上手 with くなる

Japanese
#1

I’m currently studying new grammar and in N4 lesson for ～ていく they use this sentence

毎日ゴルフの練習をしたらだんだんと上手くなっていく。

Could someone explain to me why is there a く after 上手？ If I look it up it’s a な adjective so shouldn’t になる be used or is this an exception?

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#2

上手（うま）い is the reading and means pretty much the same as 上手（じょうず）

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#3

Oh wow, didn’t expect that at all, thank you for the help!

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