diff --git a/site-modules/profile/manifests/netbox.pp b/site-modules/profile/manifests/netbox.pp
--- a/site-modules/profile/manifests/netbox.pp
+++ b/site-modules/profile/manifests/netbox.pp
@@ -29,6 +29,14 @@
 
   ensure_packages ('python3-venv')
 
+  ::apt::pin {'python3':
+    explanation => 'Pin python3.7 version so venv still works after bullseye upgrade',
+    packages    => ['python3'],
+    version     => '3.7.3-1',
+    priority    => 1001,
+    notify      => Package['python3-venv'],
+  }
+
   include ::postgresql::server
 
   ::postgresql::server::db {$db_database: