diff --git a/Gemfile.lock b/Gemfile.lock
index 863413d..c25c482 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -18,7 +18,7 @@ GEM
     i18n (0.8.6)
     minitest (5.10.3)
     pg (0.21.0)
-    rack (1.6.4)
+    rack (1.6.13)
     rack-protection (1.5.3)
       rack
     rack-test (0.6.3)