diff --git a/.github/workflows/build-and-deploy-on-pypi.yml b/.github/workflows/build-and-deploy-on-pypi.yml
index cf08f40..fd7ac1d 100644
--- a/.github/workflows/build-and-deploy-on-pypi.yml
+++ b/.github/workflows/build-and-deploy-on-pypi.yml
@@ -13,7 +13,7 @@ jobs:
     name: Build and publish PyActiveStorage on PyPi
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
       - name: Set up Python 3.13
diff --git a/.github/workflows/create-condalock-file.yml b/.github/workflows/create-condalock-file.yml
index 86d67d7..6a10efb 100644
--- a/.github/workflows/create-condalock-file.yml
+++ b/.github/workflows/create-condalock-file.yml
@@ -20,7 +20,7 @@ jobs:
     name: Create and verify conda lock file for latest Python
     runs-on: 'ubuntu-latest'
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
       - uses: conda-incubator/setup-miniconda@v3
diff --git a/.github/workflows/install-from-condalock-file.yml b/.github/workflows/install-from-condalock-file.yml
index 5ff5322..4448895 100644
--- a/.github/workflows/install-from-condalock-file.yml
+++ b/.github/workflows/install-from-condalock-file.yml
@@ -25,7 +25,7 @@ jobs:
       fail-fast: false
     name: Linux Python ${{ matrix.python-version }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
       - uses: conda-incubator/setup-miniconda@v3
diff --git a/.github/workflows/run-test-push.yml b/.github/workflows/run-test-push.yml
index 3347181..716bc23 100644
--- a/.github/workflows/run-test-push.yml
+++ b/.github/workflows/run-test-push.yml
@@ -17,7 +17,7 @@ jobs:
       fail-fast: false
     name: Linux Python ${{ matrix.python-version }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
       - uses: conda-incubator/setup-miniconda@v3
@@ -27,6 +27,7 @@ jobs:
           python-version: ${{ matrix.python-version }}
           miniforge-version: "latest"
           use-mamba: true
+          mamba-version: "2.0.5"  # https://github.com/conda-incubator/setup-miniconda/issues/392
       - run: conda --version
       - run: python -V
       - name: Install development version of NCAS-CMS/Pyfive:wacasoft
@@ -39,4 +40,4 @@ jobs:
       - run: pip install -e .
       - run: conda list
       - run: pytest -n 2 --junitxml=report-1.xml
-      - uses: codecov/codecov-action@v3
+      - uses: codecov/codecov-action@v5
diff --git a/.github/workflows/run-tests.yml b/.github/workflows/run-tests.yml
index 8a27803..bb5719c 100644
--- a/.github/workflows/run-tests.yml
+++ b/.github/workflows/run-tests.yml
@@ -22,7 +22,7 @@ jobs:
       fail-fast: false
     name: Linux Python ${{ matrix.python-version }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
       - uses: conda-incubator/setup-miniconda@v3
@@ -32,6 +32,7 @@ jobs:
           python-version: ${{ matrix.python-version }}
           miniforge-version: "latest"
           use-mamba: true
+          mamba-version: "2.0.5"  # https://github.com/conda-incubator/setup-miniconda/issues/392
       - run: conda --version
       - run: python -V
       - name: Install development version of NCAS-CMS/Pyfive:wacasoft
@@ -54,7 +55,7 @@ jobs:
       fail-fast: false
     name: OSX Python ${{ matrix.python-version }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
       - uses: conda-incubator/setup-miniconda@v3
@@ -64,6 +65,7 @@ jobs:
           python-version: ${{ matrix.python-version }}
           miniforge-version: "latest"
           use-mamba: true
+          mamba-version: "2.0.5"  # https://github.com/conda-incubator/setup-miniconda/issues/392
       - run: conda --version
       - run: python -V
       - name: Install development version of NCAS-CMS/Pyfive:wacasoft
diff --git a/.github/workflows/test_s3_minio.yml b/.github/workflows/test_s3_minio.yml
index 1232d76..4c9a3ef 100644
--- a/.github/workflows/test_s3_minio.yml
+++ b/.github/workflows/test_s3_minio.yml
@@ -6,8 +6,7 @@ on:
   push:
     branches:
       - main  # keep this at all times
-      # - pyfive  # reinstate
-      - new_api_pyfive
+      - pyfive
   pull_request:
   schedule:
     - cron: '0 0 * * *'  # nightly
@@ -26,7 +25,7 @@ jobs:
       fail-fast: false
     name: Linux Python ${{ matrix.python-version }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
       - uses: conda-incubator/setup-miniconda@v3
@@ -34,6 +33,7 @@ jobs:
           python-version: ${{ matrix.python-version }}
           miniforge-version: "latest"
           use-mamba: true
+          mamba-version: "2.0.5"  # https://github.com/conda-incubator/setup-miniconda/issues/392
       - name: Get conda and Python versions
         run: |
           conda --version
@@ -57,6 +57,7 @@ jobs:
           python-version: ${{ matrix.python-version }}
           miniforge-version: "latest"
           use-mamba: true
+          mamba-version: "2.0.5"  # https://github.com/conda-incubator/setup-miniconda/issues/392
       - name: Install development version of NCAS-CMS/Pyfive:wacasoft
         run: |
           cd ..
@@ -88,10 +89,10 @@ jobs:
       - name: Stop minio object storage
         run: tests/s3_exploratory/minio_scripts/minio-stop
         if: always()
-      - name: Upload HTML report artifact
-        uses: actions/upload-artifact@v4
-        with:
-          name: html-report
-          path: test-reports/
-          overwrite: true
-        if: always()
+      #- name: Upload HTML report artifact
+      #  uses: actions/upload-artifact@v4
+      #  with:
+      #    name: html-report
+      #    path: test-reports/
+      #    overwrite: true
+      #  if: always()