diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 39b986d..65448a5 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -325,7 +325,8 @@ jobs:
           CIBW_ARCHS_LINUX: auto aarch64  # not used I believe
           CIBW_ARCHS_MACOS: x86_64 arm64
           CIBW_ENVIRONMENT: __O3_OPTIM=1
-          CIBW_BEFORE_BUILD: make clean && make  # and not CIBW_BEFORE_ALL !
+          CIBW_BEFORE_ALL: python -m pip install --upgrade setuptools wheel pybind11
+          CIBW_BEFORE_BUILD: CC=clang CXX=clang++ make clean && CC=clang CXX=clang++ make  # and not CIBW_BEFORE_ALL !
           CIBW_TEST_REQUIRES: grid2op pandapower
           CIBW_TEST_SKIP: "*-macosx_arm64"  # to silence warning "While arm64 wheels can be built on x86_64, they cannot be tested."
           CIBW_TEST_COMMAND: >