diff --git a/pyproject.toml b/pyproject.toml
index 8871d07..c2935bb 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -59,7 +59,7 @@ exclude = [
   "py_template/__init__.py",
   "test/__init__.py",
 ]
-explicit_package_bases = True
+explicit_package_bases = "True"
 
 [tool.coverage.run]
 omit = [