diff --git a/Gemfile.lock b/Gemfile.lock
index 6a1c369..0ffc725 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -120,7 +120,7 @@ GEM
       activesupport (>= 3.1)
     parallel (1.9.0)
     pkg-config (1.1.7)
-    rack (1.6.4)
+    rack (1.6.13)
     rack-livereload (0.3.16)
       rack
     rake (11.2.2)