diff --git a/.github/workflows/c-cpp.yml b/.github/workflows/c-cpp.yml
index 562f4bfc9..46ecaff38 100644
--- a/.github/workflows/c-cpp.yml
+++ b/.github/workflows/c-cpp.yml
@@ -66,6 +66,7 @@ jobs:
         brew install libtool
         brew install grep
         brew install lua
+        brew install swig
         brew install tcl-tk
     - name: bootstrap
       run: ./bootstrap