diff --git a/config/initializers/new_framework_defaults_6_0.rb b/config/initializers/new_framework_defaults_6_0.rb
index d5667abbf..38c836561 100644
--- a/config/initializers/new_framework_defaults_6_0.rb
+++ b/config/initializers/new_framework_defaults_6_0.rb
@@ -17,7 +17,7 @@ Rails.application.config.action_view.default_enforce_utf8 = false
 Rails.application.config.action_dispatch.use_cookies_with_metadata = true
 
 # Change the return value of `ActionDispatch::Response#content_type` to Content-Type header without modification.
-# Rails.application.config.action_dispatch.return_only_media_type_on_content_type = false
+Rails.application.config.action_dispatch.return_only_media_type_on_content_type = false
 
 # Return false instead of self when enqueuing is aborted from a callback.
 # Rails.application.config.active_job.return_false_on_aborted_enqueue = true
diff --git a/spec/controllers/instructeurs/procedures_controller_spec.rb b/spec/controllers/instructeurs/procedures_controller_spec.rb
index d32d7dffa..7e5f2e561 100644
--- a/spec/controllers/instructeurs/procedures_controller_spec.rb
+++ b/spec/controllers/instructeurs/procedures_controller_spec.rb
@@ -540,8 +540,8 @@ describe Instructeurs::ProceduresController, type: :controller do
           format: :js
       end
 
-      it "responses in the correct format" do
-        expect(response.content_type).to eq "text/javascript"
+      it 'responds in the correct format' do
+        expect(response.media_type).to eq('text/javascript')
         expect(response).to have_http_status(:ok)
       end
     end
diff --git a/spec/controllers/new_administrateur/attestation_templates_controller_spec.rb b/spec/controllers/new_administrateur/attestation_templates_controller_spec.rb
index 83079adc6..4e50739e9 100644
--- a/spec/controllers/new_administrateur/attestation_templates_controller_spec.rb
+++ b/spec/controllers/new_administrateur/attestation_templates_controller_spec.rb
@@ -23,7 +23,7 @@ describe NewAdministrateur::AttestationTemplatesController, type: :controller do
     render_views
     it 'renders a PDF' do
       expect(subject.status).to eq(200)
-      expect(subject.content_type).to eq('application/pdf')
+      expect(subject.media_type).to eq('application/pdf')
     end
   end