diff --git a/appmap/__init__.py b/appmap/__init__.py
index 65e38973..a9fc2d35 100644
--- a/appmap/__init__.py
+++ b/appmap/__init__.py
@@ -4,7 +4,7 @@
 from _appmap.env import Env  # noqa: F401
 from _appmap.importer import instrument_module  # noqa: F401
 from _appmap.labels import labels  # noqa: F401
-from _appmap.noappmap import decorator as noappmap
+from _appmap.noappmap import decorator as noappmap  # noqa: F401
 from _appmap.recording import Recording  # noqa: F401
 
 try:
diff --git a/appmap/http.py b/appmap/http.py
index 3e5c4273..81d9fc9a 100644
--- a/appmap/http.py
+++ b/appmap/http.py
@@ -52,7 +52,7 @@ def putheader(self, orig, header, *values):
         if not hasattr(request, "headers"):
             request["headers"] = {}
         headers = request["headers"]
-        if not header in headers:
+        if header not in headers:
             headers[header] = []
         headers[header].extend(values)
         orig(self, header, *values)
diff --git a/appmap/labeling/__init__.py b/appmap/labeling/__init__.py
index 2d80994d..73b64571 100644
--- a/appmap/labeling/__init__.py
+++ b/appmap/labeling/__init__.py
@@ -8,7 +8,7 @@
 import yaml
 from importlib_resources import files
 
-from _appmap.labels import LabelSet
+from _appmap.labels import LabelSet  # noqa: F401
 
 
 @lru_cache(maxsize=None)
diff --git a/appmap/pytest.py b/appmap/pytest.py
index 6a1d3f13..3c3d54e6 100644
--- a/appmap/pytest.py
+++ b/appmap/pytest.py
@@ -80,5 +80,5 @@ def pytest_pyfunc_call(pyfuncitem):
             try:
                 with testing_framework.collect_result_metadata(metadata):
                     result.get_result()
-            except:  # pylint: disable=bare-except
+            except:  # pylint: disable=bare-except # noqa: E722
                 pass  # exception got recorded in metadata
diff --git a/appmap/unittest.py b/appmap/unittest.py
index 368b3089..c5af286d 100644
--- a/appmap/unittest.py
+++ b/appmap/unittest.py
@@ -4,4 +4,4 @@
 
 if not Env.current.is_appmap_repo and Env.current.enables("unittest"):
     logger.debug("Test recording is enabled (unittest)")
-    import _appmap.unittest  # pyright: ignore pylint: disable=unused-import
+    import _appmap.unittest  # pyright: ignore pylint: disable=unused-import # noqa: F401
diff --git a/pyproject.toml b/pyproject.toml
index 27a3f1ed..b0dc8117 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -79,6 +79,7 @@ uvicorn = "^0.27.1"
 fastapi = "^0.110.0"
 httpx = "^0.27.0"
 pytest-env = "^1.1.3"
+ruff = "^0.3.3"
 
 [build-system]
 requires = ["poetry-core>=1.1.0"]