diff --git a/app/tasks/maintenance/t20250304_backfill_traitement_revision_id_task.rb b/app/tasks/maintenance/t20250304_backfill_traitement_revision_id_task.rb
new file mode 100644
index 00000000000..de1ee2c0b8d
--- /dev/null
+++ b/app/tasks/maintenance/t20250304_backfill_traitement_revision_id_task.rb
@@ -0,0 +1,32 @@
+# frozen_string_literal: true
+
+module Maintenance
+  class T20250304BackfillTraitementRevisionIdTask < MaintenanceTasks::Task
+    # Documentation: cette tâche assigne la revision_id qui manque aux traitements des vieux dossiers
+
+    include RunnableOnDeployConcern
+    include StatementsHelpersConcern
+
+    # Uncomment only if this task MUST run imperatively on its first deployment.
+    # If possible, leave commented for manual execution later.
+    # run_on_first_deploy
+
+    def collection
+      Traitement.joins(dossier: :procedure)
+        .where(state: Dossier.states.fetch(:en_construction), revision_id: nil)
+        .where('traitements.processed_at = dossiers.depose_at')
+        .order(:id)
+    end
+
+    def process(traitement)
+      revisions = traitement.dossier
+        .procedure
+        .revisions
+        .where.not(published_at: nil)
+        .reorder(:published_at)
+
+      revision = revisions.where(published_at: ..traitement.processed_at).last
+      traitement.update!(revision:) if revision.present?
+    end
+  end
+end
diff --git a/spec/tasks/maintenance/t20250304_backfill_traitement_revision_id_task_spec.rb b/spec/tasks/maintenance/t20250304_backfill_traitement_revision_id_task_spec.rb
new file mode 100644
index 00000000000..0b2331c28ff
--- /dev/null
+++ b/spec/tasks/maintenance/t20250304_backfill_traitement_revision_id_task_spec.rb
@@ -0,0 +1,47 @@
+# frozen_string_literal: true
+
+require "rails_helper"
+
+module Maintenance
+  RSpec.describe T20250304BackfillTraitementRevisionIdTask do
+    let(:dossiers) { create_list(:dossier, 2, :en_construction) }
+    let(:dossier) { dossiers.first }
+    let(:traitement) { dossier.traitements.first }
+    let(:last_revision) { dossier.procedure.revisions.first }
+    let(:previous_revision) { dossier.procedure.revisions.second }
+
+    before do
+      traitement.update(revision_id: nil)
+    end
+
+    describe "#process" do
+      subject(:process) { described_class.process(traitement) }
+
+      context "when dossier depose on last revision" do
+        before do
+          last_revision.update(published_at: traitement.processed_at - 1.minute)
+          previous_revision.update(published_at: traitement.processed_at - 2.minutes)
+        end
+
+        it { expect { process }.to change { traitement.reload.revision }.from(nil).to(last_revision) }
+      end
+
+      context "when dossier depose on previous revision" do
+        before do
+          last_revision.update(published_at: traitement.processed_at + 1.minute)
+          previous_revision.update(published_at: traitement.processed_at - 1.minute)
+        end
+
+        it { expect { process }.to change { traitement.reload.revision }.from(nil).to(previous_revision) }
+      end
+    end
+
+    describe "#collection" do
+      subject(:collection) { described_class.collection }
+
+      it "returns the correct collection" do
+        expect(collection.size).to eq(1)
+      end
+    end
+  end
+end