diff --git a/pyproject.toml b/pyproject.toml
index 84e12a87..7e9171bb 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,5 +1,7 @@
 # See: https://cibuildwheel.readthedocs.io/en/stable/options/
 
 [tool.cibuildwheel]
-before-all = "python -m pip install cython psutil"
-before-build = "python build_tools/build.py"
+before-build = """
+pip install psutil cython
+python build_tools/build.py
+"""