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Update dependency fastapi to <0.140#838

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Update dependency fastapi to <0.140#838
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renovate/fastapi-0.x

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@renovate renovate Bot commented Jun 14, 2026 •
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This PR contains the following updates:

Package Change Age Adoption Passing Confidence
fastapi (changelog) <0.137 → <0.140 age adoption passing confidence

Release Notes

fastapi/fastapi (fastapi)

v0.139.2

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Fixes
  • 🐛 Refactor router route building to make it thread-safe, mainly relevant for tests running in parallel threads (uncommon). PR #​16013 by @​tiangolo.

v0.139.1

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Fixes
Docs
  • 📝 Fix topic repository list not being displayed and skip_users not being applied. PR #​15995 by @​YuriiMotov.
Translations
Internal

v0.139.0

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Features
  • ✨ Support dependencies in app.frontend(), e.g. for automatic cookie authentication for the frontend. PR #​15908 by @​tiangolo.
Translations
Internal

v0.138.2

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Refactors
  • ♻️ Make app.frontend() return 404 for methods other than GET or HEAD with no static file matches. PR #​15863 by @​tiangolo.
Internal

v0.138.1

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Refactors
Internal

v0.138.0

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Features
  • ✨ Add support for app.frontend("/", directory="dist") and router.frontend("/", directory="dist"). PR #​15800 by @​tiangolo.
Docs
Translations
Internal

v0.137.2

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Features
  • ✨ Add iter_route_contexts() for advanced use cases that used to use router.routes (e.g. Jupyverse). PR #​15785 by @​tiangolo.
Translations
Internal

v0.137.1

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Fixes

v0.137.0

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Breaking Changes

Unblocks ✨ SO MANY THINGS ✨

Before this, router.include_router(other_router) would take each path operation from other_router and "clone" it, or recreate it from scratch.

This would mean that in the end there was only one top level router, part of the app.

The way it is structured here is that there are a few additional classes to handle intermediate metadata for router and route inclusion. That way the information of "router X includes Y and Y includes Z" is stored somewhere, without affecting (recreating / clonning) the final route.

Non Objectives

Dependencies for 404: previously I intended to support dependencies that would be executed even for 404, but that would conflict with the fact that a router could not find a match, but the next router did find a match. Executing dependencies in the router that did not find a match would not make sense, they could consume the request, body, etc. This original idea was discarded.

Specific Breaking Changes

Now router.routes is no longer a plain list of APIRoute objects, it can contain these intermediate objects that can contain additional routers, forming a tree.

Any logic that depended on iterating on the router.routes directly would be affected, that logic cannot expect to be able to extract data from a plain list of routes, as it's no longer a plain list but a tree.

Additionally, any logic that iterated on router.routes to modify them would now also see these new objects, and would not see all the routes in the app.

router.routes should be considered an internal implementation detail, only passed around to the FastAPI functions that need it.

Features
  • Adding routes (path operations) after a router is included now works, they are reflected as they are not copied.
  • Including subrouter in mainrouter can be done before adding routes (path operations) to subrouter, because now the the entire object is stored instead of copying the routes.
  • As routes are not copied, in some cases that might save some memory.
Alpha Features

This is not documented yet, so it's not officially supported yet and could change in the future.

But, as APIRoute and APIRouter instances are now preserved, they could be customized.

APIRouter has two new methods, .matches() and .handle(), counterpart to the existing ones in APIRoute. With this a router could customize how it matches and handles requests. For example, it could match only requests that include some specific header, for example for handling versions in headers.

Still, for now, consider this very experimental and potentially changing and breaking in the future.

Future Features Enabled
  • Custom APIRoute subclasses (undocumented, but alraedy works as desccribed above)
  • Custom APIRouter subclasses (undocumented, but already works as described above)
  • Dependencies per router
  • Exception handlers per router
  • Middleware per router
  • Other features planned
Docs
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Configuration

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🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

  • If you want to rebase/retry this PR, check this box

This PR was generated by Mend Renovate. View the repository job log.

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renovate Bot force-pushed the renovate/fastapi-0.x branch from d607840 to 42daac3 Compare June 18, 2026 20:34
@amotl

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@renovate renovate Bot changed the title chore(deps): update dependency fastapi to <0.138 chore(deps): update dependency fastapi to <0.139 Jun 20, 2026
@renovate
renovate Bot force-pushed the renovate/fastapi-0.x branch from 42daac3 to 866165b Compare June 20, 2026 02:55
@renovate renovate Bot changed the title chore(deps): update dependency fastapi to <0.139 Update dependency fastapi to <0.139 Jun 23, 2026
@renovate
renovate Bot force-pushed the renovate/fastapi-0.x branch from 866165b to ff977d8 Compare June 25, 2026 18:11
@amotl

amotl commented Jun 25, 2026

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The CI run here is failing because of a different issue. There is a fix.

@renovate renovate Bot changed the title Update dependency fastapi to <0.139 Update dependency fastapi to <0.140 Jul 1, 2026
@renovate
renovate Bot force-pushed the renovate/fastapi-0.x branch from ff977d8 to ef39a55 Compare July 1, 2026 22:44
@renovate
renovate Bot force-pushed the renovate/fastapi-0.x branch from ef39a55 to 314cee6 Compare July 16, 2026 18:13
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