Hi folks. We self host Growthbook v3.3.0 and our instance is backed by a MongoDB. We are currently upgrading our MongoDB instances from v7 to v8 and I'd like to verify whether this should cause any issues. Is there any documentation on supported MongoDB versions for different Growthbook releases? I can't see anything too controversial in the Mongo Release notes but wanted to double check if there was a way I could verify compatibility. Thanks!

Hi @most-pizza-11069 👋 I don't believe we currently publish a formal MongoDB compatibility matrix by GrowthBook version. From what I'm aware of, GrowthBook primarily relies on standard MongoDB features via the MongoDB driver and doesn't have any known MongoDB 8-specific incompatibilities, but I haven't personally validated v3.3.0 against MongoDB 8. Is there a specific reason you're hosting the legacy 3.3 version? We just released 4.3, which has a lot of cool API features. I can however, see that GrowthBook v3.3.0 was released after MongoDB 8 became available, so it's plausible that customers were already running MongoDB 8 with that version, but I haven't found anything confirming this. To be on the precautionary side, before upgrading production, I'd recommend testing the upgrade in a staging environment with a copy of your GrowthBook instance and verifying core workflows such as logins, feature publishing, experiment creation, SDK payload generation, and scheduled jobs.

We have upgraded our cloud db from 7 to 8 and have had no issues. So this should be safe for you to do.

Thanks both for your input. We have carried out the upgrade and it went smoothly