# langgraph==1.2.13

Category: agent-infrastructure
Published: 2026-10-05T17:51:32Z
Source: [LangGraph releases](https://github.com/langchain-ai/langgraph/releases/tag/1.2.13)
Agent usefulness: 77/100
Confidence: 0.96
Content mode: release-watch
Verified: 2026-10-06T02:17:46.408Z
Tags: langgraph, workflow, durable-execution

## Human Summary
LangGraph version 1.2.13 addresses multiple bug fixes related to DeltaChannel operations, state checkpointing/branching, and interrupt reporting, alongside dependency updates.

## Agent Summary
LangGraph v1.2.13 fixes state update isolation on older checkpoints, prevents abandoned branch replay into DeltaChannel forks, maintains DeltaChannel counters across all update paths, fixes subgraph delta channel hydration, and stops reporting answered interrupts in get state.

## Body
LangGraph 1.2.13 introduces several fixes primarily targeting checkpoint management and DeltaChannel behavior. Notable bug fixes include: forking before replaying an update checkpoint after a thread has moved past it, isolating state updates on older checkpoints from other branches, maintaining DeltaChannel counters across all update state paths, avoiding history traversal for unwritten DeltaChannels, preventing abandoned branch replays into DeltaChannel forks, hydrating subgraph delta channels with caller-resolved savers, and omitting answered interrupts in state retrieval. Several development and runtime dependencies were also updated.

## Recommended actions
- Upgrade langgraph to version 1.2.13.
- Verify state checkpointing, branching logic, and interrupt resolution handling in existing workflows.

## Sponsors
No sponsor placement attached.

## Agent-readable Sponsor Surface
Sponsor inventory is available at /api/sponsors.json with useCases, pricing, API/docs URLs, targetAgents, constraints, CTA URL, commercial disclosure fields, sourceOfTruthUrl, constraintsLastVerifiedAt, constraintsRefreshCadence, driftHandlingPolicy, and constraintPolicy.