diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e3d3a00..040ba0d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -7,12 +7,11 @@ on:
     branches: [ main ]
 
 env:
-  python_cache_macOS_path: |
-    ~/Library/Caches/pip
-  python_cache_windows_path: |
-    ~\AppData\Local\pip\Cache
-  python_cache_ubuntu_path: |
-    ~/.cache/pip
+  python_cache_macOS_path: ~/Library/Caches/pip
+  python_cache_windows_path: ~\AppData\Local\pip\Cache
+  python_cache_ubuntu_path: ~/.cache/pip
+  pipenv_version: 2021.11.9 # FIXME upgrade pipenv when https://github.com/pypa/pipenv/issues/4430 is actually fixed
+
 jobs:
   # Check that a news file has been added to this branch when a PR is created
   assert-news:
@@ -57,10 +56,12 @@ jobs:
         # normal dependencies from setup.py).
         # This code also forces the system to install latest tools as the ones present on the CI system may be too old
         # for the process to go through properly.
+        # FIXME upgrade pipenv when https://github.com/pypa/pipenv/issues/4430 is actually fixed
         run: |
           python -m pip install --upgrade pip wheel setuptools
-          python -m pip install flake8 pipenv pytest
-          python -m pipenv lock --dev -r --pre > dev-requirements.txt
+          python -m pip install pipenv==${{ env.pipenv_version }}
+          echo "Locking dependencies"
+          python -m pipenv lock --dev -r > dev-requirements.txt
       - uses: FranzDiebold/github-env-vars-action@v2
       - name: Load Python Dependencies from cache
         uses: actions/cache@v2
@@ -94,10 +95,12 @@ jobs:
         # normal dependencies from setup.py).
         # This code also forces the system to install latest tools as the ones present on the CI system may be too old
         # for the process to go through properly.
+        # FIXME upgrade when https://github.com/pypa/pipenv/issues/4430 is actually fixed
         run: |
           python -m pip install --upgrade pip wheel setuptools
-          python -m pip install flake8 pipenv pytest
-          python -m pipenv lock --dev -r --pre > dev-requirements.txt
+          python -m pip install pipenv==${{ env.pipenv_version }}
+          echo "Locking dependencies"
+          python -m pipenv lock --dev -r > dev-requirements.txt
       - uses: FranzDiebold/github-env-vars-action@v2
       - name: Load Python Dependencies from cache
         uses: actions/cache@v2
@@ -150,28 +153,30 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, macOS-latest, windows-latest]
+        os: [ubuntu-latest ] # FIXME add other platforms when much quicker macOS-latest, windows-latest]
         python-version: ["3.7", "3.8", "3.9", "3.10"]
         multi-platform:
           - ${{ github.ref == 'refs/heads/main' || github.event_name == 'workflow_dispatch' }}
-#        include:
-#          - os: windows-latest
-#            cache_path: ${{ env.python_cache_windows_path }}
-#          - os: macOS-latest
-#            cache_path: ${{ env.python_cache_macOS_path }}
-#          - os: ubuntu-latest
-#            cache_path: ${{ env.python_cache_ubuntu_path }}
-        exclude:
+        #        include:
+        #          - os: windows-latest
+        #            cache_path: ${{ env.python_cache_windows_path }}
+        #          - os: macOS-latest
+        #            cache_path: ${{ env.python_cache_macOS_path }}
+        #          - os: ubuntu-latest
+        #            cache_path: ${{ env.python_cache_ubuntu_path }}
+        #FIXME run on every platform as on Linux when speed is equivalent
+        include:
           - os: macOS-latest
             multi-platform: false
-          - os: macOS-latest
-            python-version: 3.10
-          - os: macOS-latest
-            python-version: 3.8
-          - os: macOS-latest
-            python-version: 3.7
-          - os: windows-latest
-            multi-platform: false
+            python-version: 3.9
+#          - os: windows-latest
+#            multi-platform: false
+#            python-version: 3.9
+    #        exclude:
+    #          - os: macOS-latest
+    #            multi-platform: false
+    #          - os: windows-latest
+    #            multi-platform: false
 
