diff --git a/src/ifcopenshell-python/Makefile b/src/ifcopenshell-python/Makefile
index 5233776e2c..cac50969b9 100644
--- a/src/ifcopenshell-python/Makefile
+++ b/src/ifcopenshell-python/Makefile
@@ -27,6 +27,7 @@ SED:=sed -i '' -e
 endif
 endif
 
+# TODO: we should simplify this at some point...
 ifeq ($(PYVERSION), py39)
 PYNUMBER:=39
 endif
@@ -39,6 +40,12 @@ endif
 ifeq ($(PYVERSION), py312)
 PYNUMBER:=312
 endif
+ifeq ($(PYVERSION), py313)
+PYNUMBER:=313
+endif
+ifndef PYNUMBER
+$(error Unsupported PYVERSION '$(PYVERSION)')
+endif
 
 # We actually do support glibc 2.28-2.30 (see #5636)
 # but those are old and there's no demand for it.
diff --git a/src/ifcopenshell-python/pyproject.toml b/src/ifcopenshell-python/pyproject.toml
index 26a0f9f450..652b1fcdab 100644
--- a/src/ifcopenshell-python/pyproject.toml
+++ b/src/ifcopenshell-python/pyproject.toml
@@ -10,7 +10,7 @@ authors = [
 ]
 description = "Python bindings, utility functions, and high-level API for IfcOpenShell"
 readme = "README.md"
-requires-python = ">=3.9,<3.13"
+requires-python = ">=3.9,<3.14"
 classifiers = [
     "Programming Language :: Python :: 3",
     "License :: OSI Approved :: GNU Lesser General Public License v3 or later (LGPLv3+)",