---
title: Qiskit SDK changelog
description: The latest updates from Qiskit SDK, including the latest package release summaries and platform updates.
source: https://eu-de.quantum.cloud.ibm.com/docs/en/guides/changelog-qiskit
---

# Qiskit SDK v2.3

## January 2026

- Building on the momentum established across the v2.x series, which has centered on positioning Qiskit as the leading platform for hybrid quantum-HPC workflows, [Qiskit SDK v2.3](https://www.ibm.com/quantum/blog/qiskit-2-3-release-summary) delivers a significant expansion of the C API alongside faster, more flexible tools for building and optimizing quantum circuits.

  Major updates include:

  - **Custom transpiler passes in C** - Write custom transpiler passes through Qiskit's C API using the new `QkDag` object and an expanded `QkTarget` object, which enable step-by-step inspection, modification, and extension of the compilation process - without rebuilding the entire compiler pipeline.

  - **Faster hardware layout selection** - Upgrades and Rust-driven performance enhancements to `VF2Layout` and `VF2PostLayout` improve the speed and scalability of circuit-to-hardware layout selection, reducing compilation overhead and improving fidelity on quantum hardware.

  - **New multi-qubit Pauli measurement** - The new `PauliProductMeasurement` instruction enables joint projective measurement across multiple qubits in a single operation, unlocking compilation to Pauli-based computation - a common representation in fault-tolerant quantum computing.

  - **Improvements in early fault-tolerant transpilation** - Performance and feature enhancements for transpilation to early fault-tolerant targets - especially Clifford+T targets - help users more efficiently build transpilation pipelines for future QPUs.

  These capabilities give developers greater flexibility to customize quantum circuit optimizations and integrate with existing HPC workflows. [Visit the blog](https://www.ibm.com/quantum/blog/qiskit-2-3-release-summary) for the full technical summary.

Wondering what has changed? Read the [changelog](https://github.com/Qiskit/qiskit/releases/tag/2.3.0) and the [v2.3 release notes](/docs/api/qiskit/release-notes/2.3).

*To see the release notes for all versions, visit the [Qiskit SDK release notes](/docs/api/qiskit/release-notes).*