diff --git a/CHANGELOG.md b/CHANGELOG.md
index 407ceae..d2af75a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,8 @@
 # ChangeLog
 
+## 3.6.2 - 2026-10-15
+- add numpy to pyproject.toml file ([#248](https://github.com/pni-libraries/python-pninexus/pull/258)
+
 ## 3.6.1 - 2026-10-15
 - add pyproject.toml file ([#247](https://github.com/pni-libraries/python-pninexus/pull/254)
 
diff --git a/pyproject.toml b/pyproject.toml
index 747b901..aaa819d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,5 +1,5 @@
 [build-system]
-requires = ["setuptools>=42", "wheel"]
+requires = ["setuptools>=42", "wheel", "numpy"]
 build-backend = "setuptools.build_meta"
 
 # [tool.ruff.lint]