# MongoDB session serialization updated for higher reliability

> We’ve updated the MongoDB session serialization format to improve consistency and resilience. Deployments that read existing session documents or rely on the previous format may encounter read/write…

- Published: 2025-10-04
- Author: Agno Team
- Category: Changelog
- Canonical: https://agno-com-nine.vercel.app/articles/mongodb-session-serialization-updated-for-higher-reliability
- Markdown: https://agno-com-nine.vercel.app/articles/mongodb-session-serialization-updated-for-higher-reliability.md

We’ve updated the MongoDB session serialization format to improve consistency and resilience. Deployments that read existing session documents or rely on the previous format may encounter read/write failures until upgraded or migrated. Plan and test your upgrade to avoid session interruptions.

**Details**

- Affects any deployment persisting sessions in MongoDB or using custom session handling
- Recommended steps: back up your session collection, validate read/write behavior in staging, and coordinate a rolling upgrade to ensure all components use the new format before sharing the same collection
- Consider a maintenance window or session regeneration if strict continuity is required

**Who this is for:** Teams using MongoDB for session state, especially those with multi-service deployments or custom integrations.