diff --git a/pyproject.toml b/pyproject.toml
index 4f1ecced4..5c965ee34 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -47,7 +47,7 @@ tests = [
     "flake8-black",
     "flake8-pyproject",
     "pandas",
-    "numericalunits==1.25",
+    "numericalunits==1.28",
     "pylint",
     "isort"
 ]
diff --git a/requirements-tests.txt b/requirements-tests.txt
index b21f2b1fc..218301e65 100644
--- a/requirements-tests.txt
+++ b/requirements-tests.txt
@@ -1,6 +1,6 @@
 pytest
 pytest-coverage
 pandas
-numericalunits==1.25
+numericalunits==1.28
 pylint
 ruff>=0.9