diff --git a/.github/workflows/python-tests.yml b/.github/workflows/python-tests.yml
index db04671..b1cf91d 100644
--- a/.github/workflows/python-tests.yml
+++ b/.github/workflows/python-tests.yml
@@ -18,12 +18,12 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
-        python-version: ["3.8", "3.12"]
+        python-version: ["3.9", "3.12"]
         include:
           - os: windows-latest
             python-version: "3.9"
           - os: ubuntu-latest
-            python-version: "pypy-3.8"
+            python-version: "pypy-3.9"
           - os: ubuntu-latest
             python-version: "3.10"
           - os: macos-latest
@@ -44,10 +44,12 @@ jobs:
       - uses: jupyterlab/maintainer-tools/.github/actions/report-coverage@v1
 
   docs:
-    runs-on: windows-latest
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
       - uses: jupyterlab/maintainer-tools/.github/actions/base-setup@v1
+        with:
+          python_version: 3.12
       - run: hatch run docs:build
 
   test_lint:
@@ -82,7 +84,7 @@ jobs:
       - name: Base Setup
         uses: jupyterlab/maintainer-tools/.github/actions/base-setup@v1
         with:
-          dependency_type: minimum
+          python_version: 3.9
       - name: Install with minimum versions and optional deps
         run: |
           pip install -e .[test]
diff --git a/jupyter_events/logger.py b/jupyter_events/logger.py
index 8cc1fba..00de2dd 100644
--- a/jupyter_events/logger.py
+++ b/jupyter_events/logger.py
@@ -10,9 +10,10 @@
 import typing as t
 import warnings
 from datetime import datetime, timezone
+from importlib.metadata import version
 
 from jsonschema import ValidationError
-from pythonjsonlogger import jsonlogger
+from packaging.version import parse
 from traitlets import Dict, Instance, Set, default
 from traitlets.config import Config, LoggingConfigurable
 
@@ -21,6 +22,13 @@
 from .traits import Handlers
 from .validators import JUPYTER_EVENTS_CORE_VALIDATOR
 
+# Check if the version is greater than 3.1.0
+version_info = version("python-json-logger")
+if parse(version_info) >= parse("3.1.0"):
+    from pythonjsonlogger.json import JsonFormatter
+else:
+    from pythonjsonlogger.jsonlogger import JsonFormatter  # type: ignore[attr-defined]
+
 # Increment this version when the metadata included with each event
 # changes.
 EVENTS_METADATA_VERSION = 1
@@ -171,7 +179,7 @@ def _handle_message_field(record: t.Any, **kwargs: t.Any) -> str:
                 del record["message"]
             return json.dumps(record, **kwargs)
 
-        formatter = jsonlogger.JsonFormatter(  # type:ignore [no-untyped-call]
+        formatter = JsonFormatter(
             json_serializer=_handle_message_field,
         )
         handler.setFormatter(formatter)
diff --git a/jupyter_events/schema.py b/jupyter_events/schema.py
index 49420e1..8c6bf85 100644
--- a/jupyter_events/schema.py
+++ b/jupyter_events/schema.py
@@ -3,7 +3,7 @@
 
 import json
 from pathlib import Path, PurePath
-from typing import Any, Dict, Union
+from typing import Any, Union
 
 from jsonschema import FormatChecker, validators
 from referencing import Registry
@@ -30,7 +30,7 @@ class EventSchemaFileAbsent(Exception):
     """An error for an absent event schema file."""
 
 
-SchemaType = Union[Dict[str, Any], str, PurePath]
+SchemaType = Union[dict[str, Any], str, PurePath]
 
 
 class EventSchema:
diff --git a/pyproject.toml b/pyproject.toml
index c07baca..d879aa8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -6,7 +6,7 @@ build-backend = "hatchling.build"
 name = "jupyter-events"
 description = "Jupyter Event System library"
 readme = "README.md"
-requires-python = ">=3.8"
+requires-python = ">=3.9"
 authors = [
     { name = "Jupyter Development Team", email = "jupyter@googlegroups.com" },
 ]
@@ -52,9 +52,10 @@ jupyter-events = "jupyter_events.cli:main"
 
 [project.optional-dependencies]
 docs = [
+    "sphinx>=8",
     "jupyterlite-sphinx",
     "myst_parser",
-    "pydata_sphinx_theme",
+    "pydata_sphinx_theme>=0.16",
     "sphinxcontrib-spelling",
 ]
 test = [
@@ -150,7 +151,7 @@ source = ["jupyter_events"]
 
 [tool.mypy]
 files = "jupyter_events"
-python_version = "3.8"
+python_version = "3.9"
 strict = true
 enable_error_code = ["ignore-without-code", "redundant-expr", "truthy-bool"]
 warn_unreachable = true
@@ -181,6 +182,7 @@ extend-select = [
   "EXE",         # flake8-executable
   "PYI",         # flake8-pyi
   "S",           # flake8-bandit
+  "G001",        # .format and co in logging methods
 ]
 ignore = [
   "E501",     # E501 Line too long (158 > 100 characters)
diff --git a/tests/test_logger.py b/tests/test_logger.py
index 8a0a499..28a8fc6 100644
--- a/tests/test_logger.py
+++ b/tests/test_logger.py
@@ -3,7 +3,6 @@
 import io
 import json
 import logging
-import sys
 from datetime import datetime, timedelta, timezone
 from unittest.mock import MagicMock
 
@@ -166,8 +165,6 @@ def test_emit():
         "__metadata_version__": 1,
         "something": "blah",
     }
-    if sys.version_info >= (3, 12):
-        expected["taskName"] = None
     assert event_capsule == expected
 
 
@@ -214,8 +211,6 @@ def test_message_field():
         "something": "blah",
         "message": "a message was seen",
     }
-    if sys.version_info >= (3, 12):
-        expected["taskName"] = None
     assert event_capsule == expected
 
 
@@ -263,8 +258,6 @@ def test_nested_message_field():
         "__metadata_version__": 1,
         "thing": {"message": "a nested message was seen"},
     }
-    if sys.version_info >= (3, 12):
-        expected["taskName"] = None
     assert event_capsule == expected
 
 
@@ -428,8 +421,6 @@ def test_unique_logger_instances():
         "__metadata_version__": 1,
         "something": "blah",
     }
-    if sys.version_info >= (3, 12):
-        expected["taskName"] = None
     assert event_capsule0 == expected
 
     event_capsule1 = json.loads(output1.getvalue())
@@ -443,8 +434,6 @@ def test_unique_logger_instances():
         "__metadata_version__": 1,
         "something": "blah",
     }
-    if sys.version_info >= (3, 12):
-        expected["taskName"] = None
     assert event_capsule1 == expected