на новую

to a new one

→ на
phrase Uncommon #13,100
to a new one Used with a feminine noun understood from context, often after verbs such as заменить or перейти: на новую клавиатуру means “to a new keyboard.” Related forms include на новой, meaning “on a new one” or “at a new one,” depending on context.
RU: Мне нужно перейти на новую работу.
EN: I need to move to a new job.

Я села на новую диету.

I started a new diet.

Он заменил старую мышку на новую.

He replaced the old mouse with a new one.