MongoDB driver vs server version mismatch (compatibility) in CI

By Kaveh Alemi·Latchkey

The Node driver and the mongod server versions are outside each other supported range. CI pins one but not the other, so a command the driver expects is unsupported, or the server rejects the driver handshake.

What this error means

Connection or commands fail with messages like "Server at ... reports maximum wire version N, but this version of the driver requires at least M" or an unsupported-command error after an image bump.

MongoCompatibilityError: Server at localhost:27017 reports maximum wire version 6,
but this version of the Node.js Driver requires at least 7 (MongoDB 4.0)

Common causes

The service image and driver drifted apart

The mongo: service image was bumped (or is very old) while the driver in package.json stayed pinned, crossing the supported wire-version range.

A too-new server feature used by an old driver

A newer server default or feature is not understood by an older driver, so a command is reported unsupported.

How to fix it

Pin compatible driver and server versions

1. Check the driver compatibility matrix for the server version.
2. Pin the mongo: service image and the driver to a supported pair.
3. Bump both together, not one at a time.

services:
  mongo:
    image: mongo:7   # keep in sync with the pinned driver

Upgrade the lagging side

Update whichever is out of range (usually the driver) so the wire versions overlap.

npm install mongodb@6

How to prevent it

• Pin both the service image and the driver, and bump them together.
• Consult the compatibility matrix before upgrading either side.
• Test against the same server major version you run in production.

Frequently asked questions

Related guides

References

• GitHub Actions documentation