diff --git a/.github/workflows/MacOS.yaml b/.github/workflows/MacOS.yaml
index f7870fb..16d3955 100644
--- a/.github/workflows/MacOS.yaml
+++ b/.github/workflows/MacOS.yaml
@@ -38,6 +38,7 @@ jobs:
       - name: Install system dependencies
         run: |
           brew tap coin-or-tools/coinor
+          brew trust coin-or-tools/coinor
           brew install coin-or-tools/coinor/symphony
 
       - uses: r-lib/actions/setup-r-dependencies@v2