diff --git a/examples/gulp/Gemfile.lock b/examples/gulp/Gemfile.lock
index 45885e6..13409d9 100644
--- a/examples/gulp/Gemfile.lock
+++ b/examples/gulp/Gemfile.lock
@@ -2,7 +2,7 @@ PATH
   remote: ../..
   specs:
     npm-pipeline-rails (1.1.3)
-      railties (~> 4.0)
+      railties (>= 4.0.0, < 6.0.0)
       sprockets (~> 3.5)
 
 GEM
@@ -87,7 +87,7 @@ GEM
       activesupport (= 4.2.6)
       rake (>= 0.8.7)
       thor (>= 0.18.1, < 2.0)
-    rake (11.1.1)
+    rake (13.0.1)
     sprockets (3.5.2)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)