diff --git a/pyproject.toml b/pyproject.toml
index ad022e8fe18..d0b8e7090c9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -54,6 +54,7 @@ tests = [
     "pytest==7.4.2",
     "pytest-cov==4.1.0",
     "pytest-xdist==3.3.1",
+    "vtk==9.2.6",
     "pyvista==0.38.0; python_version <= '3.7'",
     "pyvista==0.42.2; python_version > '3.7'",
     "scikit-learn==1.3.0; python_version == '3.7'",
@@ -80,6 +81,7 @@ doc = [
     "osmnx",
     "pypandoc==1.11",
     "pytest-sphinx==0.5.0",
+    "vtk==9.2.6",
     "pyvista==0.42.2; python_version > '3.7'",
     "pyvista==0.38.0; python_version <= '3.7'",
     "recommonmark==0.7.1",
@@ -112,6 +114,7 @@ full = [
     "pandas==2.0.3; python_version == '3.8'",
     "pandas==2.1.1; python_version > '3.9'",
     "osmnx",
+    "vtk==9.2.6",
     "pyvista==0.42.2; python_version > '3.7'",
     "pyvista==0.38.0; python_version <= '3.7'",
     "SRTM.py",
@@ -131,6 +134,7 @@ all = [
     "pandas==2.0.3; python_version == '3.8'",
     "pandas==2.1.1; python_version > '3.9'",
     "osmnx",
+    "vtk==9.2.6",
     "pyvista==0.42.2; python_version > '3.7'",
     "pyvista==0.38.0; python_version <= '3.7'",
     "SRTM.py",
@@ -204,6 +208,6 @@ checks = [
 exclude = [
     '\.AEDTMessageManager.add_message$',  # bad SS05
     '\.Modeler3D\.create_choke$',  # bad RT05
-    '\._unittest\',  # missing docstring for tests
+    '\._unittest',  # missing docstring for tests
     'HistoryProps.',  # bad RT05 because of the base class named OrderedDict
 ]
\ No newline at end of file