diff --git a/pyproject.toml b/pyproject.toml
index 9b12d6bb7..96a5f1f40 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -69,7 +69,7 @@ tooling = [ # in local development these are provided globally
 ]
 tests = [ "rmi-etoolbox[dev,tooling]" ]
 optional = [
-    "plotly>5.10,<6.3",
+    "plotly>5.10,<6.4",
     "sqlalchemy>1.4,<2.1",
 ]
 pudl-test = []