LangGraph 1.2.21 released
A patch release that fixes subgraph namespace handling and improves interrupt error documentation.
What changed in 1.2.21
- Fixed subgraph namespace matching to correctly identify whole namespace segments in get_subgraphs.
- Fixed reading of undeclared subgraph namespaces from parent graphs.
- Clarified that each interrupt() call has its own id in UnknownInterruptError messages.
- Updated dependencies including filelock and langgraph-api for security fixes.
Summarised by AgentGid from LangChain's official release notes on GitHub, as reported there; read the original before relying on it. Price, status and release dates come from our daily data.
LangGraph at a glance
| What it is | A low-level orchestration framework for building stateful agents as graphs, with durable execution, persistence and human-in-the-loop steps. Available for Python and JavaScript. |
|---|---|
| Latest version | 1.2.22, Nov 14, 2026. This page is about an earlier release. |
| Release pace | 7 stable releases in the last 30 days; 1.2.21 came 7 days after the previous one |
| Price | Free (OSS). LangGraph is open source and free to use; you pay only for the models and infrastructure it runs on. (checked Nov 5, 2026) |
| Downloads, last 7 days | 19M up 1.7% |
| Gid Score | 74 #2 in Agent frameworks and SDKs |
