diff --git a/pyproject.toml b/pyproject.toml
index dbce7cd..4ed3d79 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -30,6 +30,7 @@ Homepage = "https://git.dominik-roth.eu/dodox/nucon"
 [project.optional-dependencies]
 dev = ["pytest"]
 rl = ["gymnasium", "numpy"]
+sim = ["torch", "flask"]
 model = ["torch", "numpy"]
 drake = ["Pillow"]