diff --git a/selene/Gemfile.lock b/selene/Gemfile.lock
index 3573d545..2193cf95 100644
--- a/selene/Gemfile.lock
+++ b/selene/Gemfile.lock
@@ -61,7 +61,7 @@ GEM
       sprockets-helpers (~> 1.0.0)
       sprockets-sass (~> 1.0.0)
     multi_json (1.8.2)
-    rack (1.5.2)
+    rack (1.6.12)
     rack-livereload (0.3.15)
       rack
     rack-test (0.6.2)