diff --git a/.github/workflows/pylint.yml b/.github/workflows/pylint.yml
new file mode 100644
index 0000000..17565ef
--- /dev/null
+++ b/.github/workflows/pylint.yml
@@ -0,0 +1,21 @@
+name: Ruff Check
+
+on: [push, pull_request]
+permissions:
+  contents: read
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v4
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install ruff
+    - name: Analysing the code with pylint
+      run: |
+        ruff check
diff --git a/koerce/__init__.py b/koerce/__init__.py
index 59f0e93..fcc8be1 100644
--- a/koerce/__init__.py
+++ b/koerce/__init__.py
@@ -5,13 +5,13 @@
 from ._internal import *  # noqa: F403
 
 
-class _Variable(Deferred):
+class _Variable(Deferred):  #noqa: F405
     def __init__(self, name: str):
-        builder = Var(name)
+        builder = Var(name)  # noqa: F405
         super().__init__(builder)
 
     def __pos__(self):
-        return Capture(self)
+        return Capture(self)  # noqa: F405
 
     def __neg__(self):
         return self
@@ -50,8 +50,8 @@ def var(name):
 
 
 def namespace(module):
-    p = _Namespace(pattern, module)
-    d = _Namespace(deferred, module)
+    p = _Namespace(pattern, module)  # noqa: F405
+    d = _Namespace(deferred, module)  # noqa: F405
     return p, d
 
 
@@ -59,7 +59,7 @@ def replace(matcher):
     """More convenient syntax for replacing a value with the output of a function."""
 
     def decorator(replacer):
-        return Replace(matcher, replacer)
+        return Replace(matcher, replacer)  # noqa: F405
 
     return decorator
 
@@ -72,8 +72,8 @@ def __init__(self):
 
 
 def koerce(
-    pat: Pattern, value: Any, context: Context = None, allow_coercion: bool = False
-) -> Any:
+    pat: Pattern, value: Any, context: Context = None, allow_coercion: bool = False  # noqa: F405
+) -> Any:  # noqa: F405
     """Match a value against a pattern.
 
     Parameters
@@ -106,10 +106,10 @@ def koerce(
     ... ]
 
     """
-    pat = pattern(pat, allow_coercion=allow_coercion)
+    pat = pattern(pat, allow_coercion=allow_coercion) # noqa: F405
     try:
         return pat.apply(value, context)
-    except MatchError:
+    except MatchError: # noqa: F405
         return NoMatch
 
 
diff --git a/koerce/annots.py b/koerce/annots.py
index 092a787..3c3a8ca 100644
--- a/koerce/annots.py
+++ b/koerce/annots.py
@@ -838,7 +838,7 @@ def __call__(cls, *args, **kwargs):
 class Singleton(Abstract):
     """Cache instances of the class based on instantiation arguments."""
 
-    __instances__: Mapping[Any, Self] = WeakValueDictionary()
+    __instances__: Mapping[Any, typing.Self] = WeakValueDictionary()
     __slots__ = ("__weakref__",)
 
 
diff --git a/koerce/tests/test_y.py b/koerce/tests/test_y.py
index 9c0d564..20a768c 100644
--- a/koerce/tests/test_y.py
+++ b/koerce/tests/test_y.py
@@ -5,13 +5,6 @@
 from typing import ClassVar, Generic
 
 import pytest
-
-pydantic = pytest.importorskip("pydantic")
-msgspec = pytest.importorskip("msgspec")
-
-# from ibis.common.grounds import Annotable as IAnnotable
-from pydantic import BaseModel, validate_call
-from pydantic_core import SchemaValidator
 from typing_extensions import TypeVar
 
 from koerce import (
@@ -21,6 +14,11 @@
     annotated,
 )
 
+msgspec = pytest.importorskip("msgspec")
+pydantic = pytest.importorskip("pydantic")
+from pydantic import BaseModel, validate_call  # noqa: E402
+from pydantic_core import SchemaValidator  # noqa: E402
+
 T = TypeVar("T")
 S = TypeVar("S")
 U = TypeVar("U")