diff --git a/app/controllers/instructeurs/dossiers_controller.rb b/app/controllers/instructeurs/dossiers_controller.rb
index 05b13ee05..f013c537a 100644
--- a/app/controllers/instructeurs/dossiers_controller.rb
+++ b/app/controllers/instructeurs/dossiers_controller.rb
@@ -134,7 +134,15 @@ module Instructeurs
       end
 
       @dossier = dossier
-      redirect_back(fallback_location: instructeur_procedure_path(procedure))
+      respond_to do |format|
+        format.turbo_stream do
+          render :change_state
+        end
+
+        format.html do
+          redirect_back(fallback_location: instructeur_procedure_path(procedure))
+        end
+      end
     end
 
     def repasser_en_construction
@@ -146,7 +154,15 @@ module Instructeurs
       end
 
       @dossier = dossier
-      redirect_back(fallback_location: instructeur_procedure_path(procedure))
+      respond_to do |format|
+        format.turbo_stream do
+          render :change_state
+        end
+
+        format.html do
+          redirect_back(fallback_location: instructeur_procedure_path(procedure))
+        end
+      end
     end
 
     def repasser_en_instruction
@@ -158,7 +174,15 @@ module Instructeurs
       end
 
       @dossier = dossier
-      redirect_back(fallback_location: instructeur_procedure_path(procedure))
+      respond_to do |format|
+        format.turbo_stream do
+          render :change_state
+        end
+
+        format.html do
+          redirect_back(fallback_location: instructeur_procedure_path(procedure))
+        end
+      end
     end
 
     def terminer
diff --git a/app/views/instructeurs/dossiers/_header_actions.html.haml b/app/views/instructeurs/dossiers/_header_actions.html.haml
index 0bbaec513..8ee89c31e 100644
--- a/app/views/instructeurs/dossiers/_header_actions.html.haml
+++ b/app/views/instructeurs/dossiers/_header_actions.html.haml
@@ -6,7 +6,8 @@
               archived: dossier.archived,
               dossier_is_followed: current_instructeur&.follow?(dossier),
               close_to_expiration: dossier.close_to_expiration?,
-              hidden_by_administration: dossier.hidden_by_administration? }
+              hidden_by_administration: dossier.hidden_by_administration?,
+              post_method: {data: { turbo_method: :post }}}
 
   %li.instruction-button
     = render partial: "instruction_button", locals: { dossier: dossier }
diff --git a/app/views/instructeurs/dossiers/change_state.turbo_stream.haml b/app/views/instructeurs/dossiers/change_state.turbo_stream.haml
index 94ce488db..4f0f74067 100644
--- a/app/views/instructeurs/dossiers/change_state.turbo_stream.haml
+++ b/app/views/instructeurs/dossiers/change_state.turbo_stream.haml
@@ -1 +1 @@
-= turbo_stream.update_all '.header-actions', partial: 'header_actions', locals: { dossier: @dossier }
+= turbo_stream.update_all '.sub-header', partial: 'header', locals: { dossier: @dossier }
diff --git a/app/views/instructeurs/procedures/_dossier_actions.html.haml b/app/views/instructeurs/procedures/_dossier_actions.html.haml
index 314da655c..b4a954d3f 100644
--- a/app/views/instructeurs/procedures/_dossier_actions.html.haml
+++ b/app/views/instructeurs/procedures/_dossier_actions.html.haml
@@ -3,7 +3,7 @@
     = link_to restore_instructeur_dossier_path(procedure_id, dossier_id), method: :patch, class: "fr-btn fr-icon-refresh-line" do
       = t('views.instructeurs.dossiers.restore')
 - elsif close_to_expiration || Dossier::TERMINE.include?(state)
-  %li
+  %li{ 'data-turbo': 'true' }
     - if close_to_expiration
       = link_to(repousser_expiration_instructeur_dossier_path(procedure_id, dossier_id), method: :post, class: "fr-btn") do
         = t('instructeurs.dossiers.header.banner.button_delay_expiration')
@@ -15,7 +15,7 @@
       = link_to('', instructeur_dossier_path(procedure_id, dossier_id), method: :delete, class: 'fr-btn fr-btn--secondary fr-icon-delete-line icon-only danger', title: t('views.instructeurs.dossiers.delete_dossier'))
 
     - else
-      = link_to(repasser_en_instruction_instructeur_dossier_path(procedure_id, dossier_id), method: :post, class: 'fr-btn fr-btn--secondary fr-icon-edit-line') do
+      = link_to repasser_en_instruction_instructeur_dossier_path(procedure_id, dossier_id), { class: 'fr-btn fr-btn--secondary fr-icon-edit-line' }.deep_merge!(post_method) do
         Repasser en instruction
 
       = link_to(  archive_instructeur_dossier_path(procedure_id, dossier_id), method: :patch, class: 'fr-btn fr-icon-folder-2-line') do
@@ -25,12 +25,12 @@
 
