Mac Mini 2.0G HZz 2 DUO?

I have a older Mac Mini & was wondering if I can upgrade anything on it:

Model Name: Mac mini
Model Identifier: Macmini2,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 4 MB
Memory: 4 GB
Bus Speed: 667 MHz
Boot ROM Version: MM21.009A.B00
SMC Version (system): 1.19f0
Serial Number (system): G87332APYL2
Hardware UUID: 00000000-0000-1000-8000-0016CBAA4B6B
kindest regards
Zip

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