| Class | Upgrade | |
| Level | Cost | Cost |
| 1 | 1000 cr | - |
| 2 | 4000 cr | 3000 cr |
| 3 | 9000 cr | 5000 cr |
| 4 | 16000 cr | 7000 cr |
| 5 | 25000 cr | 9000 cr |
| 6 | 36000 cr | 11000 cr |
| 7 | 49000 cr | 13000 cr |
| 8 | 64000 cr | 15000 cr |
| 9 | 81000 cr | 17000 cr |
| 10 | 100000 cr | 19000 cr |
| 11 | 121000 cr | 21000 cr |
| 12 | 144000 cr | 23000 cr |
| 13 | 169000 cr | 25000 cr |
| 14 | 196000 cr | 27000 cr |
| 15 | 225000 cr | 29000 cr |
| 16 | 256000 cr | 31000 cr |
| 17 | 289000 cr | 33000 cr |
| 18 | 324000 cr | 35000 cr |
| 19 | 361000 cr | 37000 cr |
| 20 | 400000 cr | 39000 cr |