diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index c7ab32ed..c5033506 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -477,7 +477,7 @@ jobs:
       - name: Setup Dependencies MacOS
         run: |
           # install dependencies using homebrew
-          brew install boost cmake curl node opus
+          brew install boost cmake curl node opus pkg-config
 
           # fix openssl header not found
           ln -sf /usr/local/opt/openssl/include/openssl /usr/local/include/openssl