diff --git a/.github/workflows/bootstrap.yml b/.github/workflows/bootstrap.yml
index ec7d9a3898..1208d8e3b1 100644
--- a/.github/workflows/bootstrap.yml
+++ b/.github/workflows/bootstrap.yml
@@ -158,7 +158,7 @@ jobs:
         run: |
           brew install tree
       - uses: actions/checkout@ec3a7ce113134d7a93b817d10a8272cb61118579 # @v2
-      - uses: actions/setup-python@dc73133d4da04e56a135ae2246682783cc7c7cb6 # @v2
+      - uses: actions/setup-python@f38219332975fe8f9c04cca981d674bf22aea1d3 # @v2
         with:
           python-version: ${{ matrix.python-version }}
       - name: Bootstrap clingo
@@ -175,7 +175,7 @@ jobs:
         python-version: ['2.7', '3.5', '3.6', '3.7', '3.8', '3.9']
     steps:
       - uses: actions/checkout@ec3a7ce113134d7a93b817d10a8272cb61118579 # @v2
-      - uses: actions/setup-python@dc73133d4da04e56a135ae2246682783cc7c7cb6 # @v2
+      - uses: actions/setup-python@f38219332975fe8f9c04cca981d674bf22aea1d3 # @v2
         with:
           python-version: ${{ matrix.python-version }}
       - name: Setup repo and non-root user
diff --git a/.github/workflows/install_spack.sh b/.github/workflows/install_spack.sh
index bc1c5f43ec..be8ec8af21 100755
--- a/.github/workflows/install_spack.sh
+++ b/.github/workflows/install_spack.sh
@@ -2,19 +2,7 @@
 . share/spack/setup-env.sh
 echo -e "config:\n  build_jobs: 2" > etc/spack/config.yaml
 spack config add "packages:all:target:[x86_64]"
-# TODO: remove this explicit setting once apple-clang detection is fixed
-cat <<EOF > etc/spack/compilers.yaml
-compilers:
-- compiler:
-    spec: apple-clang@11.0.3
-    paths:
-      cc: /usr/bin/clang
-      cxx: /usr/bin/clang++
-      f77: /usr/local/bin/gfortran-9
-      fc: /usr/local/bin/gfortran-9
-    modules: []
-    operating_system: catalina
-    target: x86_64
-EOF
+spack compiler find
 spack compiler info apple-clang
 spack debug report
+spack solve zlib
diff --git a/.github/workflows/macos_python.yml b/.github/workflows/macos_python.yml
index c3ff5957b5..c1e77a7f24 100644
--- a/.github/workflows/macos_python.yml
+++ b/.github/workflows/macos_python.yml
@@ -25,7 +25,7 @@ jobs:
     runs-on: macos-latest
     steps:
     - uses: actions/checkout@ec3a7ce113134d7a93b817d10a8272cb61118579 # @v2
-    - uses: actions/setup-python@dc73133d4da04e56a135ae2246682783cc7c7cb6 # @v2
+    - uses: actions/setup-python@f38219332975fe8f9c04cca981d674bf22aea1d3 # @v2
       with:
         python-version: 3.9
     - name: spack install
@@ -40,7 +40,7 @@ jobs:
     timeout-minutes: 700
     steps:
     - uses: actions/checkout@ec3a7ce113134d7a93b817d10a8272cb61118579 # @v2
-    - uses: actions/setup-python@dc73133d4da04e56a135ae2246682783cc7c7cb6 # @v2
+    - uses: actions/setup-python@f38219332975fe8f9c04cca981d674bf22aea1d3 # @v2
       with:
         python-version: 3.9
     - name: spack install
@@ -53,7 +53,7 @@ jobs:
     runs-on: macos-latest
     steps:
     - uses: actions/checkout@ec3a7ce113134d7a93b817d10a8272cb61118579 # @v2
-    - uses: actions/setup-python@dc73133d4da04e56a135ae2246682783cc7c7cb6 # @v2
+    - uses: actions/setup-python@f38219332975fe8f9c04cca981d674bf22aea1d3 # @v2
       with:
         python-version: 3.9
     - name: spack install
diff --git a/.github/workflows/unit_tests.yaml b/.github/workflows/unit_tests.yaml
index 2f36957f7d..5935a81dd1 100644
--- a/.github/workflows/unit_tests.yaml
+++ b/.github/workflows/unit_tests.yaml
@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@ec3a7ce113134d7a93b817d10a8272cb61118579 # @v2
-    - uses: actions/setup-python@dc73133d4da04e56a135ae2246682783cc7c7cb6 # @v2
+    - uses: actions/setup-python@f38219332975fe8f9c04cca981d674bf22aea1d3 # @v2
       with:
         python-version: 3.9
     - name: Install Python Packages
@@ -34,7 +34,7 @@ jobs:
     - uses: actions/checkout@ec3a7ce113134d7a93b817d10a8272cb61118579 # @v2
       with:
         fetch-depth: 0
-    - uses: actions/setup-python@dc73133d4da04e56a135ae2246682783cc7c7cb6 # @v2
+    - uses: actions/setup-python@f38219332975fe8f9c04cca981d674bf22aea1d3 # @v2
       with:
         python-version: 3.9
     - name: Install Python packages
@@ -109,7 +109,7 @@ jobs:
     - uses: actions/checkout@ec3a7ce113134d7a93b817d10a8272cb61118579 # @v2
       with:
         fetch-depth: 0
-    - uses: actions/setup-python@dc73133d4da04e56a135ae2246682783cc7c7cb6 # @v2
+    - uses: actions/setup-python@f38219332975fe8f9c04cca981d674bf22aea1d3 # @v2
       with:
         python-version: ${{ matrix.python-version }}
     - name: Install System packages
@@ -170,7 +170,7 @@ jobs:
     - uses: actions/checkout@ec3a7ce113134d7a93b817d10a8272cb61118579 # @v2
       with:
         fetch-depth: 0
-    - uses: actions/setup-python@dc73133d4da04e56a135ae2246682783cc7c7cb6 # @v2
+    - uses: actions/setup-python@f38219332975fe8f9c04cca981d674bf22aea1d3 # @v2
       with:
         python-version: 3.9
     - name: Install System packages
@@ -236,7 +236,7 @@ jobs:
     - uses: actions/checkout@ec3a7ce113134d7a93b817d10a8272cb61118579 # @v2
       with:
         fetch-depth: 0
-    - uses: actions/setup-python@dc73133d4da04e56a135ae2246682783cc7c7cb6 # @v2
+    - uses: actions/setup-python@f38219332975fe8f9c04cca981d674bf22aea1d3 # @v2
       with:
         python-version: 3.9
     - name: Install System packages
@@ -285,7 +285,7 @@ jobs:
     - uses: actions/checkout@ec3a7ce113134d7a93b817d10a8272cb61118579 # @v2
       with:
         fetch-depth: 0
-    - uses: actions/setup-python@dc73133d4da04e56a135ae2246682783cc7c7cb6 # @v2
+    - uses: actions/setup-python@f38219332975fe8f9c04cca981d674bf22aea1d3 # @v2
       with:
         python-version: ${{ matrix.python-version }}
     - name: Install Python packages
@@ -328,7 +328,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@ec3a7ce113134d7a93b817d10a8272cb61118579 # @v2
-    - uses: actions/setup-python@dc73133d4da04e56a135ae2246682783cc7c7cb6 # @v2
+    - uses: actions/setup-python@f38219332975fe8f9c04cca981d674bf22aea1d3 # @v2
       with:
         python-version: 3.9
     - name: Install Python packages