(Bloomberg) -- Bitcoin and Ether reached their highest levels in more than two months after a major Ethereum upgrade and even in the face of uncertainty over crypto rules in the U.S. infrastructure plan.

Bitcoin gained as much as 3.1% to $45,328 on Sunday, its highest level since May 18. Ether increased as much as 3.5% to $3,191, gaining for a fifth day amid the Ethereum network’s London upgrade, which reduces the pace of growth in the coins.

“A mood of optimism appears to have returned to cryptocurrency markets,” Paolo Ardoino, chief technology officer at Bitfinex, said in comments Friday. “Bitcoin is leading the charge while Ethereum continues to make