diff --git a/tasks/install_shell.sh b/tasks/install_shell.sh
index 2b0c31b2..b750be5f 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='http://nightlies.puppet.com/yum'
+    yum_source='https://artifactory.delivery.puppetlabs.net:443/artifactory/internal_nightly__local/yum'
   else
     yum_source='http://yum.puppet.com'
   fi