diff --git a/Gemfile.lock b/Gemfile.lock
index 08508738..51dc1e65 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -36,7 +36,7 @@ GEM
     pdf-writer (1.1.8)
       color (>= 1.4.0)
       transaction-simple (~> 1.3)
-    rack (1.1.0)
+    rack (1.1.6)
     rack-debug (1.4.2)
       rack (>= 1.0)
       ruby-debug (>= 0.10)