diff --git a/Gemfile.lock b/Gemfile.lock
index ac755df..b1c9b78 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -21,8 +21,10 @@ GEM
     bson (1.3.1)
     bson_ext (1.3.1)
     builder (3.0.0)
+    concurrent-ruby (1.1.10)
     diff-lcs (1.1.2)
-    i18n (0.6.0)
+    i18n (0.9.5)
+      concurrent-ruby (~> 1.0)
     mongo (1.3.1)
       bson (>= 1.3.1)
     mongo_mapper (0.9.1)