Error: self signed certificate in certificate chain

[arevaloignacio]

I have a couple of projects running the tests in SauceLabs. They were working correctly for a long time, but from 04/29/2021 they start failing with the error:

Sauce Cypress Runner 5.9.1
Preparing npm environment

Installing packages: cypress-keycloak-commands@1.2.0
FetchError: request to https://registry.npmjs.org/cypress-keycloak-commands failed, reason: self signed certificate in certificate chain
at ClientRequest. (D:\sauce-cypress-runner\5.9.1\bundle\node_modules\npm\node_modules\node-fetch-npm\src\index.js:68:14)
at ClientRequest.emit (events.js:315:20)
at ClientRequest.EventEmitter.emit (domain.js:467:12)
at TLSSocket.socketErrorListener (_http_client.js:469:9)
at TLSSocket.emit (events.js:315:20)
at TLSSocket.EventEmitter.emit (domain.js:467:12)
at emitErrorNT (internal/streams/destroy.js:106:8)
at emitErrorCloseNT (internal/streams/destroy.js:74:3)
at processTicksAndRejections (internal/process/task_queues.js:80:21) {
type: 'system',
errno: 'SELF_SIGNED_CERT_IN_CHAIN',
code: 'SELF_SIGNED_CERT_IN_CHAIN'
}

Any idea what could be the problem?