diff --git a/puppet/kandra/files/hooks/post-deploy.d/restart_mirror_to_czo.hook b/puppet/kandra/files/hooks/post-deploy.d/restart_mirror_to_czo.hook
new file mode 100644
index 0000000000..e77825e1bf
--- /dev/null
+++ b/puppet/kandra/files/hooks/post-deploy.d/restart_mirror_to_czo.hook
@@ -0,0 +1,9 @@
+#!/usr/bin/env bash
+
+set -e
+set -u
+
+# This script uses `uv run`, and thus uses the production venv.  This
+# means that we need to make sure that we restart into the new venv,
+# so we don't start to error when the old venv gets garbage collected.
+supervisorctl restart mirror_to_czo:*
diff --git a/puppet/kandra/files/mirror_to_czo b/puppet/kandra/files/mirror_to_czo
index 8705daadee..ac6db5bf41 100755
--- a/puppet/kandra/files/mirror_to_czo
+++ b/puppet/kandra/files/mirror_to_czo
@@ -6,6 +6,8 @@ import time
 from contextlib import suppress
 from typing import Any
 
+# This import (and its dependencies) come from the production venv,
+# because we use `uv run` to execute this script.
 import zulip
 
 config_file = configparser.RawConfigParser()
diff --git a/puppet/kandra/manifests/mirror_to_czo.pp b/puppet/kandra/manifests/mirror_to_czo.pp
index d0af207e3c..94d7076a2e 100644
--- a/puppet/kandra/manifests/mirror_to_czo.pp
+++ b/puppet/kandra/manifests/mirror_to_czo.pp
@@ -1,4 +1,5 @@
 class kandra::mirror_to_czo {
+  include zulip::hooks::base
   include zulip::supervisor
 
   # We embed the hash of the contents into the name of the process, so
@@ -28,4 +29,6 @@ class kandra::mirror_to_czo {
     content => template('kandra/supervisor/conf.d/mirror_to_czo.conf.template.erb'),
     notify  => Service[supervisor],
   }
+
+  kandra::hooks::file { 'post-deploy.d/restart_mirror_to_czo.hook': }
 }