diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b8635072..c8f5a878 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -70,6 +70,9 @@ jobs:
 
     - name: Install graphviz
       uses: ts-graphviz/setup-graphviz@v2
+      with:
+        # Skip to run brew update command on macOS.
+        macos-skip-brew-update: 'true' # default false
 
     - name: Test interface ACT-R
       run: |