Ethereum's London Hard Fork are a set of 5 Ethereum improvement proposals that aim to change the speed and incentivisation of Ethereum mining. Since Ethereum is regarded as an inflationary cryptocurrency, there is no limit on its count and miners are rewarded with fresh, new coins each time they validate a block. They are then compensated with transaction fees paid by users. However, per Ethereum's London Hard Fork proposal, once the update is rolled out, miners will not receive income from transaction fees, thereby reducing the supply of this cryptocurrency and giving it a much-required boost. This update aims to make transaction fees more predictable for investors using blockchain technology.