diff --git a/Gemfile.lock b/Gemfile.lock
index 3a4025d..b3e13dc 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -110,7 +110,7 @@ GEM
       mime-types
       mimemagic (~> 0.3.0)
     pg (0.21.0)
-    rack (1.6.8)
+    rack (1.6.13)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (4.2.5)