diff --git a/pyproject.toml b/pyproject.toml
index 876551d..b3910d1 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -34,7 +34,7 @@ Repository = "https://github.com/openai/openai-agents-python"
 
 [project.optional-dependencies]
 voice = ["numpy>=2.2.0, <3; python_version>='3.10'", "websockets>=15.0, <16"]
-visualization = ["graphviz>=0.17"]
+viz = ["graphviz>=0.17"]
 
 [dependency-groups]
 dev = [