diff --git a/.github/workflows/test-lint-go.yml b/.github/workflows/test-lint-go.yml
index ce5bc93..ab8a6d9 100644
--- a/.github/workflows/test-lint-go.yml
+++ b/.github/workflows/test-lint-go.yml
@@ -27,7 +27,8 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install pytest numpy 
+          pip install -e .
+          pip install pytest numpy
       - name: Run pytest
         run: pytest
         
@@ -40,12 +41,12 @@ jobs:
         uses: actions/setup-python@v5
         with:
           python-version: '3.13'
+      - name: Setup uv
+        uses: astral-sh/setup-uv@v5
       - name: Install dependencies
-        run: |
-          python -m pip install --upgrade pip
-          pip install flake8
+        run: uv sync --frozen --group dev
       - name: Run flake8
-        run: flake8 .
+        run: uv run flake8 .
 
   spellcheck:
     runs-on: ubuntu-latest
@@ -56,12 +57,12 @@ jobs:
         uses: actions/setup-python@v5
         with:
           python-version: '3.13'
+      - name: Setup uv
+        uses: astral-sh/setup-uv@v5
       - name: Install dependencies
-        run: |
-          python -m pip install --upgrade pip
-          pip install codespell
+        run: uv sync --frozen --group dev
       - name: Run codespell
-        run: codespell
+        run: uv run codespell
 
   type-check:
     runs-on: ubuntu-latest
@@ -72,12 +73,12 @@ jobs:
         uses: actions/setup-python@v5
         with:
           python-version: '3.13'
+      - name: Setup uv
+        uses: astral-sh/setup-uv@v5
       - name: Install dependencies
-        run: |
-          python -m pip install --upgrade pip
-          pip install mypy
+        run: uv sync --frozen --group dev
       - name: Run mypy
-        run: mypy mockito
+        run: uv run mypy mockito
 
   deploy:
     if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags')
diff --git a/CHANGES.txt b/CHANGES.txt
index 509b4fb..f6f0acf 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -4,6 +4,8 @@ MOCKITO CHANGE LOG
 
 Release 2.0.0
 ---------------------------------
+- Packaging is now fully defined via ``pyproject.toml`` (``hatchling`` backend);
+  the obsolete ``setup.py`` shim has been removed.
 - Calling `thenAnswer()` without arguments is now allowed and is treated like
   `thenReturn()` without arguments: the stubbed method will return `None`.
 - Deprecate `verifyNoMoreInteractions` in favor of `ensureNoUnverifiedInteractions`.
diff --git a/docs/conf.py b/docs/conf.py
index 6c66f4b..464a9da 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -67,7 +67,7 @@
     release = metadata.version("mockito")
 except metadata.PackageNotFoundError:
     print("mockito must be installed to build the documentation.")
-    print("Install from source using `uv sync` or `pip install -e .` in a virtualenv.")
+    print("Install from source using `uv sync` in the project root.")
     sys.exit(1)
 
 if 'dev' in release:
diff --git a/setup.py b/setup.py
deleted file mode 100755
index 21d3293..0000000
--- a/setup.py
+++ /dev/null
@@ -1,26 +0,0 @@
-from setuptools import setup
-
-setup(name='mockito',
-      version='0.0.0',
-      packages=['mockito'],
-      url='https://github.com/kaste/mockito-python',
-      maintainer='herr.kaste',
-      maintainer_email='herr.kaste@gmail.com',
-      license='MIT',
-      description='Spying framework',
-      long_description=open('README.rst').read(),
-      python_requires='>=3.8',
-      classifiers=[
-          'Development Status :: 5 - Production/Stable',
-          'Intended Audience :: Developers',
-          'License :: OSI Approved :: MIT License',
-          'Topic :: Software Development :: Testing',
-          'Programming Language :: Python :: 3',
-          'Programming Language :: Python :: 3.8',
-          'Programming Language :: Python :: 3.9',
-          'Programming Language :: Python :: 3.10',
-          'Programming Language :: Python :: 3.11',
-          'Programming Language :: Python :: 3.12',
-          'Programming Language :: Python :: 3.13',
-          'Programming Language :: Python :: 3.14',
-      ])