Usually no — FusionAuth upgrades do not log users out or invalidate tokens.

However, there is one important exception: if your upgrade path includes v1.60.0, some tokens may be invalidated due to changes in token structure. The specific changes are deterministic and documented in the release notes:

FusionAuth 1.60.0 Release Notes

Even when tokens are invalidated in v1.60.0, users with a valid refresh token should self-heal without needing to manually log in again.

Additionally, if your upgrade path includes v1.69.0, be aware of changes to key management that may require attention. Review the migration guide:

1.69.0 Migration Guide

Recommendation: Review the release notes for any versions in your upgrade path to understand specific token behavior changes and plan accordingly.

Usually no, upgrades don't log users out or invalidate tokens.

The one exception is if your upgrade path includes v1.60.0, where some tokens may be invalidated. Even then, users with a refresh token should self-heal without needing to log in again.

For most upgrade scenarios, you can expect minimal impact on active user sessions.