diff --git a/Gemfile.lock b/Gemfile.lock
index 2a818a5..778281a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -31,9 +31,11 @@ GEM
       tzinfo (~> 1.1)
     arel (5.0.1.20140414130214)
     builder (3.2.2)
+    concurrent-ruby (1.1.10)
     erubis (2.7.0)
     hike (1.2.3)
-    i18n (0.6.11)
+    i18n (0.9.5)
+      concurrent-ruby (~> 1.0)
     json (1.8.1)
     mail (2.5.4)
       mime-types (~> 1.16)