Tezos Babylon Upgrade: Explained
The Tezos Babylon upgrade was one of the network’s earliest major protocol changes. Activated in October 2019, it updated consensus, delegation, smart contract behavior, and parts of Tezos governance.
Babylon also became an important proof point for Tezos’ self-amending design. Instead of relying on a traditional hard fork, the upgrade was proposed, voted on, and activated through the network’s on-chain governance process.
What Was the Tezos Babylon Upgrade?
Babylon was a protocol upgrade developed by teams including Nomadic Labs and Cryptium Labs and activated automatically after approval by the Tezos community.
It introduced the Emmy+ consensus update, simplified delegation, changed how certain accounts worked, and improved parts of the Michelson smart contract system. The upgrade was designed to make Tezos easier to use while showing that the protocol could evolve through coordinated on-chain amendments.
What Did Babylon Change?
Babylon introduced several important protocol changes:
- Consensus: Emmy+ adjusted baking and endorsement mechanics.
- Delegation: tz1, tz2, and tz3 accounts could delegate directly without creating separate KT1 delegation accounts.
- Smart contracts: updates improved Michelson and contract behavior.
- Governance: the amendment process was refined to make future protocol upgrades easier to coordinate.
Why Babylon Mattered for Tezos
Babylon showed that Tezos could make substantial protocol changes through its built-in governance system rather than relying on a traditional hard fork.
That became one of the upgrade’s main legacies. Tezos continued using the same self-amending model for later protocol changes, making Babylon an early demonstration of how the network was designed to evolve over time.
Tezos After Babylon
Babylon was only one step in Tezos’ longer upgrade history. The network continued to introduce new protocol amendments covering scalability, consensus, smart contracts, and performance.
By 2026, Tezos had moved through many additional upgrades, making Babylon primarily a historical milestone in the network’s evolution.