 - elsif Dossier::EN_CONSTRUCTION_OU_INSTRUCTION.include?(state)
   - if Dossier.states[:en_construction] == state
-    %li
-      = link_to passer_en_instruction_instructeur_dossier_path(procedure_id, dossier_id), method: :post, class: 'fr-btn fr-btn--secondary fr-icon-edit-line' do
+    %li{ 'data-turbo': 'true' }
+      = link_to passer_en_instruction_instructeur_dossier_path(procedure_id, dossier_id), { class: 'fr-btn fr-btn--secondary fr-icon-edit-line' }.deep_merge!(post_method) do
         Passer en instruction
   - elsif Dossier.states[:en_instruction] == state
-    %li
-      = link_to repasser_en_construction_instructeur_dossier_path(procedure_id, dossier_id), method: :post, class: 'fr-btn fr-btn--secondary fr-icon-draft-line' do
+    %li{ 'data-turbo': 'true' }
+      = link_to repasser_en_construction_instructeur_dossier_path(procedure_id, dossier_id), { class: 'fr-btn fr-btn--secondary fr-icon-draft-line' }.deep_merge!(post_method) do
         Repasser en construction
 
 
diff --git a/app/views/instructeurs/procedures/show.html.haml b/app/views/instructeurs/procedures/show.html.haml
index 81a748055..4bb34f922 100644
--- a/app/views/instructeurs/procedures/show.html.haml
+++ b/app/views/instructeurs/procedures/show.html.haml
@@ -180,7 +180,8 @@
                                   archived: p.archived,
                                   dossier_is_followed: @followed_dossiers_id.include?(p.dossier_id),
                                   close_to_expiration: @statut == 'expirant',
-                                  hidden_by_administration: @statut == 'supprimes_recemment' }
+                                  hidden_by_administration: @statut == 'supprimes_recemment',
+                                  post_method: { method: :post } }
             %tfoot
               %tr
                 %td.force-table-100{ colspan: @procedure_presentation.displayed_fields_for_headers.size + 2 }= paginate @filtered_sorted_paginated_ids
diff --git a/app/views/recherche/index.html.haml b/app/views/recherche/index.html.haml
index 46aa5b6ed..a5aaac223 100644
--- a/app/views/recherche/index.html.haml
+++ b/app/views/recherche/index.html.haml
@@ -97,7 +97,8 @@
                                                                       archived: p.archived,
                                                                       dossier_is_followed: @followed_dossiers_id.include?(p.dossier_id),
                                                                       close_to_expiration: nil,
-                                                                      hidden_by_administration: nil }
+                                                                      hidden_by_administration: nil,
+                                                                      post_method: { method: :post } }
 
             - else
               %td
diff --git a/spec/controllers/instructeurs/dossiers_controller_spec.rb b/spec/controllers/instructeurs/dossiers_controller_spec.rb
index 9f85aff93..f46dd041c 100644
--- a/spec/controllers/instructeurs/dossiers_controller_spec.rb
+++ b/spec/controllers/instructeurs/dossiers_controller_spec.rb
@@ -153,16 +153,16 @@ describe Instructeurs::DossiersController, type: :controller do
 
     it { expect(dossier.reload.state).to eq(Dossier.states.fetch(:en_instruction)) }
     it { expect(instructeur.follow?(dossier)).to be true }
-    it { expect(response).to redirect_to(instructeur_procedure_path(dossier.procedure)) }
-    it { expect(flash.notice).to eq("Dossier passé en instruction.") }
+    it { expect(response).to have_http_status(:ok) }
+    it { expect(response.body).to include('.sub-header') }
 
     context 'when the dossier has already been put en_instruction' do
       let(:dossier) { create(:dossier, :en_instruction, procedure: procedure) }
 
       it 'warns about the error' do
         expect(dossier.reload.state).to eq(Dossier.states.fetch(:en_instruction))
-        expect(response).to redirect_to(instructeur_procedure_path(dossier.procedure))
-        expect(flash.alert).to eq("Le dossier est déjà en instruction.")
+        expect(response).to have_http_status(:ok)
+        expect(response.body).to include('Le dossier est déjà en instruction.')
       end
     end
 
@@ -174,8 +174,8 @@ describe Instructeurs::DossiersController, type: :controller do
       end
 
       it 'warns about the error' do
-        expect(response).to redirect_to(instructeur_procedure_path(dossier.procedure))
-        expect(flash.alert).to eq("Le dossier est en ce moment accepté : il n’est pas possible de le passer en instruction.")
+        expect(response).to have_http_status(:ok)
+        expect(response.body).to include('Le dossier est en ce moment accepté : il n’est pas possible de le passer en instruction.')
       end
     end
 
