diff --git a/Gemfile.lock b/Gemfile.lock
index c03650ce..6f4282d1 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -186,7 +186,7 @@ GEM
       omniauth (~> 1.2.0)
     pg (0.18.4)
     pothoven-attachment_fu (3.2.16)
-    rack (1.6.4)
+    rack (1.6.12)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (4.2.5)