Lewis Hamilton said he was "really happy" with the Mercedes upgrades package that improved his car and helped him finish fourth ahead of team-mate George Russell in Sunday's Monaco Grand Prix.
"I'm really happy - we've moved forwards," said the seven-time world champion.
"Coming into this weekend, I didn't know where we would stand so to take fourth and fifth is good points for the team - a huge thank you to everyone at the factory for the upgrades on our car."
Referring to the conditions in a challenging race in changing conditions, he added: "We kept it in one piece, we brought it home. We beat the Ferraris and we really got some great points as a team.
"And now we go to Barcelona which is the best circuit for us. It was difficult to know here - the car felt stiff, there are a lot of bumps and it's tricky, but I noticed one particular part of the car that was better, but I don't know how that will be next week.
"I'm pretty sure it will be a much better package."
Explaining his radio comments about the dangerous conditions during the race, he said the car felt very twitchy.
"The tyres weren't working so it was like racing on ice. Then after a time, the tyres started to work and it as fine, but I was so close to going off and crashing, having a big shunt. It was crazy."
Hamilton and Russell are fourth and fifth in the drivers' championship behind the Red Bull drivers Max Verstappen, who won Sunday's