⭐What should i upgrade first? Cpu or Gpu?

Apr 14, 2018
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Hello Peaple :)
-I'm going to buy a i5 6500 and GTX 1060 3GB But for now i can only buy one ,
My Pc spec:
CPU : I3 6100 3,7GHZ
GPU : GTX 950 2GB
RAM: 8GB DDR4 2133

Which one should I buy first?, I5(180€) or 1060(250€)