This is a referendum to upgrade Polkadot Relay Chain and Polkadot System Chains to the [1.7.1 Runtimes release](https://github.com/polkadot-fellows/runtimes/releases/tag/v1.7.1).

The highlights of the 1.7.1 (and included 1.7.0) release are:

* &#x20; Integrating "[Empowered XCM Origins](https://github.com/polkadot-fellows/runtimes/pull/799)" features to System Chains,
* &#x20; Adding [Snowbridge V2 pallets](https://github.com/polkadot-fellows/runtimes/pull/796), to enable Snowbridge V2 bridging,
* &#x20; Upgrading to the latest Polkadot-SDK (2507) that comes with many fixes and enhancements.



For the full list of changes, please read the fellowship [1.7.0 release notes](https://github.com/polkadot-fellows/runtimes/releases/tag/v1.7.0) and [1.7.1 release notes](https://github.com/polkadot-fellows/runtimes/releases/tag/v1.7.1).

If approved, it is scheduled to enact at block 27994000, estimated time 2025-09-30 10:42:01 (UTC).



Whitelist: [https://collectives.subsquare.io/fellowship/referenda/402](https://collectives.subsquare.io/fellowship/referenda/402)



🚨 Important note for Ecosystem builders: 🚨

In preparation for the upcoming Asset Hub Migration we changed the behavior of transfer\_assets and (limited\_)reserve\_transfer\_assets extrinsics to remove DOT/KSM support. You can find more information about what is changing, which SDK versions are affected, along with instructions on how to follow up in this [guide](https://forum.polkadot.network/t/mandatory-action-guide-for-ahm-broken-native-crosschain-transfers/14634).

We recommend that Parachains and dapp builders switch to using alternative extrinsics as instructed in the guide above, otherwise cross-chain transfers may start failing.

#1756 [Whitelisted Caller] Upgrade Polkadot RC and system chains to 1.7.1