While acknowledging that Aston is bringing updates on a regular basis, the Spaniard cited recent major changes from Ferrari, Mercedes and Red Bull as a warning that his team had to keep pace.
Aston has brought further updates in Barcelona this weekend after holding back some elements that were originally due to be seen at the cancelled Imola race, but which it opted not to fit to the car in Monaco.
“Yeah, we have some new parts,” said Alonso when asked by Autosport about this weekend’s changes. “I'm not sure exactly what, you will see it on the documents that the FIA is releasing.
“I think front wing, there is some modification there. And we're bringing always new parts to the car. Some of them are just circuit specific. Sometimes it's just an improvement in lap time.
“So yeah, I'm happy with how we are approaching every race, there is always something new on our car. We are trying to keep up the pace with the top teams.
“We're still growing in that area of the team. We found ourselves in a very competitive place this year that we didn't expect.
“We still need to speed up things. I think Ferrari is already two floors into this season, Mercedes was obviously a completely new car in Monaco and [the team has] more upgrades here. Red Bull, [had a] Baku package and another one here.
Source: Autosport