diff --git a/Gemfile.lock b/Gemfile.lock
index ead2be3..f4b7d34 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -115,7 +115,7 @@ GEM
     open4 (1.3.4)
     orm_adapter (0.5.0)
     promise.rb (0.6.1)
-    rack (1.6.4)
+    rack (1.6.13)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (4.2.4)