diff --git a/Puppetfile b/Puppetfile
index e5d811dec..ffbeaad1c 100644
--- a/Puppetfile
+++ b/Puppetfile
@@ -180,7 +180,7 @@ mod 'apt',
 
 mod 'concat',
   :git => 'https://github.com/puppetlabs/puppetlabs-concat',
-  :ref => '3.0.0'
+  :ref => '4.0.0'
 
 mod 'firewall',
   :git => 'https://github.com/puppetlabs/puppetlabs-firewall',