diff --git a/Gemfile.lock b/Gemfile.lock
index 51cc295..8c40bf6 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -143,7 +143,7 @@ GEM
     pmap (1.0.2)
     quotation-marks (0.1.1)
       sass (>= 3.3)
-    rack (1.6.1)
+    rack (1.6.12)
     rack-livereload (0.3.15)
       rack
     rack-test (0.6.3)