diff --git a/lib/tasks/deployment/20220513135112_fix_depose_at_nil_on_dossier_state_not_brouillon.rake b/lib/tasks/deployment/20220513135112_fix_depose_at_nil_on_dossier_state_not_brouillon.rake
new file mode 100644
index 000000000..d41e6d2fc
--- /dev/null
+++ b/lib/tasks/deployment/20220513135112_fix_depose_at_nil_on_dossier_state_not_brouillon.rake
@@ -0,0 +1,17 @@
+namespace :after_party do
+  desc 'Deployment task: fix_depose_at_nil_on_dossier_state_not_brouillon'
+  task fix_depose_at_nil_on_dossier_state_not_brouillon: :environment do
+    puts "Running deploy task 'fix_depose_at_nil_on_dossier_state_not_brouillon'"
+
+    # Put your task implementation HERE.
+    dossiers_with_depose_at_nil = Dossier.state_not_brouillon.where(depose_at: nil)
+
+    rake_puts "Number of dossiers not in brouillon without depose_at : #{dossiers_with_depose_at_nil.count}"
+
+    dossiers_with_depose_at_nil.update_all("depose_at = en_construction_at")
+    # 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