diff --git a/cookbooks/prometheus-exporters/attributes.rb b/cookbooks/prometheus-exporters/attributes.rb
index 221f13f..d39fc78 100644
--- a/cookbooks/prometheus-exporters/attributes.rb
+++ b/cookbooks/prometheus-exporters/attributes.rb
@@ -2,14 +2,6 @@
 # Specifying the default settings:
 # -------------------------------------------
 node.reverse_merge!({
-  'prometheus' => {
-    'manager' => false,
-    'url' => 'https://github.com/prometheus/prometheus/releases/download/',
-    'prefix' => 'prometheus-',
-    'postfix' => '.linux-amd64.tar.gz',
-    'storage' => '/opt/prometheus/',
-    'location' => '/usr/local/bin/'
-  },
   'node_exporter' => {
     'url' => 'https://github.com/prometheus/node_exporter/releases/download/',
     'prefix' => 'node_exporter-',
@@ -24,20 +16,6 @@ node.reverse_merge!({
     'storage' => '/opt/blackbox_exporter/bin/',
     'location' => '/usr/local/bin/'
   },
-  'alertmanager' => {
-    'url' => 'https://github.com/prometheus/alertmanager/releases/download/',
-    'prefix' => 'alertmanager-',
-    'postfix' => '.linux-amd64.tar.gz',
-    'storage' => '/opt/prometheus/',
-    'location' => '/usr/local/bin/'
-  },
-  'alertmanager_webhook' => {
-    'url' => 'https://github.com/tomtom-international/alertmanager-webhook-logger/releases/download/',
-    'prefix' => 'alertmanager-webhook-logger-',
-    'postfix' => '.tar.gz',
-    'storage' => '/opt/prometheus/',
-    'location' => '/usr/local/bin/'
-  },
   'filestat_exporter' => {
     'url' => 'https://github.com/michael-doubez/filestat_exporter/releases/download/',
     'prefix' => 'filestat_exporter-',
diff --git a/cookbooks/prometheus/alertmanager_webhook_install.rb b/cookbooks/prometheus/alertmanager_webhook_install.rb
index 23f48bc..0420e26 100644
--- a/cookbooks/prometheus/alertmanager_webhook_install.rb
+++ b/cookbooks/prometheus/alertmanager_webhook_install.rb
@@ -35,7 +35,9 @@ directory node['alertmanager_webhook']['storage'] do
   mode '755'
 end
 
-execute "tar zxf #{TMP} -C #{node['alertmanager_webhook']['storage']}"
+execute "unzip #{TMP} -d #{node['alertmanager_webhook']['storage']}" do
+  not_if "test -e #{node['alertmanager_webhook']['storage']}alertmanager-webhook-logger"
+end
 
 # Change Owner and Permissions:
 file "#{node['alertmanager_webhook']['storage']}alertmanager-webhook-logger" do
diff --git a/cookbooks/prometheus/attributes.rb b/cookbooks/prometheus/attributes.rb
index 3c90455..a671089 100644
--- a/cookbooks/prometheus/attributes.rb
+++ b/cookbooks/prometheus/attributes.rb
@@ -34,7 +34,7 @@ node.reverse_merge!({
   'alertmanager_webhook' => {
     'url' => 'https://github.com/tomtom-international/alertmanager-webhook-logger/releases/download/',
     'prefix' => 'alertmanager-webhook-logger-',
-    'postfix' => '.tar.gz',
+    'postfix' => '.zip',
     'storage' => '/opt/prometheus/',
     'location' => '/usr/local/bin/'
   },