Upgrade priority: Medium (timely upgrade recommended) - due to change(s): Fix tx-pool returning the same transaction multiple times (paritytech/substrate#6535)
 
Specs of the runtime can be found here: https://github.com/paritytech/polkadot/releases

 Set the new runtime code.

 # <weight>
 - `O(C + S)` where `C` length of `code` and `S` complexity of `can_set_code`
 - 1 storage write (codec `O(C)`).
 - 1 call to `can_set_code`: `O(S)` (calls `sp_io::misc::runtime_version` which is expensive).
 - 1 event.
 The weight of this function is dependent on the runtime, but generally this is very expensive.
 We will treat this as a full block.
 # </weight>

- There is a problem with the tx-pool in Polkadot.
- It is returning the same transaction multiple times.
- This problem needs to be fixed.
- The upgrade to fix this problem is a medium priority.
- You can find more information about the upgrade on this website: https://github.com/paritytech/polkadot/releases.

#70 Kusama runtime upgrade