diff --git a/Gemfile.lock b/Gemfile.lock
index dafc142..b371897 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -34,10 +34,12 @@ GEM
     arel (4.0.2)
     atomic (1.1.15)
     builder (3.1.4)
+    concurrent-ruby (1.1.10)
     diff-lcs (1.2.5)
     erubis (2.7.0)
     hike (1.2.3)
-    i18n (0.6.9)
+    i18n (0.9.5)
+      concurrent-ruby (~> 1.0)
     mail (2.5.4)
       mime-types (~> 1.16)
       treetop (~> 1.4.8)