diff --git a/Gemfile.lock b/Gemfile.lock
index f848eec..9b3fce5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -63,7 +63,7 @@ GEM
       rake (>= 0.8.1)
     pdfkit (0.5.2)
     polyglot (0.3.3)
-    rack (1.4.1)
+    rack (1.4.7)
     rack-cache (1.2)
       rack (>= 0.4)
     rack-ssl (1.3.2)