## Runtime Upgrade 1.9.1

Upgrades the Kusama Relay Chain and System Parachains to [v1.9.1](https://github.com/polkadot-fellows/runtimes/releases/tag/v1.9.1). This replaces ref [#600](https://kusama.subsquare.io/referenda/600).  
See the testing and reproduction document [here](https://hackmd.io/v1dW-WHaR4Wj3ItH3j9LWA) on how the exact calls were constructed .

This is a preparation for the Asset Hub Migration (see [FAQ](https://docs.google.com/document/d/1XR3vL2p4QV0wC7FrlC8eN-q62BqNFTFElbj21wEmMGg/edit?tab=t.0#heading=h.vxykbd6ai7n7)). The migration is not immediately activated after the upgrade but rather schedules itself.

## Invulnerable Change For Asset Hub

We have added three more invulnerables from the set of permissionless collators in the protocol to improve the censorship resistance of Asset Hub post-AHM. Now that governance, staking and more other functionality is moving to AH this is needed more than ever.
The numbers have been decided in collaboration with W3F researchers, and the specific collators who are put forward are those who have proven themselves and are "up next" according to the System Parachain collator bounty.

## Timeline

### Block 30,406,134 (ca 6th Oct, 8 AM UTC)

The referenda passes and upgrades the runtimes. This should be handled like any normal runtime upgrade.

### Block 30,423,691 (ca 7th Oct, 11:59 AM UTC)

The Asset Hub migration starts and finishes within the next 6 hrs.

Here's a simple summary of the upgrade:

* Kusama network is getting an update
* This prepares for moving important functions to Asset Hub
* Three more trusted validators are being added
* This helps keep the network secure
* The upgrade happens first
* The big migration starts about a day later
* The migration takes about 6 hours to complete
* Everything should work normally during these changes

call

Deciding

Submitted

DecisionStarted

DecisionDepositPlaced

whitelisted_caller

Runtime Upgrade 1.9.1 and Invulnerable Set Extension

candidates

members

proficients

fellows

senior_fellows

experts

senior_experts

masters

senior_masters

grand_masters

root

wish_for_change

staking_admin

treasurer

lease_admin

fellowship_admin

general_admin

auction_admin

referendum_canceller

referendum_killer

small_tipper

big_tipper

small_spender

medium_spender

big_spender

Origin for signaling that the network wishes for some change

Able to spend up to 333,333.3333 KSM from the treasury at once

Managing the composition of the fellowship

Able to spend up to 8.3333 KSM from the treasury at once

Able to spend up to 33.3333 KSM from the treasury at once

Able to spend up to 333.3333 KSM from the treasury at once

Able to spend up to 3,333.3333 KSM from the treasury at once

Able to spend up to 33,333.3333 KSM from the treasury at once