diff --git a/Gemfile.lock b/Gemfile.lock
index e0a2f56..4e89143 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -36,7 +36,8 @@ GEM
     diff-lcs (1.3)
     docile (1.1.5)
     erubis (2.7.0)
-    i18n (0.7.0)
+    i18n (0.9.5)
+      concurrent-ruby (~> 1.0)
     json (2.0.3)
     loofah (2.0.3)
       nokogiri (>= 1.5.9)