diff --git a/Gemfile.lock b/Gemfile.lock
index b45bcfc..5dd83f4 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -8,6 +8,7 @@ GEM
   remote: https://rubygems.org/
   specs:
     colorize (0.5.8)
+    concurrent-ruby (1.1.5)
     coveralls (0.6.2)
       colorize
       multi_json (~> 1.3)
@@ -17,7 +18,8 @@ GEM
     diff-lcs (1.1.3)
     faker (0.9.5)
       i18n (~> 0.4)
-    i18n (0.6.4)
+    i18n (0.9.5)
+      concurrent-ruby (~> 1.0)
     mime-types (1.21)
     multi_json (1.7.1)
     rake (10.0.3)