diff --git a/.github/workflows/zarr-dev.yml b/.github/workflows/zarr-dev.yml
deleted file mode 100644
index 6f6be385..00000000
--- a/.github/workflows/zarr-dev.yml
+++ /dev/null
@@ -1,47 +0,0 @@
----
-name: Build using Zarr development branch
-
-on: [push, pull_request]
-
-jobs:
-  test:
-    name: ${{ matrix.platform }} ${{ matrix.python-version }}
-    runs-on: ${{ matrix.platform }}
-
-    strategy:
-      fail-fast: true
-      matrix:
-        platform: [ubuntu-latest]
-        python-version: [3.8]
-
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v2
-
-      - name: Setup miniconda
-        uses: conda-incubator/setup-miniconda@v2
-        with:
-          auto-update-conda: true
-          channels: conda-forge,ome
-          environment-file: environment.yml
-          python-version: ${{ matrix.python-version }}
-
-      - name: Install Linux dependencies
-        if: matrix.platform == 'ubuntu-latest'
-        run: |
-          sudo apt install libxkbcommon-x11-0
-          /sbin/start-stop-daemon --start --quiet \
-            --pidfile /tmp/custom_xvfb_99.pid --make-pidfile \
-            --background --exec /usr/bin/Xvfb \
-            -- :99 -screen 0 1920x1200x24 -ac +extension GLX
-
-      - name: Install dependencies
-        shell: bash -l {0}
-        run: |
-          python -m pip install --upgrade pip wheel pytest tox
-          python -m pip install \
-          git+https://github.com/zarr-developers/zarr-python.git
-
-      - name: Run pytest
-        shell: bash -l {0}
-        run: pytest
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 856340a4..d38cb35a 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -7,7 +7,7 @@ repos:
       - id: seed-isort-config
 
   - repo: https://github.com/PyCQA/isort
-    rev: 5.10.1
+    rev: 5.12.0
     hooks:
       - id: isort