diff --git a/.github/workflows/build-and-test-macos.yml b/.github/workflows/build-and-test-macos.yml
index 86e94d7c09..66f3418701 100644
--- a/.github/workflows/build-and-test-macos.yml
+++ b/.github/workflows/build-and-test-macos.yml
@@ -53,6 +53,10 @@ jobs:
         with:
           mpi: ${{ matrix.mpi }}
 
+      - name: Install pkg-config
+        run: |
+          brew install pkg-config
+
       - name: Install math libraries (OpenBLAS)
         if: matrix.math-libs == 'openblas'
         run: |
diff --git a/.github/workflows/style.yml b/.github/workflows/style.yml
index e67910acde..2776149ce4 100644
--- a/.github/workflows/style.yml
+++ b/.github/workflows/style.yml
@@ -16,12 +16,8 @@ jobs:
         with:
           version: '1'
 
-      # Install more recent clang-format from LLVM (match Homebrew v15)
       - name: Install clang-format
         run: |
-          wget -O- https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
-          sudo add-apt-repository 'deb http://apt.llvm.org/bullseye/ llvm-toolchain-bullseye-15 main'
-          sudo apt-get update -q
           sudo apt-get install -y clang-format-15
 
       - name: Check style