diff --git a/Gemfile.lock b/Gemfile.lock
index e7b3515..5897a5a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -15,6 +15,7 @@ GEM
       thor
     coderay (1.0.9)
     colored (1.2)
+    concurrent-ruby (1.1.5)
     cri (2.4.0)
       colored (>= 1.2)
     ffi (1.9.0)
@@ -28,7 +29,8 @@ GEM
     guard-nanoc (1.0.1)
       guard (>= 1.8.0)
       nanoc (>= 3.6.3)
-    i18n (0.6.5)
+    i18n (0.9.5)
+      concurrent-ruby (~> 1.0)
     listen (1.3.1)
       rb-fsevent (>= 0.9.3)
       rb-inotify (>= 0.9)