diff --git a/Gemfile.lock b/Gemfile.lock
index 884b157..3c86de0 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -85,7 +85,7 @@ GEM
     polyglot (0.3.3)
     puma (1.6.3)
       rack (~> 1.2)
-    rack (1.4.4)
+    rack (1.4.5)
     rack-cache (1.2)
       rack (>= 0.4)
     rack-pjax (0.7.0)