cannot install in the environment of python 3.9

Dear Sirs or Madams, the installation to the environment of python 3.9 failed. I check your repository at 'https://pypi.tuna.tsinghua.edu.cn/simple/pkuseg/'. It seems that there are no python 3.9 relevant files there. do you have any plan to support python 3.9? I also saw that in other issues, you suggested the file relevant to python 3.9. I cannot find the file. Your reply is highly appreciated. Tony