diff --git a/src/ifcopenshell-python/pyproject.toml b/src/ifcopenshell-python/pyproject.toml
index 89a55a2c69..fc1bff6807 100644
--- a/src/ifcopenshell-python/pyproject.toml
+++ b/src/ifcopenshell-python/pyproject.toml
@@ -15,7 +15,7 @@ classifiers = [
     "Programming Language :: Python :: 3",
     "License :: OSI Approved :: GNU Lesser General Public License v3 or later (LGPLv3+)",
 ]
-dependencies = ["mathutils", "shapely", "numpy", "isodate", "dateutil", "lark"]
+dependencies = ["mathutils", "shapely", "numpy", "isodate", "python-dateutil", "lark"]
 
 [project.urls]
 "Homepage" = "http://ifcopenshell.org"