compile error

[zivyuan]

I've downloaded the latest version of contract. Error reported when compile:
`

Compiling ./contracts/Date.sol
Compiling ./contracts/Migrations.sol

project:/contracts/Date.sol:40:47: ParserError: Expected '{' but got reserved keyword 'override'
function _baseURI() internal view virtual override returns (string memory) {
^------^

Compilation failed. See above.
Truffle v5.4.24 (core: 5.4.24)
Node v16.13.1
`
how to solve this problem?