diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9bcc580..41a485e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -26,7 +26,8 @@ jobs:
         run: |
           python3 -m pip install --upgrade pip
           pip3 install --upgrade coveralls
-          pip3 install -e .[dev]
+          pip3 install -e .
+          pip3 install -r requirements-dev.txt
 
       - name: Run precommit
         run: |
diff --git a/.github/workflows/publish-to-pypi.yml b/.github/workflows/publish-to-pypi.yml
index da24d13..38f5d1f 100644
--- a/.github/workflows/publish-to-pypi.yml
+++ b/.github/workflows/publish-to-pypi.yml
@@ -25,12 +25,12 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install setuptools wheel twine
+        pip install build setuptools wheel twine
 
     - name: Build and publish
       env:
         TWINE_USERNAME: "__token__"
         TWINE_PASSWORD: ${{ secrets.PYPI_TOKEN }}
       run: |
-        python setup.py sdist bdist_wheel
+        python -m build --sdist --wheel
         twine upload dist/*
diff --git a/docs/source/contributing.rst b/docs/source/contributing.rst
index aae5b12..cb7483f 100644
--- a/docs/source/contributing.rst
+++ b/docs/source/contributing.rst
@@ -19,15 +19,32 @@ It can well be that we already started working on the feature, or that there are
 
 .. _create a new issue: https://github.com/aas-core-works/aas-core3.0-python-protobuf/issues
 
-SDK Code Generation
-===================
+Code Generation
+===============
 
-The biggest part of the code has been automatically generated by `aas-core-codegen`_.
+The code for the conversion model instance ⟷ Protocol Buffer has been automatically generated by `aas-core-codegen`_.
 It probably makes most sense to change the generator rather than add new functionality.
 However, this needs to be decided on a case-by-case basis.
 
 .. _aas-core-codegen: https://github.com/aas-core-works/aas-core-codegen
 
+To re-generate the conversion code, run ``dev_scripts/generate_pbization.py``:
+
+.. code-block::
+
+	python dev_scripts/generate_pbization.py
+
+The code for managing Protocol Buffers has been generated using `protoc`_.
+You have to have `protoc`_ installed.
+
+.. _protoc: https://grpc.io/docs/protoc-installation/
+
+To re-generate the code for Protocol Buffer management, run:
+
+.. code-block::
+
+	python dev_scripts/run_protoc.py
+
 Test Data
 =========
 
@@ -35,15 +52,25 @@ The test data is automatically generated by `aas-core3.0-testgen`_, and copied t
 
 .. _aas-core3.0-testgen: https://github.com/aas-core-works/aas-core3.0-testgen
 
+New Versions of the Meta-model
+==============================
+If there is a new patch version of the meta-model, you have to:
+
+* Update the Protocol Buffer definitions in ``dev_scripts/proto`` (see also ``dev_scripts/update_proto_definition.py``),
+* Re-generate the code for the management of Protocol Buffers (see above), and
+* Update the ``aas-core-meta`` commit hash in ``requirements-dev.txt`` and install the newest version, and
+* Re-generate the conversion code (see above).
+
 Pre-commit Checks
 =================
 
-Before you can run pre-commit checks, you need to all the development dependencies.
+Before you can run pre-commit checks, you need to all the dependencies as well as the development dependencies.
 Run in your virtual environment:
 
 .. code-block::
 
-    pip3 install --editable .[dev]
+    pip3 install --editable .
+    pip3 install -r requirements-dev.txt
 
 Now you can execute the checks (from the repository root):
 
diff --git a/pyproject.toml b/pyproject.toml
index 3a5729d..986b977 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -35,8 +35,6 @@ dependencies = [
 [project.urls]
 repository = "https://github.com/aas-core-works/aas-core3.0-python-protobuf"
 
-license = "MIT"
-
 [tool.setuptools.packages.find]
 include = ["aas_core3_protobuf"]
 exclude = ["precommit.py"]
@@ -71,18 +69,3 @@ strict = true
 [[tool.mypy.overrides]]
 module = "aas_core3_protobuf.types_pb2"
 ignore_errors = true
-
-[project.optional-dependencies]
-dev = [
-    "black==24.8.0",
-    "pylint==3.2.7",
-    "mypy==1.5.1",
-    "coverage>=7,<8",
-    "aas-core-meta@git+https://github.com/aas-core-works/aas-core-meta@f9cbdb3#egg=aas-core-meta",
-    "aas-core-codegen@git+https://github.com/aas-core-works/aas-core-codegen@f0f0925c#egg=aas-core-codegen",
-    # NOTE (mristin):
-    # We need at least aas-core3.0 1.1.0 for the general XML de-serialization in
-    # the test code.
-    "aas-core3.0>=1.1.0,<2",
-    "types-protobuf==5.28.3.20241030"
-]
diff --git a/requirements-dev.txt b/requirements-dev.txt
new file mode 100644
index 0000000..43d4864
--- /dev/null
+++ b/requirements-dev.txt
@@ -0,0 +1,14 @@
+black==24.8.0
+pylint==3.2.7
+mypy==1.5.1
+coverage>=7,<8
+
+aas-core-meta@git+https://github.com/aas-core-works/aas-core-meta@f9cbdb3#egg=aas-core-meta
+aas-core-codegen@git+https://github.com/aas-core-works/aas-core-codegen@f0f0925c#egg=aas-core-codegen
+
+# NOTE (mristin):
+# We need at least aas-core3.0 1.1.0 for the general XML de-serialization in
+# the test code.
+aas-core3.0>=1.1.0,<2
+
+types-protobuf==5.28.3.20241030"
\ No newline at end of file