diff --git a/conyac/Gemfile.lock b/conyac/Gemfile.lock
index 71f128b..19ddec8 100644
--- a/conyac/Gemfile.lock
+++ b/conyac/Gemfile.lock
@@ -7,7 +7,9 @@ GEM
       minitest (~> 5.1)
       thread_safe (~> 0.3, >= 0.3.4)
       tzinfo (~> 1.1)
-    i18n (0.7.0)
+    concurrent-ruby (1.1.10)
+    i18n (0.9.5)
+      concurrent-ruby (~> 1.0)
     json (1.8.3)
     minitest (5.7.0)
     thread_safe (0.3.5)