diff --git a/lib/tasks/deployment/20230721142825_purge_motivation_dossiers_not_termine.rake b/lib/tasks/deployment/20230721142825_purge_motivation_dossiers_not_termine.rake
new file mode 100644
index 000000000..0e8e29c61
--- /dev/null
+++ b/lib/tasks/deployment/20230721142825_purge_motivation_dossiers_not_termine.rake
@@ -0,0 +1,21 @@
+namespace :after_party do
+  desc 'Deployment task: purge_motivation_dossiers_not_termine'
+  task purge_motivation_dossiers_not_termine: :environment do
+    puts "Running deploy task 'purge_motivation_dossiers_not_termine'"
+
+    dossier_with_justificatif_motivation_ids = ActiveStorage::Attachment.where(name: 'justificatif_motivation').pluck(:record_id).uniq
+    dossiers = Dossier.where(id: dossier_with_justificatif_motivation_ids).state_not_termine
+    progress = ProgressReport.new(dossiers.count)
+
+    dossiers.find_each do |dossier|
+      dossier.justificatif_motivation.purge_later
+      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