diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index aa68a59..1b1a27c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1,24 +1,34 @@
 name: proj4rb
 
-on: [push, pull_request]
+on: [push, pull_request, workflow_dispatch]
 
 jobs:
-  proj_8:
+  test:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-22.04]
+        os: [ubuntu-22.04, macos-13, macos-14]
         ruby: [3.2, 3.3]
     runs-on: ${{matrix.os}}
     steps:
       - name: Checkout
         uses: actions/checkout@v4
-      - name: Install Proj
-        run: sudo apt-get install libproj22
+      - name: CPU architecture
+        run: uname -p
+      - name: Install Proj (Ubuntu)
+        if: startsWith(matrix.os, 'ubuntu')
+        run: |
+          sudo apt-get update
+          sudo apt-get install libproj22
+      - name: Install Proj (Mac)
+        if: startsWith(matrix.os, 'macos')
+        run: |
+          brew update
+          brew install proj
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{matrix.ruby}}
           bundler-cache: true
       - name: Test
-        run: bundle exec rake test
\ No newline at end of file
+        run: bundle exec rake test