[Update]

From what I have read, all servers are updated on Minehut's side

to play until your server is updated, you can change your client like this:

1) Open your Minecraft Client and log in
2) Under the Minecraft logo, click on ‘Installations’
3) Click ’+New”
4) Under Version, click the carrot and select the version you’d like to use. (We recommend 1.15.1)
5) Name your configuration under Name
6) Click ‘Save’
7) Click on the Minecraft logo
Find the green ‘PLAY’ button and select the carrot next to it
9) Find your new configuration and click on it
10) Click ‘PLAY’

[Updating server]

From what I have read, all servers are updated on Minehut's side

to play until your server is updated, you can change your client like this:

1) Open your Minecraft Client and log in
2) Under the Minecraft logo, click on ‘Installations’
3) Click ’+New”
4) Under Version, click the carrot and select the version you’d like to use. (We recommend 1.15.1)
5) Name your configuration under Name
6) Click ‘Save’
7) Click on the Minecraft logo
Find the green ‘PLAY’ button and select the carrot next to it
9) Find your new configuration and click on it
10) Click ‘PLAY’