diff --git a/Gemfile.lock b/Gemfile.lock
index 011b4adf..f9b13c55 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -417,7 +417,7 @@ GEM
       multi_json (~> 1.0)
       rack (~> 1.0)
       tilt (~> 1.1, != 1.3.0)
-    stamp (0.3.0)
+    stamp (0.5.0)
     state_machine (1.1.2)
     temple (0.5.5)
     test_after_commit (0.0.1)