The American-owned outfit has remained an outlier in sticking to the in-wash solution that technical partner Ferrari has begun the new regulations rules era with.
But with Ferrari having ditched the in-wash solution at the Spanish Grand Prix, and Mercedes having abandoned its zero pods from Monaco, Haas was left alone as the only squad not running the downwash concept.
That will now change from next month's race in Austin, as a major upgrade is planned which will include an overhaul of its sidepods to adopt the downwash solution that Red Bull has put to good use.
The decision to change approach was made before the summer break and was prompted by the team feeling it had hit a performance ceiling with its current car.
Team principal Guenther Steiner said: "That was our biggest problem with the concept we have now, we couldn't find any performance any more.
"We developed the whole year and there was nothing there. At some stage, you need to do something different, and we could not keep on banging our heads against the wall trying, while the other ones kept on finding gains.
"McLaren changed the system like this, and they found something at some stage. So, at some point, you need to change concept, and you need to face reality."
Source: Autosport