diff --git a/puppet/zulip/manifests/apache_sso.pp b/puppet/zulip/manifests/apache_sso.pp
index ab32067581..dbdeab7312 100644
--- a/puppet/zulip/manifests/apache_sso.pp
+++ b/puppet/zulip/manifests/apache_sso.pp
@@ -1,9 +1,12 @@
 class zulip::apache_sso {
   include zulip::localhost_sso
 
-  $apache_packages = [ "apache2", "libapache2-mod-wsgi", ]
+  $apache_packages = [ "apache2", "libapache2-mod-wsgi-py3", ]
   package { $apache_packages: ensure => "installed" }
 
+  $apache_former_packages = [ "apache2", "libapache2-mod-wsgi", ]
+  package { $apache_legacy_packages: ensure => "absent" }
+
   apache2mod { [ "headers", "proxy", "proxy_http", "rewrite", "ssl", ]:
     ensure  => present,
     require => Package['apache2'],