diff --git a/project/cookiecutter.json b/project/cookiecutter.json
index aa44530..126c435 100644
--- a/project/cookiecutter.json
+++ b/project/cookiecutter.json
@@ -10,14 +10,7 @@
   "volto_version": "{{ 'Yes' | latest_volto }}",
   "python_package_name": "{{ cookiecutter.project_slug|replace(' ', '')|replace('-', '.') }}",
   "frontend_addon_name": "volto-{{ cookiecutter.python_package_name|replace('_', '-')|replace('.', '-') }}",
-  "language_code": [
-    "en",
-    "de",
-    "es",
-    "pt-br",
-    "nl",
-    "fi"
-  ],
+  "language_code": ["en", "de", "es", "pt-br", "nl", "fi"],
   "github_organization": "collective",
   "container_registry": [
     "github",
@@ -60,7 +53,7 @@
   "__gha_version_docker_qemu": "v3",
   "__gha_version_docker_buildx": "v3",
   "__gha_version_docker_login": "v3",
-  "__gha_version_docker_build_push": "v4",
+  "__gha_version_docker_build_push": "v5",
   "__devops_host": "{{ cookiecutter.hostname | extract_host }}",
   "__devops_compose_name": "{{ cookiecutter.project_slug | replace('.','-') | replace('_','-') }}",
   "__devops_stack_name": "{{ cookiecutter.hostname | replace('.','-') | replace('_','-') }}",
diff --git a/project/{{ cookiecutter.__folder_name }}/Makefile b/project/{{ cookiecutter.__folder_name }}/Makefile
index 1e0bae6..425b1de 100644
--- a/project/{{ cookiecutter.__folder_name }}/Makefile	
+++ b/project/{{ cookiecutter.__folder_name }}/Makefile	
@@ -26,8 +26,6 @@ GREEN=`tput setaf 2`
 RESET=`tput sgr0`
 YELLOW=`tput setaf 3`
 
-VOLTO_VERSION=$(VOLTO_VERSION) PLONE_VERSION=$(PLONE_VERSION)
-
 .PHONY: all
 all: install
 
diff --git a/sub/project_settings/{{ cookiecutter.__folder_name }}/backend/Dockerfile b/sub/project_settings/{{ cookiecutter.__folder_name }}/backend/Dockerfile
index 6d88ea5..19e753f 100644
--- a/sub/project_settings/{{ cookiecutter.__folder_name }}/backend/Dockerfile	
+++ b/sub/project_settings/{{ cookiecutter.__folder_name }}/backend/Dockerfile	
@@ -16,6 +16,8 @@ RUN <<EOT
     mv src/requirements-docker.txt src/requirements.txt
     sed -i 's/-e .\[test\]/./g' src/mx.ini
     cd /app/src
+    # remove potentially existing virtualenv from local build
+    rm -rf .venv
     ../bin/mxdev -c mx.ini
     ../bin/uv pip install -r requirements-mxdev.txt
     ../bin/python /compile_mo.py
diff --git a/sub/project_settings/{{ cookiecutter.__folder_name }}/backend/Dockerfile.acceptance b/sub/project_settings/{{ cookiecutter.__folder_name }}/backend/Dockerfile.acceptance
index b174da4..0dbd904 100644
--- a/sub/project_settings/{{ cookiecutter.__folder_name }}/backend/Dockerfile.acceptance	
+++ b/sub/project_settings/{{ cookiecutter.__folder_name }}/backend/Dockerfile.acceptance	
@@ -16,6 +16,8 @@ RUN <<EOT
     mv src/requirements-docker.txt src/requirements.txt
     sed -i 's/-e .\[test\]/./g' src/mx.ini
     cd /app/src
+    # remove potentially existing virtualenv from local build
+    rm -rf .venv
     ../bin/mxdev -c mx.ini
     ../bin/uv pip install -r requirements-mxdev.txt
     ../bin/python /compile_mo.py
diff --git a/sub/project_settings/{{ cookiecutter.__folder_name }}/backend/Makefile b/sub/project_settings/{{ cookiecutter.__folder_name }}/backend/Makefile
index ab7b0de..1fa19f8 100644
--- a/sub/project_settings/{{ cookiecutter.__folder_name }}/backend/Makefile	
+++ b/sub/project_settings/{{ cookiecutter.__folder_name }}/backend/Makefile	
@@ -124,7 +124,11 @@ test: $(BIN_FOLDER)/tox ## run tests
 test-coverage: $(BIN_FOLDER)/tox ## run tests with coverage
 	$(BIN_FOLDER)/tox -e coverage
 
-# Build Docker image
+# Build Docker images
 .PHONY: build-image
 build-image:  ## Build Docker Images
 	@DOCKER_BUILDKIT=1 docker build . -t $(IMAGE_NAME_PREFIX)-backend:$(IMAGE_TAG) -f Dockerfile --build-arg PLONE_VERSION=$(PLONE_VERSION)
+
+.PHONY: acceptance-image-build
+acceptance-image-build:  ## Build Docker Images
+	@DOCKER_BUILDKIT=1 docker build . -t $(IMAGE_NAME_PREFIX)-backend-acceptance:$(IMAGE_TAG) -f Dockerfile.acceptance --build-arg PLONE_VERSION=$(PLONE_VERSION)