diff --git a/Gemfile.lock b/Gemfile.lock
index 791aee3..33e1e4f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -77,7 +77,7 @@ GEM
       mini_portile (= 0.6.0)
     ntlm-http (0.1.1)
     pg (0.15.1)
-    rack (1.5.2)
+    rack (1.5.5)
     rack-test (0.6.2)
       rack (>= 1.0)
     rack-timeout (0.0.4)