.2)
+    minitest (5.8.0)
     multi_json (1.11.2)
     nokogiri (1.6.6.2)
       mini_portile (~> 0.6.0)
@@ -116,6 +117,7 @@ PLATFORMS
 DEPENDENCIES
   capybara (~> 2.4.2)
   chromedriver2-helper (~> 0.0.8)
+  minitest
   opal!
   opal-browser
   opal-rspec (~> 0.4.2)