diff --git a/Gemfile.lock b/Gemfile.lock
index 5f8ec24..73c9e34 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -224,7 +224,7 @@ GEM
       pry (>= 0.10.4)
     psych (3.1.0)
     public_suffix (3.0.3)
-    rack (2.0.6)
+    rack (2.2.3)
     rack-contrib (2.1.0)
       rack (~> 2.0)
     rack-livereload (0.3.17)