diff --git a/.github/workflows/pytest.yml b/.github/workflows/pytest.yml
index 9d640c5..8fad0f5 100644
--- a/.github/workflows/pytest.yml
+++ b/.github/workflows/pytest.yml
@@ -9,12 +9,18 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-22.04, ubuntu-20.04]
-        python-version: ['3.11', '3.10', '3.9', '3.8', '3.7', '3.6']
-        gdal-version: ['3.4'] #, '3.6']  TODO: gdal 3.6 is still unstable.
+        os: [ubuntu-22.04, ubuntu-20.04]  # no ubuntugis @ ubuntu-24.04
+        python-version: ['3.11', '3.10', '3.9', '3.8', '3.7'] # , '3.6'] <- 3.6 needs setup.cfg
+        gdal-version: ['3.4', '3.6']  # TODO: gdal 3.6 is still unstable.
         exclude:
+          - os: ubuntu-24.04
+            python-version: '3.8'
+          - os: ubuntu-24.04
+            python-version: '3.7'
+          - os: ubuntu-24.04
+            gdal-version: '3.4'
           - os: ubuntu-22.04
-            python-version: '3.6'
+            gdal-version: '3.4'
           - os: ubuntu-20.04
             python-version: '3.11'
           - os: ubuntu-20.04
@@ -27,6 +33,7 @@ jobs:
       with:
         python-version: ${{ matrix.python-version }}
     - name: install gdal
+      id: gdal
       run: |
         if [ "${{ matrix.os }}" = "ubuntu-20.04" ]
         then
@@ -43,20 +50,16 @@ jobs:
         echo "using version ->${APT_GDAL_VERSION}<-"
         apt-cache madison libgdal30 | grep "${APT_GDAL_VERSION}" && sudo apt-get install libgdal30="${APT_GDAL_VERSION}"
         sudo apt-get install python3-gdal="${APT_GDAL_VERSION}" libgdal-dev="${APT_GDAL_VERSION}"
+        echo gdal_version=$(echo "${APT_GDAL_VERSION}" | cut -f1 -d '+') >> $GITHUB_OUTPUT
     - name: Install dependencies for test
       run: |
         python -m pip install --upgrade pip wheel
         python -m pip install setuptools==57.*
         python -m pip freeze
-        if [ "${{ matrix.python-version }}" == "3.6" ]
-        then
-           echo "hack setup.cfg to accomodate python version <= 3.6"
-           sed -i 's/geopackage_validator.__version__/0.0.0/g' setup.cfg
-        fi
     - name: Install dependencies from config
       run: |
         # we need to pin GDAL here to match the python3-gdal
-        pip install GDAL==${{ matrix.gdal-version }}
+        pip install GDAL==${{steps.gdal.outputs.gdal_version}}
         pip3 install --no-cache-dir .[test]
     - name: Test with pytest
       run: |
diff --git a/.gitignore b/.gitignore
index 569579f..0f27ff8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -16,6 +16,7 @@ node_modules/
 doc/build/
 ansible/*.retry
 .venv
+/venv/
 build/
 
 # Unit test / coverage reports
@@ -33,4 +34,4 @@ coverage.xml
 
 # Docker
 docker-compose.override.yml
-.env
\ No newline at end of file
+.env
diff --git a/Dockerfile b/Dockerfile
index 22e004e..559717c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -13,7 +13,6 @@ WORKDIR /code
 
 COPY ./geopackage_validator /code/geopackage_validator
 COPY ./pyproject.toml /code/pyproject.toml
-COPY ./setup.cfg /code/setup.cfg
 COPY ./setup.py /code/setup.py
 
 # --- TEST-IMAGE ---
diff --git a/Dockerfile.local b/Dockerfile.local
index 894259a..960d24c 100644
--- a/Dockerfile.local
+++ b/Dockerfile.local
@@ -11,21 +11,19 @@ ARG GROUP_ID=1000
 ARG USER_NAME=pdok
 ARG GROUP_NAME=pdok
 
+RUN apk add --update --no-cache py3-pip
+
 RUN addgroup -g $GROUP_ID $GROUP_NAME && \
     adduser --shell /sbin/nologin --disabled-password \
     --uid $USER_ID --ingroup $GROUP_NAME $USER_NAME
 USER $USER_NAME
 
-ENV VIRTUAL_ENV=/home/pdok/venv
-RUN python3 -m venv --system-site-packages /home/pdok/venv
-ENV PATH="$VIRTUAL_ENV/bin:$PATH"
+ENV PYTHONUNBUFFERED=1
 
