> ## Documentation Index
> Fetch the complete documentation index at: https://docs.optimism.io/llms.txt
> Use this file to discover all available pages before exploring further.

# kona-client Releases

> Release history for kona-client. Rust fault proof client binary.

**kona-client** is the bare-metal fault proof program that executes the OP Stack state transition on a MIPS prover. It is the primary fault proof program for OP Stack chains. See the [fault proof specs](https://specs.optimism.io/experimental/fault-proof/index.html).

<Update label="May 25, 2026" description="v1.5.2" tags={["Latest", "Stable"]}>
  ## Overview

  This is a patch release of kona-client. It bumps FPVM precompile oracle gas for Glamsterdam (EIP-7904), tightens the interop trace-extension boundary to match op-program, and surfaces malformed output-root preimages explicitly. It is required before Glamsterdam activates on L1; otherwise optional.

  [View full release on GitHub →](https://github.com/ethereum-optimism/optimism/releases/tag/kona-client/v1.5.2)
</Update>

<Update label="May 12, 2026" description="v1.5.1" tags={["Stable"]}>
  ## Overview

  > \[!IMPORTANT]
  > This release assumes MSRV >= 1.94. You may use [https://github.com/ethereum-optimism/optimism/releases/tag/kona-client%2Fv1.2.14](https://github.com/ethereum-optimism/optimism/releases/tag/kona-client%2Fv1.2.14) for users not supporting this rust version yet.

  > \[!CAUTION]
  > ⚠️ This release is a critical security fix and is a required update for users `kona-client`.

  This is a patch release of `kona-client` that includes important bug fixes for state trie handling of destroyed accounts.

  [View full release on GitHub →](https://github.com/ethereum-optimism/optimism/releases/tag/kona-client/v1.5.1)
</Update>

<Update label="May 12, 2026" description="v1.2.14" tags={["Stable"]}>
  ## Overview

  ⚠️ This release is a critical security fix and is a required update for users of `kona-client/v1.2.13`.

  This is a patch release of kona-client that includes important bug fixes for state trie handling of destroyed accounts.

  [View full release on GitHub →](https://github.com/ethereum-optimism/optimism/releases/tag/kona-client/v1.2.14)
</Update>