diff --git a/.travis.yml b/.travis.yml
index 749f64be..1ad7b7b1 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -23,11 +23,14 @@ env:
     - PUPPET_GEM_VERSION="~> 4.0.0"
     - PUPPET_GEM_VERSION="~> 4.1.0"
     - PUPPET_GEM_VERSION="~> 4.2.0"
+    - PUPPET_GEM_VERSION="~> 4.3.0"
+    - PUPPET_GEM_VERSION="~> 4.4.0"
+    - PUPPET_GEM_VERSION="~> 4.5.0"
     - PUPPET_GEM_VERSION="~> 4"
 
 sudo: false
 
-script: 'bundle exec metadata-json-lint metadata.json && bundle exec rake validate && bundle exec rake lint && SPEC_OPTS="--format documentation" bundle exec rake spec'
+script: 'bundle exec rake validate && bundle exec rake lint && SPEC_OPTS="--format documentation" bundle exec rake spec'
 
 matrix:
   fast_finish: true
@@ -48,6 +51,12 @@ matrix:
       env: PUPPET_GEM_VERSION="~> 4.1.0"
     - rvm: 1.8.7
       env: PUPPET_GEM_VERSION="~> 4.2.0"
+    - rvm: 1.8.7
+      env: PUPPET_GEM_VERSION="~> 4.3.0"
+    - rvm: 1.8.7
+      env: PUPPET_GEM_VERSION="~> 4.4.0"
+    - rvm: 1.8.7
+      env: PUPPET_GEM_VERSION="~> 4.5.0"
     - rvm: 1.8.7
       env: PUPPET_GEM_VERSION="~> 4"
 
diff --git a/Gemfile b/Gemfile
index f5b005b8..7dc524db 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,7 +3,7 @@ source ENV['GEM_SOURCE'] || "https://rubygems.org"
 group :development, :test do
   gem 'metadata-json-lint',      :require => false
   gem 'rspec-puppet',            :require => false
-  gem 'puppetlabs_spec_helper',  :require => false
+  gem 'puppetlabs_spec_helper', '>= 1.1.1'
   gem 'puppet-lint',             :require => false
   gem 'pry',                     :require => false
   gem 'simplecov',               :require => false
@@ -18,7 +18,12 @@ else
 end
 
 if RUBY_VERSION >= '1.8.7' and RUBY_VERSION < '2.0'
-  gem 'json', '~> 1.0'
+  # json 2.x requires ruby 2.0. Lock to 1.8
+  gem 'json', '~> 1.8'
+  # json_pure 2.0.2 requires ruby 2.0. Lock to 2.0.1
+  gem 'json_pure', '= 2.0.1'
+else
+  gem 'json'
 end
 
 if facterversion = ENV['FACTER_GEM_VERSION']
diff --git a/manifests/install.pp b/manifests/install.pp
index 69fde060..95e7009e 100644
--- a/manifests/install.pp
+++ b/manifests/install.pp
@@ -18,7 +18,7 @@
   $python = $::python::version ? {
     'system' => 'python',
     'pypy'   => 'pypy',
-    default  => "${python::version}",
+    default  => "${python::version}", # lint:ignore:only_variable_string
   }
 
   $pythondev = $::osfamily ? {
@@ -220,8 +220,8 @@
     }
 
     package { 'gunicorn':
-      name   => $python::gunicorn_package_name,
       ensure => $gunicorn_ensure,
+      name   => $python::gunicorn_package_name,
     }
   }
 }
diff --git a/spec/defines/pip_spec.rb b/spec/defines/pip_spec.rb
index d603edc8..e03fd7f1 100644
--- a/spec/defines/pip_spec.rb
+++ b/spec/defines/pip_spec.rb
@@ -48,7 +48,7 @@
       context "adds proxy to search command if set to latest" do
         let (:params) {{ :proxy => "http://my.proxy:3128", :ensure => 'latest' }}
         it { is_expected.to contain_exec("pip_install_rpyc").with_command("pip wheel --help > /dev/null 2>&1 && { pip wheel --version > /dev/null 2>&1 || wheel_support_flag='--no-use-wheel'; } ; { pip --log /tmp/pip.log install --upgrade $wheel_support_flag  --proxy=http://my.proxy:3128   rpyc || pip --log /tmp/pip.log install --upgrade  --proxy=http://my.proxy:3128   rpyc ;}") }
-        it { is_expected.to contain_exec("pip_install_rpyc").with_unless('pip search --proxy=http://my.proxy:3128 rpyc | grep -i INSTALLED | grep -i latest') }
+        it { is_expected.to contain_exec("pip_install_rpyc").with_unless('pip search  --proxy=http://my.proxy:3128 rpyc | grep -i INSTALLED.*latest') }
       end
     end