diff --git a/.travis.yml b/.travis.yml
index 4c2df32648849f166d14f160a683968cf0672838..92d25c3421054b0ca6e5598bf2e05f6b44f589eb 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -21,6 +21,8 @@ matrix:
     env: PUPPET_GEM_VERSION="~> 3.0" FUTURE_PARSER="yes"
   - rvm: 2.1.9
     env: PUPPET_GEM_VERSION="~> 4.5.0"
+  - rvm: 2.3.1
+    env: PUPPET_GEM_VERSION="~> 4"
   - rvm: default
     sudo: required
     dist: trusty
diff --git a/metadata.json b/metadata.json
index c261032d2fb3631eae4ace9395374b309aa4b422..bc43b3cc15107798b8d8df38338bae58bfecad60 100644
--- a/metadata.json
+++ b/metadata.json
@@ -8,6 +8,9 @@
   "project_page": "https://github.com/camptocamp/puppet-postfix",
   "issues_url": "https://github.com/camptocamp/puppet-postfix/issues",
   "description": "Postfix Module for Puppet",
+  "requirements": [
+    {"name":"puppet","version_requirement":">= 3.0.0 < 5.0.0" }
+  ],
   "dependencies": [
     {
       "name": "puppetlabs/stdlib",