diff --git a/external_modules.txt b/external_modules.txt
index a6f06d0fe..56033e628 100644
--- a/external_modules.txt
+++ b/external_modules.txt
@@ -2,7 +2,7 @@ voxpupuli/puppet-kmod
 puppetlabs/puppetlabs-apache
 puppetlabs/puppetlabs-apt,v9.0.2
 puppetlabs/puppetlabs-concat
-puppetlabs/puppetlabs-firewall
+puppetlabs/puppetlabs-firewall,v6.0.0
 puppetlabs/puppetlabs-inifile
 puppetlabs/puppetlabs-mysql,v14.0.0
 puppetlabs/puppetlabs-postgresql