diff --git a/fixtures/fake_appdynamics_service_broker/Gemfile.lock b/fixtures/fake_appdynamics_service_broker/Gemfile.lock
index ba86047c..955cf8a8 100644
--- a/fixtures/fake_appdynamics_service_broker/Gemfile.lock
+++ b/fixtures/fake_appdynamics_service_broker/Gemfile.lock
@@ -1,7 +1,7 @@
 GEM
   remote: http://rubygems.org/
   specs:
-    rack (2.2.2)
+    rack (3.0.4.1)
     roda (3.1.0)
       rack