diff --git a/Gemfile.lock b/Gemfile.lock
index 0c3d150..89db3a5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -13,7 +13,9 @@ GEM
       rake
     bcrypt-ruby (3.0.0)
     builder (3.0.0)
-    i18n (0.6.0)
+    concurrent-ruby (1.1.5)
+    i18n (0.9.5)
+      concurrent-ruby (~> 1.0)
     mocha (0.9.12)
     multi_json (1.0.3)
     rake (0.8.7)