diff --git a/Gemfile.lock b/Gemfile.lock
index 7a88679..94cbea0 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -102,7 +102,7 @@ GEM
       activesupport (>= 3.1)
     parallel (1.10.0)
     public_suffix (2.0.5)
-    rack (2.0.1)
+    rack (2.2.3)
     rack-livereload (0.3.16)
       rack
     rb-fsevent (0.9.8)