gym version confict with other package

[song-hl]

My PROBLEM is if multiagent_mujoco can work with higher version "gym",like 0.17.2 or 0.21.0(newest)

I want to create a marl environment that include some marl benchmark package. "mamujoco" need gym verison is "=0.10.8",which lead to following dependency conflicts after pip install.

• rl-games 1.5.2 requires gym>=0.17.2, but you have gym 0.10.8 which is incompatible.
• gfootball 2.10.2 requires gym>=0.11.0, but you have gym 0.10.8 which is incompatible.