diff --git a/pyproject.toml b/pyproject.toml
index c7e52bed..8e4f2c74 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -97,6 +97,7 @@ markers = [
     "image: plotter rendering image test",
 ]
 minversion = "6.0"
+required_plugins = "pytest-mock pytest_pyvista"
 testpaths = "tests"