Runnig commands in my MongoDB shell, I get the warning

MongoDB shell version v3.4.4
WARNING: shell and server versions do not match
MongoDB server version: 3.6.12

The thing is, I had to use an old version of MongoDB when deploying my MongoDB using this stable helm chart (dating back to Jun 1, 2019) because my client relied on old syntax. On the other hand, I am using an Alpine image to create the initial databases and users. That container is using the latest version of MongoDB (I don't specify a version when running ask add -U mongoDB). My question is how can I figure out which version of MongoDB will be compatible here with what's present in my DB deployment.