diff --git a/app/services/procedure_archive_service.rb b/app/services/procedure_archive_service.rb
index 3fd4c7211..a0fc992b0 100644
--- a/app/services/procedure_archive_service.rb
+++ b/app/services/procedure_archive_service.rb
@@ -16,14 +16,6 @@ class ProcedureArchiveService
   end
 
   def collect_files_archive(archive, instructeur)
-    if Flipper.enabled?(:zip_using_binary, @procedure)
-      new_collect_files_archive(archive, instructeur)
-    else
-      old_collect_files_archive(archive, instructeur)
-    end
-  end
-
-  def new_collect_files_archive(archive, instructeur)
     dossiers = Dossier.visible_by_administration
       .where(groupe_instructeur: archive.groupe_instructeurs)
 
@@ -42,47 +34,6 @@ class ProcedureArchiveService
     InstructeurMailer.send_archive(instructeur, @procedure, archive).deliver_later
   end
 
-  def old_collect_files_archive(archive, instructeur)
-    dossiers = Dossier.visible_by_administration
-      .where(groupe_instructeur: archive.groupe_instructeurs)
-
-    dossiers = if archive.time_span_type == 'everything'
-      dossiers.state_termine
-    else
-      dossiers.processed_in_month(archive.month)
-    end
-
-    files = create_list_of_attachments(dossiers)
-
-    tmp_file = Tempfile.new(['tc', '.zip'])
-
-    Zip::OutputStream.open(tmp_file) do |zipfile|
-      bug_reports = ''
-      files.each do |attachment, pj_filename|
-        zipfile.put_next_entry("#{zip_root_folder}/#{pj_filename}")
-        begin
-          zipfile.puts(attachment.download)
-        rescue
-          bug_reports += "Impossible de récupérer le fichier #{pj_filename}\n"
-        end
-      end
-      if !bug_reports.empty?
-        zipfile.put_next_entry("#{zip_root_folder}/LISEZMOI.txt")
-        zipfile.puts(bug_reports)
-      end
-    end
-
-    archive.file.attach(
-      io: File.open(tmp_file),
-      filename: archive.filename(@procedure),
-      # we don't want to run virus scanner on this file
-      metadata: { virus_scan_result: ActiveStorage::VirusScanner::SAFE }
-    )
-    tmp_file.delete
-    archive.make_available!
-    InstructeurMailer.send_archive(instructeur, @procedure, archive).deliver_later
-  end
-
   def self.procedure_files_size(procedure)
     dossiers_files_size(procedure.dossiers)
   end
diff --git a/spec/services/procedure_archive_service_spec.rb b/spec/services/procedure_archive_service_spec.rb
index 05776aee9..3a0bf698a 100644
--- a/spec/services/procedure_archive_service_spec.rb
+++ b/spec/services/procedure_archive_service_spec.rb
@@ -33,97 +33,7 @@ describe ProcedureArchiveService do
     end
   end
 
-  describe '#old_collect_files_archive' do
-    before do
-      create_dossier_for_month(year, month)
-      create_dossier_for_month(2020, month)
-    end
-
-    after { Timecop.return }
-
-    context 'for a specific month' do
-      let(:archive) { create(:archive, time_span_type: 'monthly', status: 'pending', month: date_month, groupe_instructeurs: groupe_instructeurs) }
-      let(:year) { 2021 }
-      let(:mailer) { double('mailer', deliver_later: true) }
-
-      it 'collect files' do
-        expect(InstructeurMailer).to receive(:send_archive).and_return(mailer)
-
-        service.collect_files_archive(archive, instructeur)
-
-        archive.file.open do |f|
-          files = ZipTricks::FileReader.read_zip_structure(io: f)
-          expect(files.size).to be 2
-          expect(files.first.filename).to include("export")
-          expect(files.last.filename).to include("attestation")
-        end
-        expect(archive.file.attached?).to be_truthy
-      end
-
-      context 'with a missing file' do
-        let(:pj) do
-          PiecesJustificativesService::FakeAttachment.new(
-            file: StringIO.new('coucou'),
-            filename: "export-dossier.pdf",
-            name: 'pdf_export_for_instructeur',
-            id: 1,
-            created_at: Time.zone.now
-          )
-        end
-
-        let(:bad_pj) do
-          PiecesJustificativesService::FakeAttachment.new(
-            file: nil,
-            filename: "cni.png",
-            name: 'cni.png',
-            id: 2,
-            created_at: Time.zone.now
-          )
-        end
-
-        let(:documents) { [pj, bad_pj] }
-        before do
-          allow(PiecesJustificativesService).to receive(:liste_documents).and_return(documents)
-        end
-
-        it 'collect files without raising exception' do
-          expect { service.collect_files_archive(archive, instructeur) }.not_to raise_exception
-        end
-
-        it 'add bug report to archive' do
-          service.collect_files_archive(archive, instructeur)
-
-          archive.file.open do |f|
-            files = ZipTricks::FileReader.read_zip_structure(io: f)
-            expect(files.size).to be 4
-            expect(files.last.filename).to eq("procedure-#{procedure.id}/LISEZMOI.txt")
-            expect(extract(f, files.last)).to match(/Impossible de .*cni.*png/)
-          end
-        end
-      end
-    end
-
-    context 'for all months' do
-      let(:archive) { create(:archive, time_span_type: 'everything', status: 'pending', groupe_instructeurs: groupe_instructeurs) }
-      let(:mailer) { double('mailer', deliver_later: true) }
-
-      it 'collect files' do
-        expect(InstructeurMailer).to receive(:send_archive).and_return(mailer)
-
-        service.collect_files_archive(archive, instructeur)
-
-        archive = Archive.last
-        archive.file.open do |f|
-          files = ZipTricks::FileReader.read_zip_structure(io: f)
-          expect(files.size).to be 4
-        end
-        expect(archive.file.attached?).to be_truthy
-      end
-    end
-  end
-
-  describe '#new_collect_files_archive' do
-    before { Flipper.enable_actor(:zip_using_binary, procedure) }
+  describe '#collect_files_archive' do
     let!(:dossier) { create_dossier_for_month(year, month) }
     let!(:dossier_2020) { create_dossier_for_month(2020, month) }