Following the discovery of a security issue submitted through Moonbeam's Immunefi bug bounty program, the Moonbeam Council proposes to upgrade the Moonbeam's runtime to **version 1503**.

### Runtime 1503 release note :
[https://github.com/PureStake/moonbeam/releases/tag/runtime-1503](https://github.com/PureStake/moonbeam/releases/tag/runtime-1503)  


The fix aims to quickly disabled all DELEGATECALL to prevent the vulnerability from being exploited.

### Important note : 
Transactions to smart contracts relying on DELEGATECALL will fail and be marked as reverted.

More information on the security issue can be found in the following announcement : 
[https://moonbeam.network/blog/urgent-security-patch-for-custom-precompiles/](https://moonbeam.network/blog/urgent-security-patch-for-custom-precompiles/)  

To learn more about Moonbeams bug bounties, visit the link below.
Immunefi Bug Bounty Program:
[https://immunefi.com/bounty/moonbeamnetwork/](https://immunefi.com/bounty/moonbeamnetwork/)   

###  Verification
Blake2_256 Hash: `0xafa29c905c6868077b9ce3b0ede9e2bd773bb1389bf2a5a14f665efc2e3399f8`  
If you want to apply the best practices and verify the hash of the proposal, we advise you to use srtool

- Moonbeam Council wants to upgrade Moonbeam's runtime to version 1503.
- The upgrade will fix a security issue and disable DELEGATECALL.
- Transactions to smart contracts relying on DELEGATECALL will fail.
- More information about the security issue can be found in the announcement.
- Moonbeam has a bug bounty program called Immunefi.

#95 Runtime Upgrade 1503 - Moonriver Network