diff --git a/.github/workflows/macos_ci.yml b/.github/workflows/macos_ci.yml
index 85e0810..64bc984 100644
--- a/.github/workflows/macos_ci.yml
+++ b/.github/workflows/macos_ci.yml
@@ -33,14 +33,23 @@ jobs:
         uses: davidB/rust-cargo-make@v1
       - name: Install Dependencies
         run: |
-          # cargo make install_deps # doesn't work
-          brew install casacore/tap/casacore mwatelescope/tap/aoflagger
+          # cargo make install_deps
+          # doesn't work on macos, brew install ... says you need arch -arm64 brew ...
+          # but there's no way to distinguish between macos-13 and macos-14
+          # using uname -m or arch
+          # https://github.com/actions/runner-images/issues/9471#issuecomment-1992603303
+          for f in $(find /usr/local/bin -type l -print); do \
+            (readlink $f | grep -q -s "/Library") && echo Removing "$f" && rm -f "$f"; \
+          done
+          INSTALL="brew install"
+          [ "${{ matrix.os }}" == "macos-14" ] && INSTALL="arch -arm64 brew install"
+          $INSTALL mwatelescope/tap/aoflagger
+          echo "DYLD_FALLBACK_LIBRARY_PATH=$(brew --prefix)/lib/" >> $GITHUB_ENV
+          echo "AOFLAGGER_LIB=$(brew --prefix)/lib/" >> $GITHUB_ENV
+          echo "AOFLAGGER_INCLUDE_DIR=$(brew --prefix)/include/" >> $GITHUB_ENV
+          echo "PKG_CONFIG_PATH=$(brew --prefix)/lib/pkgconfig/" >> $GITHUB_ENV
       - name: Run tests
         run: |
           cargo make test_no_default
           cargo make test_no_flag
           cargo make test
-        env:
-          DYLD_FALLBACK_LIBRARY_PATH: /opt/homebrew/lib/
-          AOFLAGGER_LIB: /opt/homebrew/lib/
-          AOFLAGGER_INCLUDE_DIR: /opt/homebrew/include/
diff --git a/Makefile.toml b/Makefile.toml
index 1d87cd0..08a618c 100644
--- a/Makefile.toml
+++ b/Makefile.toml
@@ -124,7 +124,13 @@ dependencies = ["linux_install_aoflagger"]
 
 [tasks.mac_install_deps]
 script = """
-brew install casacore/tap/casacore mwatelescope/tap/aoflagger
+INSTALL="brew install"
+# in github actions runners:
+# - macos-13: uname -m => x86_64, arch => i386
+# - macos-14: uname -m => x86_64, arch => i386
+# but macos-14 should be arm64 ?
+# in that case, we want INSTALL="arch -arm64 $INSTALL" apparently?
+$INSTALL mwatelescope/tap/aoflagger
 """
 
 [tasks.install_deps]