diff --git a/.github/workflows/linux-ci.yml b/.github/workflows/linux-ci.yml
index 8bc7458c5..24c70718b 100644
--- a/.github/workflows/linux-ci.yml
+++ b/.github/workflows/linux-ci.yml
@@ -23,17 +23,20 @@ jobs:
         flags: [ADD_CXXFLAGS=-fvisibility=hidden]
         download_requirements: [sudo apt install -y -qq gfortran liblapack-dev libmetis-dev libnauty2-dev]
         include:
-          - os: macos-12
+          - os: macos-13
+            arch: auto
             build_static: false
-            flags: CC=clang OSX=12
+            flags: CC=clang OSX=13
             download_requirements: brew install metis bash
-          - os: macos-12
+          - os: macos-13
+            arch: auto
             build_static: false
-            flags: CC=gcc-11 CXX=g++-11 OSX=12
+            flags: CC=gcc-13 CXX=g++-13 OSX=13
             download_requirements: brew install metis bash
-          - os: macos-12
+          - os: macos-13
+            arch: arm64
             build_static: false
-            flags: CC=gcc-12 CXX=g++-12 OSX=12
+            flags: CC=clang OSX=13
             download_requirements: brew install metis bash
     steps:
       - name: Checkout source
diff --git a/.github/workflows/windows-ci.yml b/.github/workflows/windows-ci.yml
index 882b266ec..74b1a1e86 100644
--- a/.github/workflows/windows-ci.yml
+++ b/.github/workflows/windows-ci.yml
@@ -107,7 +107,7 @@ jobs:
           ADD_BUILD_ARGS+=( --build=x86_64-w64-mingw32 --tests main --enable-relocatable )
           ADD_BUILD_ARGS+=( --verbosity 2 )
           [[ ${{ matrix.debug }} == "true" ]] && ADD_BUILD_ARGS+=( --enable-debug )
-          [[ ${{ matrix.arch }} == "msvc" ]] && ADD_BUILD_ARGS+=( --enable-msvc )
+          [[ ${{ matrix.arch }} == "msvc" ]] && ADD_BUILD_ARGS+=( --enable-msvc=MD )
           ./coinbrew/coinbrew fetch ${{ github.event.repository.name }} --skip-update "${ADD_ARGS[@]}"
           ./coinbrew/coinbrew build ${{ github.event.repository.name }} ${{ env.host_flag }} \
           "${ADD_ARGS[@]}" "${ADD_BUILD_ARGS[@]}"