diff --git a/pyproject.toml b/pyproject.toml
index 1b02656ff9..eefd353155 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -113,6 +113,7 @@ full = [
     "osmnx",
     "pyvista==0.42.2; python_version > '3.7'",
     "pyvista==0.38.0; python_version <= '3.7'",
+    "vtk==9.2.6",
     "SRTM.py",
     "utm",
     "scikit-rf",