Seven bugs remained outstanding to completing the hard fork, leading to a delay in the scheduled upgrade.

Cardano’s development lab, Input Output (IOG), did not push out June 20’s planned “Vasil” hard fork on the Cardano testnet citing technical bugs, the team said on Tuesday.

Vasil, a network upgrade that would increase scaling capabilities on Cardano, is now slated for a late June release on testnet. Hard forks refer to a network upgrade that sees blockchains validating and producing new blocks with predetermined new rules in favor of old ones.

“The IOG engineering team is extremely close to finalizing the core work, with just seven bugs still outstanding to complete the hard fork work, with none currently ranked as ‘severe,” developers said. “After some consideration, we have agreed NOT to send the hard fork update proposal to the testnet today to allow more time for testing,” they added.

Developers said the “few outstanding items” were needed to confirm everything was “working as expected” and that they would “need a few more days” for it. “This puts us behind schedule on our previously communicated target date of June 29 for a mainnet hard fork,” they said.

The final decision to hard fork the Cardano Testnet will be made in consultation with the ecosystem’s decentralized application (dApp) development community. Necessary criteria before pushing the upgrade live would include clearing any critical issues in testing, conducting benchmarking tests for the software, and informing the broader developer community to allow sufficient time to retest their dApps before the hard fork.

The delay did not cause any negative sentiment among investors, price data suggests. Cardano’s ADA tokens were up 5.6% in the past 24 hours, outperforming bitcoin’s 3.9% rise.

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