Hello,

There is not a major change when it comes subsequent years' editions of NCERT. The NCERT books are usually revised and updated periodically to update any changes or updates in the subject matter.

However, the changes are really very minor that you won't even realise that there were changes. If you have the 2021 edition then you can go for it instead of purchasing the newer edition as most of the overall and core information is same.

Hope this helps,

Thank you