diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
deleted file mode 100644
index 9ea5d9d..0000000
--- a/.github/workflows/build.yml
+++ /dev/null
@@ -1,43 +0,0 @@
-name: Test python-json-logger
-
-on: 
-  push:
-    branches:
-      - master
-  workflow_dispatch:
-    inputs:
-      logLevel:
-        description: 'Log level'
-        required: true
-        default: 'warning'
-        type: choice
-        options:
-        - info
-        - warning
-        - debug
-  pull_request:
-    types: [opened, reopened]
-
-jobs:
-  test:
-    runs-on: "ubuntu-20.04" #Moving down to 20.04 (latest is 22.04) because of python3.6 support
-    strategy:
-      fail-fast: false
-      matrix:
-        python-version: ["pypy-3.8", "pypy-3.9", "3.6", "3.7", "3.8", "3.9", "3.10", "3.11"]
-
-    steps:
-      - uses: actions/checkout@v3
-
-      - 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 tox tox-gh-actions
-
-      - name: Test with tox
-        run: tox
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
deleted file mode 100644
index ee269e8..0000000
--- a/.github/workflows/release.yml
+++ /dev/null
@@ -1,32 +0,0 @@
-name: Release python-json-logger build
-
-on: 
-  release:
-    types: [ created ]
-
-  workflow_dispatch:
-
-jobs:
-  publish:
-    runs-on: ubuntu-latest
-
-    steps:
-      - uses: actions/checkout@v3
-
-      - name: Set up Python 3.11
-        uses: actions/setup-python@v4
-        with:
-          python-version: 3.11
-
-      - name: Install dependencies
-        run: |
-          python -m pip install --upgrade pip
-          pip install setuptools wheel twine typing_extensions
-
-      - name: Build and Upload to PyPi
-        run: |
-          python setup.py sdist bdist_wheel
-          python -m twine upload dist/*
-        env:
-          TWINE_USERNAME: __token__
-          TWINE_PASSWORD: ${{ secrets.PYPI_API_TOKEN }}
diff --git a/.github/workflows/test-suite.yml b/.github/workflows/test-suite.yml
new file mode 100644
index 0000000..91a22d4
--- /dev/null
+++ b/.github/workflows/test-suite.yml
@@ -0,0 +1,47 @@
+name: Test python-json-logger
+
+on:
+  push:
+    branches:
+      - main
+
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  test:
+    name: "Python ${{matrix.python-version}} ${{ matrix.os }}"
+    runs-on: "${{ matrix.os }}"
+    strategy:
+      matrix:
+        python-version:
+          - "pypy-3.7"
+          - "pypy-3.8"
+          - "pypy-3.9"
+          - "pypy-3.10"
+          - "3.7"
+          - "3.8"
+          - "3.9"
+          - "3.10"
+          - "3.11"
+          - "3.12"
+        os:
+          - ubuntu-latest
+          - windows-latest
+          - macos-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install tox tox-gh-actions
+
+      - name: Test with tox
+        run: tox
diff --git a/setup.py b/setup.py
index 74320b3..a5a84de 100644
--- a/setup.py
+++ b/setup.py
@@ -8,7 +8,7 @@
 
 setup(
     name="python-json-logger",
-    version="2.0.7",
+    version="3.0.0.dev1",
     url="http://github.com/madzak/python-json-logger",
     license="BSD",
     include_package_data=True,
@@ -21,7 +21,7 @@
     package_data={"pythonjsonlogger": ["py.typed"]},
     packages=find_packages("src", exclude="tests"),
     # https://packaging.python.org/guides/distributing-packages-using-setuptools/#python-requires
-    python_requires=">=3.6",
+    python_requires=">=3.7",
     test_suite="tests.tests",
     classifiers=[
         'Development Status :: 6 - Mature',
@@ -30,12 +30,13 @@
         'Operating System :: OS Independent',
         'Programming Language :: Python',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.6',
+        'Programming Language :: Python :: 3 :: Only',
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',
         'Programming Language :: Python :: 3.9',
         'Programming Language :: Python :: 3.10',
         'Programming Language :: Python :: 3.11',
+        'Programming Language :: Python :: 3.12',
         'Topic :: System :: Logging',
     ]
 )
diff --git a/src/pythonjsonlogger/jsonlogger.py b/src/pythonjsonlogger/jsonlogger.py
index 519a64d..2b72f54 100644
--- a/src/pythonjsonlogger/jsonlogger.py
+++ b/src/pythonjsonlogger/jsonlogger.py
@@ -2,12 +2,14 @@
 This library is provided to allow standard python logging
 to output log data as JSON formatted strings
 """
+
 import logging
 import json
 import re
 import traceback
 import importlib
 from datetime import date, datetime, time, timezone
+import sys
 from typing import Any, Callable, Dict, List, Optional, Tuple, Union
 
