The system requirements for the Steam version are as follows:

MINIMUM:
OS: Windows 7 SP1 with Platform Update for Windows 7 (64-bit versions only)
Processor: Intel Core i5-2400 @ 3.1 GHz | AMD FX-6300 @ 3.5 GHz or better
Memory: 8 GB RAM
Graphics: NVIDIA GeForce GTX 760 (2GB VRAM or better) | AMD R9 270 (2GB VRAM or better)
DirectX: Version 11
Storage: 59 GB available space

RECOMMENDED:
OS: Windows 10 (64-bit versions only)
Processor: Intel Core i7-4770 @ 3.4 GHz | AMD Ryzen 5 1600 @ 3.2 GHz or equivalent
Memory: 16 GB RAM
Graphics: NVIDIA GeForce GTX 1070 (6GB VRAM or better) | AMD Vega 56 (6GB VRAM or better)
DirectX: Version 11
Storage: 59 GB available space