diff --git a/pyproject.toml b/pyproject.toml
index d6cad3fe..effefc57 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -2,6 +2,6 @@
 requires = [
     "numpy>=2.0.0rc2,<3",
     "setuptools",
-    "vtk>=9",
+    "vtk>=9,<9.5",
     "wheel"
 ]