diff --git a/Gemfile.lock b/Gemfile.lock
index 5dcb9dda..05f8297b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -85,7 +85,7 @@ GEM
     public_suffix (3.0.2)
     pygments.rb (1.2.1)
       multi_json (>= 1.0.0)
-    rack (2.0.4)
+    rack (2.2.6.4)
     rake (12.3.0)
     rb-fsevent (0.10.2)
     rb-inotify (0.9.10)