Hardhat upgrade failing with HH110 on matic testnet

I am deploying my contracts with a proxy pattern.

Deployment to matic testnet works correctly, but if I want to upgrade my contract it fails with:

HardhatError: HH110: Invalid JSON-RPC response received: {"error":{"details":"Internal RPC Error. Try again after some time..","code":-32005},"jsonrpc":"2.0","id":6}

my matic network config:
matic: {
url: "https://rpc-mumbai.maticvigil.com/",
accounts: [owner],

Can you try with a different RPC endpoint? We've been seeing some issues with the maticvigil provider on our end.

Thank you!

RPC: https://matic-mumbai.chainstacklabs.com

Did the trick. Successfully upgraded!.