diff --git a/.travis.yml b/.travis.yml
index f719a36..6071486 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,29 +1,32 @@
 ---
 sudo: false
 dist: trusty
 language: ruby
 cache: bundler
 
 before_install:
   - bundle -v
   - rm Gemfile.lock || true
   - gem update --system
   - gem update bundler
   - gem --version
   - bundle -v
 
 script:
   - 'bundle exec rake test'
 
 matrix:
   fast_finish: true
   include:
     - rvm: 2.4.1
       bundler_args: --without system_tests
       env: PUPPET_GEM_VERSION="~> 6.0"
     - rvm: 2.4.1
       bundler_args: --without system_tests
       env: PUPPET_GEM_VERSION="~> 5.0"
     - rvm: 2.4.1
       bundler_args: --without system_tests
       env: PUPPET_GEM_VERSION="~> 4.0"
+    - rvm: 2.3.1
+      bundler_args: --without system_tests
+      env: PUPPET_GEM_VERSION="~> 4.0"