diff --git a/requirements/requirements_docs.txt b/requirements/requirements_docs.txt
index 8bfa2d61d6..abf486f3bd 100644
--- a/requirements/requirements_docs.txt
+++ b/requirements/requirements_docs.txt
@@ -14,3 +14,4 @@ sphinx-notfound-page==1.0.4
 sphinx-reredirects==0.1.3
 sphinx_design==0.6.1
 sphinxcontrib-napoleon==0.7
+vtk==9.3.1
diff --git a/requirements/requirements_test.txt b/requirements/requirements_test.txt
index b6252a0153..4f39f36c34 100644
--- a/requirements/requirements_test.txt
+++ b/requirements/requirements_test.txt
@@ -7,3 +7,4 @@ pytest-cov==5.0.0
 pytest-order==1.3.0
 pytest-rerunfailures==15.0
 pyvista==0.44.1
+vtk==9.3.1