diff --git a/.github/workflows/testing.yml b/.github/workflows/testing.yml
index ec871e5..ff2ee5e 100644
--- a/.github/workflows/testing.yml
+++ b/.github/workflows/testing.yml
@@ -3,7 +3,7 @@ name: Python testing
 on:
   push:
     branches:
-      - '**'
+      - "**"
   pull_request:
 
 jobs:
@@ -16,22 +16,21 @@ jobs:
         python-version: ["3.10", "3.11", "3.12"]
 
     steps:
-    - name: Checkout repository
-      uses: actions/checkout@v4
-      with:
-        # setuptools_scm requires a non-shallow clone of the repository
-        fetch-depth: 0
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          # setuptools_scm requires a non-shallow clone of the repository
+          fetch-depth: 0
 
-    - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v5
-      with:
-        python-version: ${{ matrix.python-version }}
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
 
-    - name: Install Python package
-      run: |
-        python -m pip install pytest
-        python -m pip install .
-    
-    - name: Run Python tests
-      run: |
-        python -m pytest
+      - name: Install Python package
+        run: |
+          python -m pip install .[tests]
+
+      - name: Run Python tests
+        run: |
+          python -m pytest
diff --git a/pyproject.toml b/pyproject.toml
index 300048d..a04a84a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -25,9 +25,18 @@ classifiers = [
 dependencies = ["numpy", "matplotlib", "pyqt6", "scipy", "shapely>=2", "tqdm"]
 
 [project.optional-dependencies]
-docs = ["sphinx", "sphinx_mdinclude", "sphinx_rtd_theme"]
-dev = ["pytest", "pytest-cov", "black"]
 extra = ["networkx"]
+docs = ["sphinx", "sphinx_mdinclude", "sphinx_rtd_theme"]
+tests = ["pytest", "pytest-cov"]
+dev = [
+    "pytest",
+    "pytest-cov",
+    "black",
+    "networkx",
+    "sphinx",
+    "sphinx_mdinclude",
+    "sphinx_rtd_theme",
+]
 
 [project.urls]
 Homepage = "https://github.com/ondrolexa/pypsbuilder"