diff --git a/packages/python/plotly/_plotly_utils/basevalidators.py b/packages/python/plotly/_plotly_utils/basevalidators.py
index 66e7b15dc85..677fcacbe76 100644
--- a/packages/python/plotly/_plotly_utils/basevalidators.py
+++ b/packages/python/plotly/_plotly_utils/basevalidators.py
@@ -1276,6 +1276,7 @@ class ColorValidator(BaseValidator):
         "teal",
         "thistle",
         "tomato",
+        "transparent",
         "turquoise",
         "violet",
         "wheat",