 from inspect import istraceback
@@ -16,7 +18,8 @@
 
 # skip natural LogRecord attributes
 # http://docs.python.org/library/logging.html#logrecord-attributes
-RESERVED_ATTRS: Tuple[str, ...] = (
+# Changed in 3.0.0, is now list[str] instead of tuple[str, ...]
+RESERVED_ATTRS: List[str] = [
     "args",
     "asctime",
     "created",
@@ -39,7 +42,11 @@
     "stack_info",
     "thread",
     "threadName",
-)
+]
+
+if sys.version_info >= (3, 12):
+    # taskName added in python 3.12
+    RESERVED_ATTRS.append("taskName")
 
 OptionalCallableOrStr = Optional[Union[Callable, str]]
 
@@ -63,9 +70,7 @@ def merge_record_extra(
         rename_fields = {}
     for key, value in record.__dict__.items():
         # this allows to have numeric keys
-        if key not in reserved and not (
-            hasattr(key, "startswith") and key.startswith("_")
-        ):
+        if key not in reserved and not (hasattr(key, "startswith") and key.startswith("_")):
             target[rename_fields.get(key, key)] = value
     return target
 
@@ -79,10 +84,10 @@ def default(self, obj):
         if isinstance(obj, (date, datetime, time)):
             return self.format_datetime_obj(obj)
 
-        elif istraceback(obj):
+        if istraceback(obj):
             return "".join(traceback.format_tb(obj)).strip()
 
-        elif type(obj) == Exception or isinstance(obj, Exception) or type(obj) == type:
+        if type(obj) == Exception or isinstance(obj, Exception) or type(obj) == type:
             return str(obj)
 
         try:
@@ -117,9 +122,9 @@ def __init__(
         prefix: str = "",
         rename_fields: Optional[dict] = None,
         static_fields: Optional[dict] = None,
-        reserved_attrs: Tuple[str, ...] = RESERVED_ATTRS,
+        reserved_attrs: Union[Tuple[str, ...], List[str]] = RESERVED_ATTRS,
         timestamp: Union[bool, str] = False,
-        **kwargs: Any
+        **kwargs: Any,
     ):
         """
         :param json_default: a function for encoding non-standard objects
@@ -197,8 +202,7 @@ def parse(self) -> List[str]:
 
         if self._fmt:
             return formatter_style_pattern.findall(self._fmt)
-        else:
-            return []
+        return []
 
     def add_fields(
         self,
diff --git a/tox.ini b/tox.ini
index 8eafd27..b611567 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,17 +1,19 @@
 [tox]
 requires = tox>=3
-envlist = lint, type, pypy{38,39}, py{36,37,38,39,310,311}
+envlist = lint, type, pypy{37,38,39,310}, py{37,38,39,310,311,312}
 
 [gh-actions]
 python =
+  pypy-3.7: pypy37
   pypy-3.8: pypy38
   pypy-3.9: pypy39
-  3.6: py36
+  pypy-3.10: pypy310
   3.7: py37
   3.8: py38
   3.9: py39
   3.10: py310
-  3.11: py311, type
+  3.11: py311
+  3.12: py312, type
 
 [testenv]
 description = run unit tests