diff --git a/Gemfile.lock b/Gemfile.lock
index 8e0011d..5712e00 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -88,7 +88,7 @@ GEM
       multi_json (~> 1.3)
       multi_xml (~> 0.5)
       rack (~> 1.2)
-    rack (1.6.4)
+    rack (1.6.13)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (4.2.4)