diff --git a/app/controllers/api/experience_cs_project_migrations_controller.rb b/app/controllers/api/experience_cs_project_migrations_controller.rb
index 67f8aba92..4a6feeedc 100644
--- a/app/controllers/api/experience_cs_project_migrations_controller.rb
+++ b/app/controllers/api/experience_cs_project_migrations_controller.rb
@@ -29,7 +29,8 @@ def migrate_project!
         authorize! :migrate_from_experience_cs, @project
         @project.update!(
           attributes.slice(:name, :instructions).merge(
-            project_type: Project::Types::CODE_EDITOR_SCRATCH
+            project_type: Project::Types::CODE_EDITOR_SCRATCH,
+            origin: Project::Origins::EXPERIENCE_CS
           )
         )
         scratch_component = @project.scratch_component || @project.build_scratch_component
diff --git a/app/controllers/api/projects_controller.rb b/app/controllers/api/projects_controller.rb
index 9da91fdd9..76cd82a67 100644
--- a/app/controllers/api/projects_controller.rb
+++ b/app/controllers/api/projects_controller.rb
@@ -43,7 +43,7 @@ def create
     end
 
     def update
-      result = Project::Update.call(project: @project, update_hash: project_params)
+      result = Project::Update.call(project: @project, update_hash: project_params, current_user:)
 
       if result.success?
         track_project_event('Project - Saved', @project)
diff --git a/lib/concepts/project/operations/update.rb b/lib/concepts/project/operations/update.rb
index 9f30cd330..90caf65a4 100644
--- a/lib/concepts/project/operations/update.rb
+++ b/lib/concepts/project/operations/update.rb
@@ -3,11 +3,11 @@
 class Project
   class Update
     class << self
-      def call(project:, update_hash:)
+      def call(project:, update_hash:, current_user: nil)
         response = setup_response(project)
 
         setup_deletions(response, update_hash)
-        update_project_attributes(response, update_hash)
+        update_project_attributes(response, update_hash, current_user)
         update_component_attributes(response, update_hash)
         update_scratch_component_attributes(response, update_hash)
         persist_changes(response)
@@ -43,10 +43,12 @@ def validate_deletions(response)
         response[:error] = I18n.t 'errors.project.editing.delete_default_component'
       end
 
-      def update_project_attributes(response, update_hash)
+      def update_project_attributes(response, update_hash, current_user)
         return if response.failure?
 
-        response[:project].assign_attributes(update_hash.slice(:name, :instructions, :project_type))
+        attributes = update_hash.slice(:name, :instructions, :project_type)
+        attributes[:origin] = Project::Origins::EXPERIENCE_CS if current_user&.experience_cs_admin?
+        response[:project].assign_attributes(attributes)
       end
 
       def update_component_attributes(response, update_hash)
diff --git a/spec/concepts/project/update_spec.rb b/spec/concepts/project/update_spec.rb
index 193ee150c..178455443 100644
--- a/spec/concepts/project/update_spec.rb
+++ b/spec/concepts/project/update_spec.rb
@@ -132,6 +132,32 @@
         expect { update }.to change { project.reload.instructions }.to('new instructions')
       end
     end
+
+    context 'when the current user is an Experience CS admin' do
+      subject(:update_as_admin) { described_class.call(project:, update_hash:, current_user:) }
+
+      let(:current_user) { create(:experience_cs_admin_user) }
+      let(:update_hash) do
+        {
+          name: 'updated project name',
+          components: component_hash,
+          instructions:
+        }
+      end
+
+      it 'returns success? true' do
+        expect(update_as_admin.success?).to be(true)
+      end
+
+      it 'sets the project origin to experience_cs' do
+        expect(update_as_admin[:project].origin).to eq(Project::Origins::EXPERIENCE_CS)
+      end
+
+      it 'succeeds when the origin is already experience_cs' do
+        project.update(origin: Project::Origins::EXPERIENCE_CS)
+        expect(update_as_admin.success?).to be(true)
+      end
+    end
   end
 
   def component_properties_hash(component)
diff --git a/spec/requests/experience_cs_project_migrations/update_spec.rb b/spec/requests/experience_cs_project_migrations/update_spec.rb
index d887c25ff..26dfaa03a 100644
--- a/spec/requests/experience_cs_project_migrations/update_spec.rb
+++ b/spec/requests/experience_cs_project_migrations/update_spec.rb
@@ -47,7 +47,8 @@
       school_id: school.id,
       name: 'Migrated project',
       instructions: [{ 'markdown_content' => 'Make the sprite move.' }],
-      project_type: Project::Types::CODE_EDITOR_SCRATCH
+      project_type: Project::Types::CODE_EDITOR_SCRATCH,
+      origin: Project::Origins::EXPERIENCE_CS
     )
     expect(project.scratch_component.content.to_h).to eq(scratch_data.deep_stringify_keys)
   end
diff --git a/spec/requests/projects/update_spec.rb b/spec/requests/projects/update_spec.rb
index 876983cee..249891a28 100644
--- a/spec/requests/projects/update_spec.rb
+++ b/spec/requests/projects/update_spec.rb
@@ -43,12 +43,19 @@
       expect(response.body).to include('updated component content')
     end
 
-    it 'calls update operation' do
+    it 'calls update operation with the current user' do
       mock_response = instance_double(OperationResponse)
       allow(mock_response).to receive(:success?).and_return(true)
       allow(Project::Update).to receive(:call).and_return(mock_response)
       put("/api/projects/#{project.identifier}", params:, headers:)
-      expect(Project::Update).to have_received(:call)
+      expect(Project::Update).to have_received(:call).with(
+        a_hash_including(project:, current_user: owner)
+      )
+    end
+
+    it 'does not set the project origin' do
+      put("/api/projects/#{project.identifier}", params:, headers:)
+      expect(project.reload.origin).to be_nil
     end
 
     context 'when no components specified' do
@@ -181,6 +188,28 @@
       expect(project.scratch_component.reload.content.to_h).to eq(scratch_data.deep_stringify_keys)
     end
 
+    it 'sets the project origin to experience_cs' do
+      put('/api/projects/experience-cs-project?locale=fr', params:, headers:, as: :json)
+
+      expect(project.reload.origin).to eq(Project::Origins::EXPERIENCE_CS)
+    end
+
+    it 'sets the origin when overwriting an existing template project in the en locale' do
+      project.update!(locale: 'en', origin: nil)
+
+      put('/api/projects/experience-cs-project?locale=en', params:, headers:, as: :json)
+
+      expect(project.reload.origin).to eq(Project::Origins::EXPERIENCE_CS)
+    end
+
+    it 'leaves the origin as experience_cs when re-syncing a project' do
+      project.update!(origin: Project::Origins::EXPERIENCE_CS)
+
+      put('/api/projects/experience-cs-project?locale=fr', params:, headers:, as: :json)
+
+      expect(project.reload.origin).to eq(Project::Origins::EXPERIENCE_CS)
+    end
+
     context 'when authenticated with the Experience CS service API key' do
       let(:headers) { { ExperienceCsServiceAuthenticator::HEADER => 'service-api-key' } }
 
@@ -242,6 +271,12 @@
 
         expect(response).to have_http_status(:forbidden)
       end
+
+      it 'sets the project origin to experience_cs' do
+        put('/api/projects/experience-cs-project?locale=fr', params:, headers:, as: :json)
+
+        expect(project.reload.origin).to eq(Project::Origins::EXPERIENCE_CS)
+      end
     end
   end