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op-challenger is a modular dispute game agent that monitors and challenges invalid fault proof games on-chain. See the fault proof specs.
May 26, 2026
LatestStable
v1.9.3

Overview

This is release of op-challenger is required for Upgrade 19. It contains bug fixes, new features, and the removal of deprecated functionality.Note: ZK dispute games and super dispute games (interop) are not yet live in production. Changes to those code paths in this release are preparation for future functionality and do not affect operators today.View full release on GitHub →
April 15, 2026
Stable
v1.9.1

Overview

This is a patch release of op-challenger that includes important security fixes for chains running permissionless fault proofs, along with other bug fixes. It is a required upgrade for all users.View full release on GitHub →
January 21, 2026
Stable
v1.9.0

Overview

This is a minor release of op-challenger that includes important bug fixes. It is a required upgrade for all users.View full release on GitHub →
January 9, 2026
Stable
v1.8.0

Overview

This release of op-challenger includes support for Upgrade 18, plus minor bug fixes and improvements. It is a required upgrade for all users.View full release on GitHub →
November 6, 2025
Stable
v1.7.0

Overview

This is a minor release of op-challenger, it’s an optional upgrade preparing for for an upcoming refactor of the dispute game contracts to be reusable across chainsView full release on GitHub →
October 7, 2025
Stable
v1.6.0

Overview

This release of op-challenger adds support for the Ethereum Fusaka upgrade. It’s a required upgrade.View full release on GitHub →
June 12, 2025
Stable
v1.5.1

Overview

This is a minor release of op-challenger that includes important bug fixes. It is a required upgrade for all users.View full release on GitHub →
June 4, 2025
Stable
v1.5.0

Overview

This release of op-challenger adds support for a new version of Cannon that is compatible with Go 1.23. It is a required upgrade for all users.View full release on GitHub →
April 15, 2025
Stable
v1.4.0

Overview

This release of op-challenger fixes a medium severity bug related to EIP-4844 blob data handling. It is a required upgrade for all users.View full release on GitHub →
March 20, 2025
Stable
v1.3.3

Overview

This is a minor release of op-challenger that includes a fix to improve stability. It is an optional upgrade.View full release on GitHub →
March 3, 2025
Stable
v1.3.2

Overview

This is a minor release of op-challenger that includes important bug fixes. It is a required upgrade for all users.View full release on GitHub →
February 12, 2025
Stable
v1.3.1

Overview

This is a minor release of op-challenger includes support for the Pectra hard fork on L1. It is a required upgrade for all users prior to Pectra activating on the L1 chain.View full release on GitHub →
December 9, 2024
Stable
v1.3.0

Overview

This is a minor release of op-challenger that includes minor new features and bug fixes. It is an optional upgrade for all users.View full release on GitHub →
November 5, 2024
Stable
v1.2.0

Overview

This is a minor release of op-challenger that includes minor new features and bug fixes. It is an optional upgrade for all users.View full release on GitHub →
September 26, 2024
Stable
v1.1.2

Overview

This is a minor release of op-challenger with minor new features. It is an optional upgrade for all users.View full release on GitHub →
September 11, 2024
Stable
v1.1.0

Overview

This is a minor release of op-challenger that includes support for the Granite hard fork changes and bug fixes. It is a required upgrade for all users.View full release on GitHub →
June 15, 2024
Stable
v1.0.1

Overview

This is a minor release of op-challenger that includes minor new features. It is an optional upgrade for all users.View full release on GitHub →
June 10, 2024
Stable
v1.0.0

Overview

This is the 1.0 release of op-challenger, an implementation of the honest actor algorithm for fault dispute games. To learn more about dispute games, visit the fault proof specs.🚢 Docker Image:View full release on GitHub →