diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index cac0c0e..5a299b8 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,12 +12,12 @@ on:
 jobs:
 
   macOS:
-    runs-on: macos-12
-
     strategy:
       matrix:
         node-version: [18, 20]
-        platform: [macos-13, macos-13-xlarge]
+        platform: [macos-12, macos-13-xlarge]
+
+    runs-on: ${{ matrix.os }}
 
     steps:
     - uses: actions/checkout@v3
diff --git a/download-libzim.js b/download-libzim.js
index d8efa19..ffa0528 100644
--- a/download-libzim.js
+++ b/download-libzim.js
@@ -8,9 +8,11 @@ const urlParser = require("url");
 
 mkdirp.sync("./download");
 
+console.info(`os.type() is '%s' and os.arch() gives '%s'`, os.type(), os.arch());
 const isMacOS = os.type() === "Darwin";
 const isLinux = os.type() === "Linux";
 const rawArch = os.arch();
+
 const isAvailableArch =
   rawArch === "x64" || rawArch === "arm" || rawArch === "arm64";