diff --git a/pyproject.toml b/pyproject.toml
index dec1a3975..982350209 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -102,7 +102,7 @@ write_to = "src/PyPop/_version.py"  # matches the path where version will be wri
 build-backend = "setuptools.build_meta:__legacy__"
 requires = ["setuptools>=42",
 	    "setuptools_scm[toml]>=6.2",
-	    "cffconvert",
+	    "cffconvert @ git+https://github.com/alexlancaster/cffconvert.git@combine_features#egg=cffconvert",
 	    "importlib-metadata; python_version <= '3.8'"
 	    ]