diff --git a/Gemfile.lock b/Gemfile.lock
index f2e66a2..09ef659 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -26,7 +26,7 @@ GEM
     prawn-fillform (0.0.14)
       prawn
     props (1.0.0)
-    rack (1.4.1)
+    rack (1.6.11)
     rack-protection (1.2.0)
       rack
     rack-test (0.6.2)