diff --git a/doc/changelog.d/447.dependencies.md b/doc/changelog.d/447.dependencies.md
new file mode 100644
index 00000000..3f764c48
--- /dev/null
+++ b/doc/changelog.d/447.dependencies.md
@@ -0,0 +1 @@
+maint: bump vtk from 9.3.1 to 9.4.0
\ No newline at end of file
diff --git a/pyproject.toml b/pyproject.toml
index d95821fb..dfc9c941 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -42,7 +42,7 @@ tests = [
     "pytest-cov==6.0.0",
     "pytest-rerunfailures==15.0",
     "pyvista==0.44.2",
-    "vtk==9.3.1",
+    "vtk==9.4.0",
 ]
 doc = [
     "Sphinx==8.1.3",
@@ -63,7 +63,7 @@ doc = [
     "sphinx-notfound-page==1.0.4",
     "sphinx-gallery==0.18.0",
     "trame==3.7.0",
-    "vtk==9.3.1",
+    "vtk==9.4.0",
 ]
 
 [tool.flit.module]