diff --git a/pyproject.toml b/pyproject.toml
index 415b451..ab9e389 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -28,7 +28,7 @@ dependencies = [
     "requests",
     "tables",
     "vedo>=2025.5.3",
-    "vtk"
+    "vtk<9.7.0"
 ]
 
 license = { text = "BSD-3-Clause" }