     name: Build and test
     runs-on: ${{ matrix.os }}
@@ -181,31 +186,46 @@ jobs:
         uses: actions/setup-python@v2
         with:
           python-version: ${{ matrix.python-version }}
+      - name: Install python tools
+        # This code forces the system to install latest tools as the ones present on the CI system may be too old
+        # for the process to go through properly.
+        run: |
+          python -m pip install --upgrade pip wheel setuptools
+          python -m pip install --upgrade flake8 pytest
+      - if: ${{ startsWith(matrix.os, 'windows') }}
+        run: |
+          python -m pip install --upgrade pipenv
+          python -m pipenv -V
+        name: Install latest pipenv
+      - if: ${{ !startsWith(matrix.os, 'windows') }}
+        run: |
+          python -m pip install pipenv==${{ env.pipenv_version }}
+        name: Install a fixed version of pipenv [${{ env.pipenv_version }}]
       - name: Determine dependencies [OS:${{ matrix.os }}, Python:${{ matrix.python-version }}]
         # Note
         # The below code generates a pip requirements file from the pipenv development requirements (also obtaining the
         # normal dependencies from setup.py).
-        # This code also forces the system to install latest tools as the ones present on the CI system may be too old
-        # for the process to go through properly.
         run: |
-          python -m pip install --upgrade pip wheel setuptools
-          python -m pip install flake8 pipenv pytest
-          python -m pipenv lock --dev -r --pre > dev-requirements.txt
+          python -m pipenv lock --dev -r > dev-requirements.txt
       - if: ${{ startsWith(matrix.os, 'macOS') }}
         run: echo "CACHE_PATH=${{ env.python_cache_macOS_path }}" >> $GITHUB_ENV
       - if: ${{ startsWith(matrix.os, 'windows') }}
         run: echo "CACHE_PATH=${{ env.python_cache_windows_path }}" >> $GITHUB_ENV
       - if: ${{ startsWith(matrix.os, 'ubuntu') }}
         run: echo "CACHE_PATH=${{ env.python_cache_ubuntu_path }}" >> $GITHUB_ENV
+      - name: Cache path to load
+        run: |
+          echo "Path to dependency cache: [${{ env.CACHE_PATH }}]"
       - name: Load Python Dependencies from cache
+        if: ${{ ! startsWith(matrix.os, 'windows') }}
         uses: actions/cache@v2
         with:
           path: ${{ env.CACHE_PATH }}
           key:  ${{ matrix.os  }}-pip-${{ matrix.python-version }}-${{ hashFiles('**/dev-requirements.txt') }}
           restore-keys: |
             ${{ matrix.os  }}-pip-${{ matrix.python-version }}
-#        env:
-#          CACHE_PATH: ${{ matrix.cache_path }}
+      #        env:
+      #          CACHE_PATH: ${{ matrix.cache_path }}
       - name: Install dependencies
         # Note
         # As a virtual machine is already being used, pipenv
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 3a8324e..f270c12 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -1,7 +1,7 @@
 name: GitHub Release
 
 env:
-  go_version: "1.16"
+  pipenv_version: 2021.5.29  # FIXME upgrade pipenv when https://github.com/pypa/pipenv/issues/4430 is actually fixed
 
 on:
   workflow_dispatch:
@@ -23,15 +23,16 @@ jobs:
         # normal dependencies from setup.py).
         # This code also forces the system to install latest tools as the ones present on the CI system may be too old
         # for the process to go through properly.
+        # FIXME upgrade pipenv when https://github.com/pypa/pipenv/issues/4430 is actually fixed
         run: |
           python -m pip install --upgrade pip wheel setuptools
-          python -m pip install flake8 pipenv pytest
-          python -m pipenv lock --dev -r --pre > dev-requirements.txt
+          python -m pip install pipenv==${{ env.pipenv_version }}
+          python -m pipenv lock --dev -r > dev-requirements.txt
       - uses: FranzDiebold/github-env-vars-action@v2
       - name: Load Python Dependencies from cache
         uses: actions/cache@v2
         with:
-          path: ${{ env.python_cache_ubuntu_path }}
+          path: ~/.cache/pip
           key:  linux-pip-3-continuous-delivery-scripts
       - name: Install dependencies
         # Note