diff --git a/Gemfile.lock b/Gemfile.lock
index 4196f32..05fbcb0 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -76,7 +76,7 @@ GEM
       mime-types
       mimemagic (= 0.3.0)
     pg (0.18.3)
-    rack (1.6.4)
+    rack (1.6.12)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (4.2.4)