diff --git a/Gemfile.lock b/Gemfile.lock
index 8e7e141..a128f00 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -94,7 +94,7 @@ GEM
       activesupport (>= 3.1)
     parallel (1.12.1)
     public_suffix (3.0.2)
-    rack (2.0.5)
+    rack (2.2.3)
     rack-livereload (0.3.17)
       rack
     rb-fsevent (0.10.3)