diff --git a/Gemfile.lock b/Gemfile.lock
index aa3a9a6..a49e4f1 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -86,7 +86,7 @@ GEM
       activesupport (>= 3.1)
     parallel (1.20.1)
     public_suffix (4.0.6)
-    rack (2.2.3)
+    rack (2.2.6.4)
     rack-livereload (0.3.17)
       rack
     rb-fsevent (0.10.4)