diff --git a/Gemfile.lock b/Gemfile.lock
index ad70917..4b5c1be 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -129,7 +129,7 @@ GEM
     pronto-scss (0.6.0)
       pronto (~> 0.6.0)
       scss_lint (~> 0.43, >= 0.43.0)
-    rack (1.6.4)
+    rack (1.6.13)
     rack-livereload (0.3.16)
       rack
     rainbow (2.1.0)