diff --git a/README.md b/README.md
index 8f3bcad..84e52da 100644
--- a/README.md
+++ b/README.md
@@ -2,3 +2,5 @@
 
 This project allows testing all possible interactions between pytask, pytask-parallel
 and coiled.
+
+Requires Python 3.11 or newer.
diff --git a/pyproject.toml b/pyproject.toml
index ff0a7ea..a3d9a25 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -11,7 +11,7 @@ dependencies = [
     "s3fs>=2024.3.1",
 ]
 readme = "README.md"
-requires-python = ">= 3.8"
+requires-python = ">=3.11"
 
 [project.optional-dependencies]
 coiled = [
@@ -52,15 +52,14 @@ dev-dependencies = []
 allow-direct-references = true
 
 [tool.ruff]
-target-version = "py38"
+target-version = "py311"
 fix = true
 unsafe-fixes = true
 
 [tool.ruff.lint]
 extend-ignore = [
-    "ANN101",  # type annotating self
-    "ANN102",  # type annotating cls
     "ANN401",  # flake8-annotate typing.Any
+    "CPY001",  # Copyright notices are not required.
     "COM812",  # Comply with ruff-format.
     "ISC001",  # Comply with ruff-format.
     "D",
diff --git a/src/project/task_data_catalog.py b/src/project/task_data_catalog.py
index fa36846..01a5edf 100644
--- a/src/project/task_data_catalog.py
+++ b/src/project/task_data_catalog.py
@@ -1,8 +1,8 @@
+from typing import Annotated
 from typing import cast
 
 from pytask import PickleNode
 from pytask import Product
-from typing_extensions import Annotated
 
 from project.config import BLD
 from project.config import data_catalog
diff --git a/src/project/task_local_path.py b/src/project/task_local_path.py
index 49795b4..b367d14 100644
--- a/src/project/task_local_path.py
+++ b/src/project/task_local_path.py
@@ -1,7 +1,7 @@
 from pathlib import Path
+from typing import Annotated
 
 from pytask import Product
-from typing_extensions import Annotated
 
 from project.config import BLD
 
diff --git a/src/project/task_python_nodes.py b/src/project/task_python_nodes.py
index 7bd593a..c14c668 100644
--- a/src/project/task_python_nodes.py
+++ b/src/project/task_python_nodes.py
@@ -1,6 +1,7 @@
+from typing import Annotated
+
 from pytask import Product
 from pytask import PythonNode
-from typing_extensions import Annotated
 
 from project.config import BLD