diff --git a/pyproject.toml b/pyproject.toml
index 554771a..ed11723 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -49,6 +49,8 @@ dev = [
     "playwright==1.50.0",
     "inline-snapshot>=0.20.7",
 ]
+
+[project.optional-dependencies]
 visualization = [
     "graphviz>=0.17",
 ]