diff --git a/Tests/Server/Gemfile.lock b/Tests/Server/Gemfile.lock
index 19d42e5..64b2ab0 100644
--- a/Tests/Server/Gemfile.lock
+++ b/Tests/Server/Gemfile.lock
@@ -15,7 +15,7 @@ GEM
       coderay (~> 1.0.5)
       method_source (~> 0.8)
       slop (~> 3.4)
-    rack (1.5.2)
+    rack (1.6.13)
     rack-protection (1.5.0)
       rack
     rack-test (0.5.7)