diff --git a/Gemfile.lock b/Gemfile.lock
index 9ad42c6..03bb75b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -91,7 +91,7 @@ GEM
       activesupport (>= 3.1)
     parallel (1.12.1)
     public_suffix (3.0.2)
-    rack (2.0.4)
+    rack (2.2.3)
     rack-livereload (0.3.16)
       rack
     rb-fsevent (0.10.3)