Contracts should be deployed with the same compiler version and used during development and testing. Locking the pragma helps to ensure
that contracts do not accidentally get deployed using another pragma.
The issue is on line 2 of the MysteryBox contract.
An outdated pragma version might introduce bugs that affect the contract system negatively or recently released pragma versions may have unknown security vulnerabilities.
Manual Review
Consider locking the pragma in the contracts to the 0.8.0 version.
It is not recommended to use a floating pragma in production.
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