 RUN pip3 install setuptools pip virtualenv --upgrade
 COPY --chown=pdok:pdok . /code
 WORKDIR /code
 
-RUN . /home/pdok/venv/bin/activate && pip3 install -e .[test]
-
 ADD local_entrypoint.sh /entry/local_entrypoint.sh
 
 ENTRYPOINT [ "/entry/local_entrypoint.sh" ]
diff --git a/geopackage_validator/validations/geometry_dimension_check.py b/geopackage_validator/validations/geometry_dimension_check.py
index 6f0e1bd..fe53d42 100644
--- a/geopackage_validator/validations/geometry_dimension_check.py
+++ b/geopackage_validator/validations/geometry_dimension_check.py
@@ -25,9 +25,13 @@ def query_dimensions(dataset) -> Iterable[Tuple[str, str]]:
         validations = dataset.ExecuteSQL(
             DIMENSION_QUERY.format(table_name=table_name, geom_column_name=column_name)
         )
+        validation_list = (
+            []
+            if validations is None
+            else [(z, m, ndims) for z, m, ndims in validations]
+        )
 
-        if validations is not None:
-            validation_list = [(z, m, ndims) for z, m, ndims in validations]
+        if validation_list:
             four_dimensions = all(ndims == 4 for z, m, ndims in validation_list)
             m_coordinates_all_0 = all(m for z, m, ndims in validation_list)
             z_coordinates_all_0 = all(z for z, m, ndims in validation_list)
diff --git a/local_entrypoint.sh b/local_entrypoint.sh
index 03493a5..ac1b844 100755
--- a/local_entrypoint.sh
+++ b/local_entrypoint.sh
@@ -1,8 +1,11 @@
 #!/usr/bin/env sh
-
 # this entrypoint does just that: make sure the egg-info dir is available by installing (again) with pip.
-if [ ! -d ./pdok_geopackage_validator.egg-info/ ]
+if [ ! -d /code/pdok_geopackage_validator.egg-info/ ] || [ ! -d /code/venv/ ]
 then
-  pip3 install --no-cache-dir -e .
+  python3 -m venv --system-site-packages /code/venv
+  . /code/venv/bin/activate
+  pip3 install -e .[test]
+else
+  . /code/venv/bin/activate
 fi
 exec "$@"
diff --git a/pyproject.toml b/pyproject.toml
index 19cf58e..56e5aba 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -15,7 +15,28 @@ classifiers = [
     "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
 ]
-dynamic = ["version", "readme", "requires-python"]
+dynamic = ["version", "readme"]
+dependencies = [
+    "setuptools>=42.0,!=58.*,!=59.*,!=60.*,!=61.*",
+    "Click >= 8.0",
+    "click-log >=0.3",
+    "gdal >=3.0.4",
+    "minio",
+    "pyyaml",
+]
+requires-python = ">=3.6"
+
+[project.optional-dependencies]
+test = [
+    "black == 22.3.0",
+    "flake8",
+    "ipdb",
+    "ipython",
+    "pytest >= 7.0.1",
+    "pytest-cov",
+    "pytest-flakes",
+    "pytest-mock"
+]
 
 [project.scripts]
 geopackage-validator = "geopackage_validator.cli:cli"
diff --git a/setup.cfg b/setup.cfg
deleted file mode 100644
index c72ea1d..0000000
--- a/setup.cfg
+++ /dev/null
@@ -1,40 +0,0 @@
-[metadata]
-name = pdok_geopackage_validator
-version = 0.0.0
-description = "Validate Geopackage files according to PDOK requirements and recommendations"
-keywords = ["geopackage-validator", "geopackage", "pdok"]
-license = {text = "MIT"}
-classifiers =
-    "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3 :: Only",
-    "Programming Language :: Python :: 3.6",
-    "Programming Language :: Python :: 3.7",
-    "Programming Language :: Python :: 3.8",
-    "Programming Language :: Python :: 3.9"
-
-[options]
-python_requires = >=3.6
-install_requires =
-    setuptools>=42.0,!=58.*,!=59.*,!=60.*,!=61.*
-    Click >= 8.0
-    click-log >=0.3
-    gdal >=3.0.4
-    minio
-    pyyaml
-
-[options.extras_require]
-test =
-    black == 22.3.0
-    flake8
-    ipdb
-    ipython
-    pytest >= 7.0.1
-    pytest-cov
-    pytest-flakes
-    pytest-mock
-
-[tool:pytest]
-addopts = --cache-clear
-filterwarnings =
-    ignore:the imp module is deprecated in favour of importlib.*:DeprecationWarning
-    ignore:Using or importing the ABCs from 'collections' instead of from.*:DeprecationWarning