diff --git a/manifests/config.pp b/manifests/config.pp
index e81e65f..fb98462 100644
--- a/manifests/config.pp
+++ b/manifests/config.pp
@@ -11,12 +11,14 @@
     group => $aptly::group,
   }
 
+  $config = deep_merge($aptly::properties, $aptly::params::properties)
+
   file { $aptly::config_filepath:
     ensure  => file,
-    content => template('aptly/aptly.conf.erb'),
+    content => to_json_pretty($config),
   }
 
-  file { $aptly::root_dir:
+  file { $config['rootDir']:
     ensure  => directory,
     mode    => '0644',
     recurse => $aptly::recurse_root_dir,
diff --git a/manifests/init.pp b/manifests/init.pp
index c7d25cd..9551f3b 100644
--- a/manifests/init.pp
+++ b/manifests/init.pp
@@ -19,13 +19,7 @@
   $uid                  = $aptly::params::uid,
   $group                = $aptly::params::group,
   $gid                  = $aptly::params::gid,
-  $root_dir             = $aptly::params::root_dir,
-  $architectures        = $aptly::params::architectures,
-  $ppa_dist             = $aptly::params::ppa_dist,
-  $ppa_codename         = $aptly::params::ppa_codename,
   $properties           = $aptly::params::properties,
-  $s3_publish_endpoints = $aptly::params::s3_publish_endpoints,
-  $swift_publish_endpoints = $aptly::params::swift_publish_endpoints,
   $enable_api           = $aptly::params::enable_api,
   $api_port             = $aptly::params::api_port,
   $api_bind             = $aptly::params::api_bind,
@@ -44,8 +38,7 @@
     $repo_keyserver,
     $config_filepath,
     $user,
-    $group,
-    $root_dir)
+    $group)
   if ! is_integer($uid) { fail("invalid ${uid} provided") }
   if ! is_integer($gid) { fail("invalid ${gid} provided") }
   validate_re($repo_key, '^[A-F0-9]+$')
@@ -55,10 +48,7 @@
     $enable_api,
     $api_nolock,
     $recurse_root_dir)
-  validate_array($architectures)
   validate_hash($properties)
-  validate_hash($s3_publish_endpoints)
-  validate_hash($swift_publish_endpoints)
   validate_integer($port, 49150)
   validate_integer($api_port, 49150)
   validate_re(
diff --git a/manifests/params.pp b/manifests/params.pp
index d2f73ad..10a67e1 100644
--- a/manifests/params.pp
+++ b/manifests/params.pp
@@ -20,23 +20,14 @@
   $uid             = 450
   $group           = 'aptly'
   $gid             = 450
-  $root_dir        = '/var/aptly'
-  $architectures   = [$::architecture]
-  $ppa_dist        = 'ubuntu'
-  $ppa_codename    = ''
   $properties      = {
-    'downloadConcurrency'         => 4,
-    'downloadSpeedLimit'          => 0,
-    'dependencyFollowSuggests'    => false,
-    'dependencyFollowRecommends'  => false,
-    'dependencyFollowAllVariants' => false,
-    'dependencyFollowSource'      => false,
-    'gpgDisableSign'              => false,
-    'gpgDisableVerify'            => false,
-    'downloadSourcePackages'      => false,
-    }
-  $s3_publish_endpoints = {}
-  $swift_publish_endpoints = {}
+    'rootDir'               => '/var/aptly',
+    'architectures'         => [$::architecture],
+    'ppaDistributorID'      => 'ubuntu',
+    'ppaCodename'           => '',
+    'S3PublishEndpoints'    => {},
+    'SwiftPublishEndpoints' => {},
+  }
   $enable_api           = false
   $api_port             = 8081
   $api_bind             = '0.0.0.0'
diff --git a/metadata.json b/metadata.json
index 89d8147..931a0c2 100644
--- a/metadata.json
+++ b/metadata.json
@@ -25,7 +25,7 @@
   "dependencies": [
     {
       "name": "puppetlabs/stdlib",
-      "version_requirement": ">= 4.0.0 < 5.0.0"
+      "version_requirement": ">= 4.24.0 < 5.0.0"
     },
     {
       "name": "puppetlabs/apt",
diff --git a/templates/aptly.conf.erb b/templates/aptly.conf.erb
index 5026c14..f9c8fd8 100644
--- a/templates/aptly.conf.erb
+++ b/templates/aptly.conf.erb
@@ -1,9 +1,7 @@
 {
   "rootDir": "<%= scope.lookupvar('aptly::root_dir') -%>",
   "architectures": ["<%= scope.lookupvar('aptly::architectures').join('", "') %>"],
-<% scope.lookupvar('aptly::properties').each do |k, v| -%>
-  "<%= k -%>": <%= v %>,
-<% end -%>
+<%= scope.lookupvar('aptly::properties').to_pson -%>,
   "ppaDistributorID": "<%= scope.lookupvar('aptly::ppa_dist') %>",
   "ppaCodename": "<%= scope.lookupvar('aptly::ppa_codename') %>",
   "S3PublishEndpoints": <%= scope.lookupvar('aptly::s3_publish_endpoints').to_pson %>,