diff --git a/.github/workflows/master.yml b/.github/workflows/master.yml
index a846a87..14f19a3 100644
--- a/.github/workflows/master.yml
+++ b/.github/workflows/master.yml
@@ -22,7 +22,7 @@ jobs:
     strategy:
       matrix:
         # https://github.com/actions/runner-images
-        os: [ubuntu-latest, ubuntu-20.04, macos-latest, macos-13]
+        os: [ubuntu-latest, ubuntu-20.04, macos-latest, macos-13, macos-12]
 
     steps:
     - uses: actions/checkout@v3
@@ -52,6 +52,9 @@ jobs:
       if: ${{ startsWith(matrix.os, 'macos') }}
       run: brew install shadowsocks-libev v2ray-plugin
 
+    - name: Install PySocks
+      run: pip3 install PySocks
+
     - name: Test
       working-directory: ${{github.workspace}}/build
       # Execute tests defined by the CMake configuration.