diff --git a/pyproject.toml b/pyproject.toml
index 2c1f50e4..2a379ab5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -45,6 +45,7 @@ find = { include = ["chgnet*"], exclude = ["tests", "tests*"] }
 
 [tool.setuptools.package-data]
 "chgnet" = ["*.json", "py.typed"]
+"chgnet.graph.fast_converter_libraries" = ["*"]
 "chgnet.pretrained" = ["*", "**/*"]
 
 [build-system]