Error: A Serverless Function has exceeded the unzipped maximum size of 250 MB. : https://vercel.link/serverless-function-size

I am trying to deploy my python project with fastapi using vercel, but keep on facing this error: Error: A Serverless Function has exceeded the unzipped maximum size of 250 MB. : https://vercel.link/serverless-function-size. this is my vercel.json: { "builds": [ { "src": "/api/main.py", "use": "/python", "config": { "excludeFiles": "/{.next,.cache,node_modules,public,app}/**" } } ], "routes": [ { "src": "/(.)", "dest": "api/main.py" } ]

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this is my build system report. ▲ Build system report

14:18:20.586• No memory or disk space problems detected

14:18:20.586• Folder sizes on disk:

14:18:20.586 ‣ Input source code: 234 MB

14:18:20.586 ‣ Build cache: <1 MB

14:18:20.586 ‣ Output files: 3 MB

14:18:20.586 ‣ Node modules: 157 MB

14:18:20.586• No files larger than 100 MB detected on disk

How can deploy my application without this error

Vercel Alum

Hi, ! Welcome to the Vercel Community

It looks like you exceeded the maximum size of 250 MB on your project.

From the documentation:

For Serverless Functions, the maximum uncompressed size is 250 MB including layers which are automatically used depending on runtimes. These limits are enforced by AWS.

You can use includeFiles and excludeFiles to specify items which may affect the function size, however the limits cannot be configured. These configurations are not supported in Next.js, instead use outputFileTracingIncludes.

Vercel Alum

Just wanted to flag that Vercel has doubled the Python Functions bundle size limit — it's now 500MB unzipped (previously 250MB).

If your FastAPI project was close to or just over the old 250MB cap, you should be able to redeploy as-is without needing to trim dependencies. Hope this helps!

Reference: https://vercel.com/changelog/python-vercel-functions-bundle-size-limit-increased-to-500mb

Vercel

Python Vercel Functions bundle size limit increased to 500MB - Vercel

The bundle size limit for Python Vercel Functions has increased from 250MB to 500MB, allowing larger dependencies and assets in a single deployment. Learn more in the docs or deploy FastAPI or Flask to get started.

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