diff --git a/task_spec/spec/acceptance/init_spec.rb b/task_spec/spec/acceptance/init_spec.rb
index 15a6ec7b..409684fc 100644
--- a/task_spec/spec/acceptance/init_spec.rb
+++ b/task_spec/spec/acceptance/init_spec.rb
@@ -48,6 +48,16 @@ def latest_platform_list
     }x
   end
 
+  # This method lists sources to be used when installing packages that haven't been released yet (see above).
+  def latest_sources
+    {
+      'yum_source'     => 'https://artifactory.delivery.puppetlabs.net:443/artifactory/internal_nightly__local/yum',
+      'apt_source'     => 'https://artifactory.delivery.puppetlabs.net:443/artifactory/internal_nightly__local/apt',
+      'mac_source'     => 'https://artifactory.delivery.puppetlabs.net:443/artifactory/internal_nightly__local/downloads',
+      'windows_source' => 'https://artifactory.delivery.puppetlabs.net:443/artifactory/internal_nightly__local/downloads',
+    }
+  end
+
   it 'works with version and install tasks' do
     case target_platform
     when latest_platform_list
@@ -57,7 +67,7 @@ def latest_platform_list
       # Install an puppet8 nightly version
       results = run_task('puppet_agent::install', 'target', { 'collection' => 'puppet8-nightly',
                                                               'version' => 'latest',
-                                                              'stop_service' => true })
+                                                              'stop_service' => true }.merge(latest_sources))
 
       results.each do |result|
         logger.info("Installed puppet-agent on #{result['target']}: #{result['status']}")
diff --git a/tasks/install_shell.sh b/tasks/install_shell.sh
index b750be5f..4a41fc41 100644
--- a/tasks/install_shell.sh
+++ b/tasks/install_shell.sh
@@ -117,7 +117,7 @@ if [ -n "$PT_yum_source" ]; then
   yum_source=$PT_yum_source
 else
   if [ "$nightly" = true ]; then
-    yum_source='https://artifactory.delivery.puppetlabs.net:443/artifactory/internal_nightly__local/yum'
+    yum_source='http://nightlies.puppet.com/yum'
   else
     yum_source='http://yum.puppet.com'
   fi
@@ -137,7 +137,7 @@ if [ -n "$PT_mac_source" ]; then
   mac_source=$PT_mac_source
 else
   if [ "$nightly" = true ]; then
-    mac_source='https://artifactory.delivery.puppetlabs.net:443/artifactory/internal_nightly__local/downloads'
+    mac_source='http://nightlies.puppet.com/downloads'
   else
     mac_source='http://downloads.puppet.com'
   fi