diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index febbc7b..7971de7 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -16,6 +16,13 @@ jobs:
         uses: actions/checkout@v4
         with:
           submodules: true
+      - name: Install dependencies on macos
+        if: matrix.os == 'macos-latest'
+        run: brew install gdal proj
+      - name: Set PROJ_DATA
+        if: matrix.os == 'macos-latest'
+        run: |
+          echo "PROJ_DATA=$(brew --prefix proj)/share/proj" >> "$GITHUB_ENV"
       - name: Set up R
         uses: r-lib/actions/setup-r@v2
         with: