diff --git a/Gemfile.lock b/Gemfile.lock
index 4825e70..dc5fb68 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -72,7 +72,7 @@ GEM
       ast (~> 2.2)
     powerpack (0.1.1)
     procto (0.0.3)
-    rack (1.6.4)
+    rack (1.6.13)
     rainbow (2.1.0)
     rake (11.0.1)
     rspec (3.4.0)