Investors held a higher percentage of ether and ether-linked products at the end of last week than at any time since May.
Buterin said the London hard fork paves the way for ethereum's transition to a proof-of-stake system, which would lower its carbon emissions by 99%.
The amount of ether being burned has gone up considerably and ether is being burnt at an epic rate since the upgrade launched.
Strong corporate earnings and a drop in weekly jobless claims pushed the S&P 500 to a new record high on Thursday.
A major change to the ethereum network will start to destroy ether coins, which could drive up the price.