diff --git a/packages/python/plotly/test_requirements/requirements_39_optional.txt b/packages/python/plotly/test_requirements/requirements_39_optional.txt
index 411c9c0f158..88ac10b61cf 100644
--- a/packages/python/plotly/test_requirements/requirements_39_optional.txt
+++ b/packages/python/plotly/test_requirements/requirements_39_optional.txt
@@ -19,3 +19,4 @@ matplotlib==2.2.3
 scikit-image==0.18.1
 psutil==5.7.0
 kaleido
+setuptools>=78.1.1 # not directly required, pinned by Snyk to avoid a vulnerability