diff --git a/Gemfile.lock b/Gemfile.lock
index bacf012..709721d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -200,7 +200,7 @@ GEM
       method_source
       rake (>= 0.8.7)
       thor (>= 0.18.1, < 2.0)
-    rainbow (2.1.0)
+    rainbow (2.2.1)
     rake (12.0.0)
     rb-fsevent (0.9.8)
     rb-inotify (0.9.7)