diff --git a/pyproject.toml b/pyproject.toml
index e53bf95ab..1df3f1683 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -69,7 +69,6 @@ atari = ["ale-py", "autorom", "opencv-python", "shimmy"]
 box2d = ["box2d-py", "pygame", "swig"]
 classic_control = ["pygame"]
 mujoco = ["mujoco", "imageio"]
-mujoco-py = ["mujoco-py", "cython"]
 mujoco_py = ["mujoco-py", "cython"]
 pybullet = ["pybullet"]
 envpool = ["envpool"]