diff --git a/manifests/init.pp b/manifests/init.pp
index 910ecce..bb818dd 100644
--- a/manifests/init.pp
+++ b/manifests/init.pp
@@ -14,13 +14,14 @@
 # @param virtualenv_path Optional[String] If we use virtualenv (false if undef) and what path we use as base, default undef
 # @param package_name [String] Package name of the thumbor application as found in pip, default thumbor
 # @param package_ensure Enum['present', 'absent', 'latest'] Control the ensure on pip, default $ensure ('present')
-# @param pip_proxyserver Variant[Boolean, String] The full url (including credentials) to a proxy server or false to not use one at all, default false
+# @param pip_proxyserver Optional[String] The full url (including credentials) to a proxy server or undef to not use one at all, default undef
 # @param ensure_user [Boolean] If we control the installation of the user, default true
 # @param user [String] Name of the user to install (optional) and under which we run the thumbor service, default thumbor
 # @param ensure_group [Boolean] If we control the installation of the group, default true
 # @param group [String] Name of the group to install (optional) and under which we run the thumbor service, default thumbor
 # @param extensions Variant[Array[String],String] Extentions to install in thumbor virtual environment, default []
 # @param additional_packages [Array] Specifies a list of additional packages that are required for thumbor or any of it's dependencies.
+# @param manage_python [Boolean] If we control the installation of Python, default true
 #
 #
 class thumbor (
@@ -32,13 +33,14 @@
   Optional[String]                    $virtualenv_path     = $thumbor::params::virtualenv_path,
   String                              $package_name        = $thumbor::params::package_name,
   Enum['present', 'absent', 'latest'] $package_ensure      = $thumbor::params::package_ensure,
-  Variant[Boolean, String]            $pip_proxyserver     = $thumbor::params::pip_proxyserver,
+  Optional[String]                    $pip_proxyserver     = $thumbor::params::pip_proxyserver,
   Boolean                             $ensure_user         = $thumbor::params::ensure_user,
   String                              $user                = $thumbor::params::user,
   Boolean                             $ensure_group        = $thumbor::params::ensure_group,
   String                              $group               = $thumbor::params::group,
   Variant[Array[String],String]       $extentions          = $thumbor::params::extentions,
   Array                               $additional_packages = $thumbor::params::additional_packages,
+  Boolean                             $manage_python       = $thumbor::params::manage_python,
 ) inherits thumbor::params
 {
   $apppath = $virtualenv_path ? {
diff --git a/manifests/install.pp b/manifests/install.pp
index 18cbbe9..54ae6d3 100644
--- a/manifests/install.pp
+++ b/manifests/install.pp
@@ -33,12 +33,14 @@
     }
   }
 
-  class { 'python' :
-    version    => 'system',
-    pip        => 'present',
-    dev        => 'present',
-    virtualenv => 'present',
-    require    => Anchor['thumbor::install::begin'],
+  if $thumbor::manage_python {
+    class { 'python' :
+      version    => 'system',
+      pip        => 'present',
+      dev        => 'present',
+      virtualenv => 'present',
+      require    => Anchor['thumbor::install::begin'],
+    }
   }
 
   if $thumbor::virtualenv_path {
@@ -46,7 +48,7 @@
     python::virtualenv { $thumbor::virtualenv_path:
       ensure  => $thumbor::ensure,
       version => 'system',
-      proxy   => $thumbor::proxy,
+      proxy   => $thumbor::pip_proxyserver,
       owner   => $thumbor::user,
       group   => $thumbor::group,
       require => [ Class['python'] ],
diff --git a/manifests/params.pp b/manifests/params.pp
index 4566bf9..646cae5 100644
--- a/manifests/params.pp
+++ b/manifests/params.pp
@@ -8,13 +8,14 @@
   Optional[String]              $virtualenv_path  = undef,
   String                        $package_name     = 'thumbor',
   String                        $package_ensure   = $ensure,
-  Variant[Boolean, String]      $pip_proxyserver  = false,
+  Optional[String]              $pip_proxyserver  = undef,
   Boolean                       $ensure_user      = true,
   String                        $user             = 'thumbor',
   Boolean                       $ensure_group     = true,
   String                        $group            = 'thumbor',
   Variant[Array[String],String] $extentions       = [],
   Hash                          $default_options  = {},
+  Boolean                       $manage_python    = true,
 )
 {
   case $facts['os']['family'] {
diff --git a/metadata.json b/metadata.json
index 005462f..30bde68 100644
--- a/metadata.json
+++ b/metadata.json
@@ -10,15 +10,15 @@
   "dependencies": [
     {
       "name": "puppetlabs/stdlib",
-      "version_requirement": ">= 1.0.0"
+      "version_requirement": ">= 4.0.0 < 7.0.0"
     },
     {
       "name": "puppet/python",
-      "version_requirement": ">= 1.12.0 < 3.0.0"
+      "version_requirement": ">= 3.0.0 < 4.0.0"
     },
     {
       "name": "camptocamp/systemd",
-      "version_requirement": ">= 1.0.0 < 3.0.0"
+      "version_requirement": ">= 2.0.0 < 3.0.0"
     }
   ],
   "data_provider": null