diff --git a/.forgejo/workflows/test.yml b/.forgejo/workflows/test.yml
index d44e5ee..9d2de22 100644
--- a/.forgejo/workflows/test.yml
+++ b/.forgejo/workflows/test.yml
@@ -10,4 +10,5 @@ jobs:
     runs-on: docker
     steps:
       - uses: https://data.forgejo.org/actions/checkout@v6
-      - run: python3 -m unittest discover -s tests
+      - run: python3 -m pip install pytest
+      - run: python3 -m pytest -q
diff --git a/README.md b/README.md
index 6752ea5..7c044c1 100644
--- a/README.md
+++ b/README.md
@@ -3,9 +3,6 @@
 A small, dependency-free Forgejo Action that synchronizes a completed static
 website build to a dedicated Bunny Storage Zone.
 
-The runner needs Bash and Python 3.11 or newer. The action itself installs no
-packages and executes no code from the Gandalf repository.
-
 The deployer requires `index.html`, rejects symbolic links, compares files with
 a checksum manifest, uploads changed assets before HTML, deletes stale files
 only after successful uploads, and publishes the new manifest last.
@@ -60,7 +57,7 @@ Set `BUNNY_STORAGE_ENDPOINT` when the Storage Zone is outside Frankfurt.
 ## Development
 
 ```bash
-python3 -m unittest discover -s tests
+python3 -m pytest tests
 ```
 
 The canonical source lives in the private Gandalf infrastructure repository
diff --git a/tests/test_static_site.py b/tests/test_static_site.py
index 9487054..094b799 100644
--- a/tests/test_static_site.py
+++ b/tests/test_static_site.py
@@ -1,9 +1,8 @@
 import importlib.util
-import json
 from pathlib import Path
 import sys
-import tempfile
-import unittest
+
+import pytest
 
 MODULE_PATH = Path(__file__).resolve().parents[1] / "static_site.py"
 SPEC = importlib.util.spec_from_file_location("static_site_deploy", MODULE_PATH)
@@ -25,58 +24,47 @@ def write_site(root: Path) -> None:
     (root / "assets" / "app.js").write_text("console.log('hello')")
 
 
-class StaticSiteTests(unittest.TestCase):
-    def test_collect_files_requires_index(self) -> None:
-        with tempfile.TemporaryDirectory() as directory:
-            with self.assertRaisesRegex(DeployError, "index.html"):
-                collect_files(Path(directory))
-
-    def test_collect_files_rejects_symlinks(self) -> None:
-        with tempfile.TemporaryDirectory() as directory:
-            root = Path(directory)
-            write_site(root)
-            (root / "linked").symlink_to(root / "index.html")
-            with self.assertRaisesRegex(DeployError, "symbolic links"):
-                collect_files(root)
-
-    def test_manifest_round_trip(self) -> None:
-        with tempfile.TemporaryDirectory() as directory:
-            root = Path(directory)
-            write_site(root)
-            files = collect_files(root)
-            manifest = manifest_for(files)
-            parsed = parse_manifest(json.dumps(manifest).encode())
-            self.assertEqual(
-                parsed["index.html"]["sha256"], files["index.html"].sha256
-            )
-
-    def test_manifest_rejects_unsafe_remote_path(self) -> None:
-        raw = b'{"version": 1, "files": {"../other-site/index.html": {}}}'
-        with self.assertRaisesRegex(DeployError, "unsafe path"):
-            parse_manifest(raw)
-
-    def test_bunny_plan_uploads_assets_before_html_and_removes_stale(self) -> None:
-        with tempfile.TemporaryDirectory() as directory:
-            root = Path(directory)
-            write_site(root)
-            files = collect_files(root)
-            remote = {
-                "index.html": {"sha256": "old", "size": 1},
-                "assets/app.js": {"sha256": "old", "size": 1},
-                "old.css": {"sha256": "old", "size": 1},
-            }
-            upload, delete = bunny_plan(files, remote)
-            self.assertEqual(upload, ["assets/app.js", "index.html"])
-            self.assertEqual(delete, ["old.css"])
-
-    def test_bunny_plan_skips_unchanged_files(self) -> None:
-        with tempfile.TemporaryDirectory() as directory:
-            root = Path(directory)
-            write_site(root)
-            files = collect_files(root)
-            remote = manifest_for(files)["files"]
-            self.assertEqual(bunny_plan(files, remote), ([], []))
+def test_collect_files_requires_index(tmp_path):
+    with pytest.raises(DeployError, match="index.html"):
+        collect_files(tmp_path)
 
 
-if __name__ == "__main__":
-    unittest.main()
+def test_collect_files_rejects_symlinks(tmp_path):
+    write_site(tmp_path)
+    (tmp_path / "linked").symlink_to(tmp_path / "index.html")
+    with pytest.raises(DeployError, match="symbolic links"):
+        collect_files(tmp_path)
+
+
+def test_manifest_round_trip(tmp_path):
+    write_site(tmp_path)
+    files = collect_files(tmp_path)
+    manifest = manifest_for(files)
+    parsed = parse_manifest(__import__("json").dumps(manifest).encode())
+    assert parsed["index.html"]["sha256"] == files["index.html"].sha256
+
+
+def test_manifest_rejects_unsafe_remote_path():
+    raw = b'{"version": 1, "files": {"../other-site/index.html": {}}}'
+    with pytest.raises(DeployError, match="unsafe path"):
+        parse_manifest(raw)
+
+
+def test_bunny_plan_uploads_assets_before_html_and_removes_stale(tmp_path):
+    write_site(tmp_path)
+    files = collect_files(tmp_path)
+    remote = {
+        "index.html": {"sha256": "old", "size": 1},
+        "assets/app.js": {"sha256": "old", "size": 1},
+        "old.css": {"sha256": "old", "size": 1},
+    }
+    upload, delete = bunny_plan(files, remote)
+    assert upload == ["assets/app.js", "index.html"]
+    assert delete == ["old.css"]
+
+
+def test_bunny_plan_skips_unchanged_files(tmp_path):
+    write_site(tmp_path)
+    files = collect_files(tmp_path)
+    remote = manifest_for(files)["files"]
+    assert bunny_plan(files, remote) == ([], [])