diff --git a/patchwork/management/commands/update_reviewers.py b/patchwork/management/commands/update_reviewers.py
new file mode 100644
index 00000000..0b4862e0
--- /dev/null
+++ b/patchwork/management/commands/update_reviewers.py
@@ -0,0 +1,25 @@
+# Patchwork - automated patch tracking system
+# Copyright (C) 2015 Jeremy Kerr <jk@ozlabs.org>
+#
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+from django.core.management.base import BaseCommand
+from patchwork.models import Patch
+from patchwork.api.patch import PatchReviewIntentionSerializer
+
+
+class Command(BaseCommand):
+    help = 'Updates the patch has_planned_review field'
+
+    def handle(self, *args, **kwargs):
+        for patch in Patch.objects.all():
+            has_planned_review = False
+            for (
+                patch_interest
+            ) in patch.planning_to_review.through.objects.filter(patch=patch):
+                serializer = PatchReviewIntentionSerializer(patch_interest)
+                if not serializer.data['is_stale']:
+                    has_planned_review = True
+                    break
+            patch.has_planned_review = has_planned_review
+            patch.save()
diff --git a/tools/docker/Dockerfile b/tools/docker/Dockerfile
index bdae67a2..eaadd071 100644
--- a/tools/docker/Dockerfile
+++ b/tools/docker/Dockerfile
@@ -31,6 +31,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     sqlite3 \
     tzdata \
     pkg-config \
+    cron \
     && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
 
 RUN pip install wheel tox
@@ -40,8 +41,15 @@ RUN pip install wheel tox
 COPY requirements-dev.txt requirements-test.txt /opt/
 RUN pip install -r /opt/requirements-dev.txt
 
+COPY tools/docker/crontab /etc/cron.d/patchwork-cron
+RUN crontab -u patchwork /etc/cron.d/patchwork-cron
+RUN chmod u+s /usr/sbin/cron
+RUN printenv >> /etc/environment
+
 COPY tools/docker/entrypoint.sh /usr/local/bin/entrypoint.sh
 ENTRYPOINT ["/usr/local/bin/entrypoint.sh"]
 CMD ["python3", "manage.py", "runserver", "0.0.0.0:8000"]
 USER patchwork
 WORKDIR /home/patchwork/patchwork
+
+COPY --chown=patchwork:patchwork . .
diff --git a/tools/docker/crontab b/tools/docker/crontab
new file mode 100644
index 00000000..f21f80a1
--- /dev/null
+++ b/tools/docker/crontab
@@ -0,0 +1 @@
+* * * * * /opt/pyenv/shims/python patchwork/manage.py update_reviewers > /proc/1/fd/1 2>&1
diff --git a/tools/docker/entrypoint.sh b/tools/docker/entrypoint.sh
index c78c0581..fb5147c4 100755
--- a/tools/docker/entrypoint.sh
+++ b/tools/docker/entrypoint.sh
@@ -102,4 +102,5 @@ if ! python manage.py migrate sessions --check -v0; then
     python manage.py loaddata default_projects #> /dev/null
 fi
 
+cron
 exec "$@"