diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index c28d9096..265e700c 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -4,67 +4,30 @@ on: [push, pull_request]
 
 jobs:
   test:
-    name: Test ${{ matrix.os }} / ${{ matrix.toxenv }}
+    name: Test ${{ matrix.os }}-python${{ matrix.python-version }}
     runs-on: ${{ matrix.os }}
     strategy:
       fail-fast: false
       matrix:
-        include:
-          - {os: windows-latest, python_Version: '3.11', toxenv: 'py311'}
-          - {os: windows-latest, python_Version: '3.10', toxenv: 'py310'}
-          - {os: windows-latest, python_Version: '3.8', toxenv: 'py38'}
-          - {os: windows-latest, python_Version: '3.9', toxenv: 'py39'}
-          - {os: ubuntu-latest, python_Version: '3.11', toxenv: 'py311'}
-          - {os: ubuntu-latest, python_Version: '3.10', toxenv: 'py310'}
-          - {os: ubuntu-latest, python_Version: '3.8', toxenv: 'py38'}
-          - {os: ubuntu-latest, python_Version: '3.9', toxenv: 'py39'}
-          - {os: macos-latest, python_Version: '3.11', toxenv: 'py311'}
-          - {os: macos-latest, python_Version: '3.10', toxenv: 'py310'}
-          - {os: macos-latest, python_Version: '3.8', toxenv: 'py38'}
-          # missing numcodecs wheels on 3.9. conda not yet an option. see gh-51
-          # {os: macos-latest, python_Version: '3.9', toxenv: 'py39'}
-
+        python-version: ['3.8', '3.9', '3.10', '3.11', '3.12']
+        os: ['windows-latest', 'macos-latest', 'ubuntu-latest']
     steps:
       - uses: actions/checkout@v4
 
-      - uses: actions/setup-python@v4
-        name: Install Python ${{ matrix.python_version }}
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v4
         with:
-          python-version: ${{ matrix.python_version }}
-
-      - name: Install ubuntu libraries
-        if: startsWith(matrix.os, 'ubuntu')
-        run: "\
-            sudo apt-get install -y \
-            libdbus-1-3 libxkbcommon-x11-0 libxcb-icccm4 \
-            libxcb-image0 libxcb-keysyms1 libxcb-randr0 \
-            libxcb-render-util0 libxcb-xinerama0 \
-            libxcb-xinput0 libxcb-xfixes0"
-
-      - name: Install & test
-        run: |
-          python -m pip install tox
-          tox -e ${{ matrix.toxenv }}
-
-  test_coverage:
-    name: Test coverage
-    runs-on: macos-latest
-    steps:
-      - uses: actions/checkout@v3
-
-      - uses: actions/setup-python@v4
-        name: Install Python '3.10'
-        with:
-          python-version: '3.10'
+          python-version: ${{ matrix.python-version }}
 
       - name: Install dependencies
         run: |
-          python -m pip install -r requirements/requirements-dev.txt
-
-      - name: Test
-        run: tox -e  'py310-coverage'
+            python -m pip install --upgrade pip
+            python -m pip install tox tox-gh-actions
+      - name: Test with tox
+        run: tox --conf tox.ini
 
-      - uses: codecov/codecov-action@v2
+      - name: Upload code coverage
+        uses: codecov/codecov-action@v2
         with:
           file: ./coverage.xml
-          fail_ci_if_error: false
+          fail_ci_if_error: true
diff --git a/.gitignore b/.gitignore
index 8ddc68ae..2381e93c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,3 +6,8 @@ build
 dist/
 target/
 docs/build/
+
+# Testing files
+.tox*
+.coverage*
+coverage.xml
diff --git a/CHANGELOG.md b/CHANGELOG.md
index f32a4198..200834c8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+# 0.8.4 (unreleased)
+
+- Correctly specify maximum compatible fsspec version. ([#338](https://github.com/ome/ome-zarr-py/pull/338))
+- Add tests on Python 3.12. ([#338](https://github.com/ome/ome-zarr-py/pull/338))
+
 # 0.8.3 (November 2023)
 
 - Fix reading HCS file on AWS S3 ([#322](https://github.com/ome/ome-zarr-py/pull/322))
diff --git a/requirements/requirements-test.txt b/requirements/requirements-test.txt
index 9cf84846..9955decc 100644
--- a/requirements/requirements-test.txt
+++ b/requirements/requirements-test.txt
@@ -1,3 +1,2 @@
 pytest
 pytest-cov
-codecov
diff --git a/setup.py b/setup.py
index 87285aac..56c0145f 100644
--- a/setup.py
+++ b/setup.py
@@ -19,7 +19,7 @@ def read(fname):
 install_requires += (["dask"],)
 install_requires += (["distributed"],)
 install_requires += (["zarr>=2.8.1"],)
-install_requires += (["fsspec[s3]>=0.8,!=2021.07.0,!=2023.09.0"],)
+install_requires += (["fsspec[s3]>=0.8,!=2021.07.0"],)
 # See https://github.com/fsspec/filesystem_spec/issues/819
 install_requires += (["aiohttp<4"],)
 install_requires += (["requests"],)
diff --git a/tox.ini b/tox.ini
index e6e81c92..7b50ac0f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,26 +1,18 @@
-# tox (https://tox.readthedocs.io/) is a tool for running tests
-# in multiple virtualenvs. This configuration file will run the
-# test suite on all supported python versions. To use it, "pip install tox"
-# and then run "tox" from this directory.
-
 [tox]
-envlist = py{38,39,310,311}
+envlist = py{38,39,310,311,312}
+
+
+[gh-actions]
+python =
+    3.8: py38
+    3.9: py39
+    3.10: py310
+    3.11: py311
+    3.12: py312
 
 [testenv]
-# passenv = DISPLAY XAUTHORITY
-passenv = GITHUB_ACTIONS
 deps =
-    -rrequirements/requirements-dev.txt
-    pytest-xvfb ; sys_platform == 'linux'
-
-commands =
-    pytest {posargs:tests -s}
+    -r requirements/requirements-test.txt
 
-[testenv:py310-coverage]
-passenv =
-    CI
-    GITHUB_ACTIONS
-usedevelop = true
 commands =
-    pytest --cov-report=xml --cov=./ome_zarr  --cov-append {posargs:-v}
-    codecov -f codecov.xml
+    pytest --cov-report=xml --cov=./ome_zarr  --cov-append {posargs}