diff --git a/Gemfile.lock b/Gemfile.lock
index 2ec65fea..9d1927f6 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -215,7 +215,7 @@ GEM
       mime-types
     polyglot (0.3.3)
     posix-spawn (0.3.6)
-    rack (1.4.1)
+    rack (1.4.7)
     rack-cache (1.2)
       rack (>= 0.4)
     rack-openid (1.3.1)