diff --git a/lib/tasks/deployment/20211006154552_remove_orphaned_avis.rake b/lib/tasks/deployment/20211006154552_remove_orphaned_avis.rake
new file mode 100644
index 000000000..f782cf6b1
--- /dev/null
+++ b/lib/tasks/deployment/20211006154552_remove_orphaned_avis.rake
@@ -0,0 +1,22 @@
+namespace :after_party do
+  desc 'Deployment task: remove_orphaned_avis'
+  task remove_orphaned_avis: :environment do
+    puts "Running deploy task 'remove_orphaned_avis'"
+
+    avis = Avis.unscope(:joins)
+      .joins('LEFT JOIN dossiers ON dossiers.id = avis.dossier_id')
+      .where(dossiers: { id: nil })
+    progress = ProgressReport.new(avis.count)
+
+    avis.find_each do |avis|
+      avis.destroy
+      progress.inc
+    end
+    progress.finish
+
+    # Update task as completed.  If you remove the line below, the task will
+    # run with every deploy (or every time you call after_party:run).
+    AfterParty::TaskRecord
+      .create version: AfterParty::TaskRecorder.new(__FILE__).timestamp
+  end
+end