@@ -199,16 +199,16 @@ describe Instructeurs::DossiersController, type: :controller do
     end
 
     it { expect(dossier.reload.state).to eq(Dossier.states.fetch(:en_construction)) }
-    it { expect(response).to redirect_to(instructeur_procedure_path(dossier.procedure)) }
-    it { expect(flash.notice).to eq("Dossier repassé en construction.") }
+    it { expect(response).to have_http_status(:ok) }
+    it { expect(response.body).to include('.sub-header') }
 
     context 'when the dossier has already been put en_construction' do
       let(:dossier) { create(:dossier, :en_construction, procedure: procedure) }
 
       it 'warns about the error' do
         expect(dossier.reload.state).to eq(Dossier.states.fetch(:en_construction))
-        expect(response).to redirect_to(instructeur_procedure_path(dossier.procedure))
-        expect(flash.alert).to eq("Le dossier est déjà en construction.")
+        expect(response).to have_http_status(:ok)
+        expect(response.body).to include('Le dossier est déjà en construction.')
       end
     end
 
@@ -235,8 +235,8 @@ describe Instructeurs::DossiersController, type: :controller do
 
     context 'when the dossier is refuse' do
       it { expect(dossier.reload.state).to eq(Dossier.states.fetch(:en_instruction)) }
-      it { expect(response).to redirect_to(instructeur_procedure_path(dossier.procedure)) }
-      it { expect(flash.notice).to eq("Le dossier #{dossier.id} a été repassé en instruction.") }
+      it { expect(response).to have_http_status(:ok) }
+      it { expect(response.body).to include('.sub-header') }
     end
 
     context 'when the dossier has already been put en_instruction' do
@@ -244,8 +244,8 @@ describe Instructeurs::DossiersController, type: :controller do
 
       it 'warns about the error' do
         expect(dossier.reload.state).to eq(Dossier.states.fetch(:en_instruction))
-        expect(response).to redirect_to(instructeur_procedure_path(dossier.procedure))
-        expect(flash.alert).to eq("Le dossier est déjà en instruction.")
+        expect(response).to have_http_status(:ok)
+        expect(response.body).to include('Le dossier est déjà en instruction.')
       end
     end
 
@@ -254,8 +254,7 @@ describe Instructeurs::DossiersController, type: :controller do
 
       it 'it is possible to go back to en_instruction as instructeur' do
         expect(dossier.reload.state).to eq(Dossier.states.fetch(:en_instruction))
-        expect(response).to redirect_to(instructeur_procedure_path(dossier.procedure))
-        expect(flash.notice).to eq("Le dossier #{dossier.id} a été repassé en instruction.")
+        expect(response).to have_http_status(:ok)
       end
     end
 
@@ -314,7 +313,7 @@ describe Instructeurs::DossiersController, type: :controller do
           expect(dossier.justificatif_motivation).to be_attached
         end
 
-        it { expect(subject.body).to include('.header-actions') }
+        it { expect(subject.body).to include('.sub-header') }
       end
 
       context 'with dossier in batch_operation' do
@@ -354,7 +353,7 @@ describe Instructeurs::DossiersController, type: :controller do
           subject
         end
 
-        it { expect(subject.body).to include('.header-actions') }
+        it { expect(subject.body).to include('.sub-header') }
       end
 
       context 'with attachment' do
@@ -368,7 +367,7 @@ describe Instructeurs::DossiersController, type: :controller do
           expect(dossier.justificatif_motivation).to be_attached
         end
 
-        it { expect(subject.body).to include('.header-actions') }
+        it { expect(subject.body).to include('.sub-header') }
       end
     end
 
@@ -410,14 +409,14 @@ describe Instructeurs::DossiersController, type: :controller do
         end
 
         it 'The instructeur is sent back to the dossier page' do
-          expect(subject.body).to include('.header-actions')
+          expect(subject.body).to include('.sub-header')
         end
 
         context 'and the dossier has already an attestation' do
           it 'should not crash' do
             dossier.attestation = Attestation.new
             dossier.save
-            expect(subject.body).to include('.header-actions')
+            expect(subject.body).to include('.sub-header')
           end
         end
       end
@@ -456,7 +455,7 @@ describe Instructeurs::DossiersController, type: :controller do
           expect(dossier.justificatif_motivation).to be_attached
         end
 
-        it { expect(subject.body).to include('.header-actions') }
+        it { expect(subject.body).to include('.sub-header') }
       end
     end
 
diff --git a/spec/system/instructeurs/instruction_spec.rb b/spec/system/instructeurs/instruction_spec.rb
index 6057189cb..43025324a 100644
--- a/spec/system/instructeurs/instruction_spec.rb
+++ b/spec/system/instructeurs/instruction_spec.rb
@@ -39,7 +39,9 @@ describe 'Instructing a dossier:', js: true do
 
     click_on 'Passer en instruction'
 
-    expect(page).to have_text('en instruction')
+    expect(page).to have_text('Dossier passé en instruction.')
+    expect(page).to have_text('Instruire le dossier')
+    expect(page).to have_selector('.label.en-instruction')
 
     dossier.reload
     expect(dossier.state).to eq(Dossier.states.fetch(:en_instruction))