diff --git a/RailsConf16/Gemfile.lock b/RailsConf16/Gemfile.lock
index 0880969..cd388b1 100644
--- a/RailsConf16/Gemfile.lock
+++ b/RailsConf16/Gemfile.lock
@@ -26,6 +26,7 @@ GEM
       extlib (>= 0.9.15)
       multi_json (>= 1.0.0)
     beefcake (1.1.0)
+    concurrent-ruby (1.1.10)
     digest-crc (0.4.1)
     extlib (0.9.16)
     faraday (0.9.2)
@@ -53,7 +54,8 @@ GEM
     grpc (0.13.1)
       google-protobuf (~> 3.0.0.alpha.5.0.3)
       googleauth (~> 0.5.1)
-    i18n (0.7.0)
+    i18n (0.9.5)
+      concurrent-ruby (~> 1.0)
     json (1.8.3)
     jwt (1.5.4)
     launchy (2.4.3)