diff --git a/spec/dummy4/Gemfile.lock b/spec/dummy4/Gemfile.lock
index bc0019d5..4ea88ce4 100644
--- a/spec/dummy4/Gemfile.lock
+++ b/spec/dummy4/Gemfile.lock
@@ -159,7 +159,7 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.8.1)
       slop (~> 3.4)
-    rack (1.6.4)
+    rack (1.6.13)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (4.2.3)