diff --git a/Gemfile.lock b/Gemfile.lock
index 2b6929f52..bec84d54c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -101,7 +101,7 @@ GEM
       method_source (~> 1.0)
     psych (3.1.0)
     racc (1.6.0)
-    rack (2.2.3)
+    rack (2.2.3.1)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
     rails-dom-testing (2.0.3)