--- a/services/web/modules/server-ce-scripts/scripts/check-mongodb.mjs
+++ b/services/web/modules/server-ce-scripts/scripts/check-mongodb.mjs
@@ -7,6 +7,7 @@ import {
 const { ObjectId } = mongodb

 const MIN_MONGO_VERSION = [6, 0]
+const MIN_MONGO_FEATURE_COMPATIBILITY_VERSION = [6, 0]

 async function main() {
   let mongoClient
@@ -18,6 +19,7 @@ async function main() {
   }

   await checkMongoVersion(mongoClient)
+  await checkFeatureCompatibilityVersion(mongoClient)

   try {
     await testTransactions(mongoClient)
@@ -53,6 +55,41 @@ async function checkMongoVersion(mongoClient) {
   }
 }

+async function checkFeatureCompatibilityVersion(mongoClient) {
+  const {
+    featureCompatibilityVersion: { version },
+  } = await mongoClient
+    .db()
+    .admin()
+    .command({ getParameter: 1, featureCompatibilityVersion: 1 })
+  const [major, minor] = version.split('.').map(v => parseInt(v))
+  const [minMajor, minMinor] = MIN_MONGO_FEATURE_COMPATIBILITY_VERSION
+
+  if (major < minMajor || (major === minMajor && minor < minMinor)) {
+    const minVersion = MIN_MONGO_FEATURE_COMPATIBILITY_VERSION.join('.')
+    console.error(`
+The MongoDB server has featureCompatibilityVersion=${version}, but Overleaf requires at least version ${minVersion}.
+
+Open a mongo shell:
+- Overleaf Toolkit deployments: $ bin/mongo
+- Legacy docker-compose.yml deployments: $ docker exec -it mongo mongosh localhost/sharelatex
+
+In the mongo shell:
+> db.adminCommand( { setFeatureCompatibilityVersion: "${minMajor}.${minMinor}" } )
+
+Verify the new value:
+> db.adminCommand( { getParameter: 1, featureCompatibilityVersion: 1 } )
+ ...
+ {
+    featureCompatibilityVersion: { version: ${minMajor}.${minMinor}' },
+...
+
+Aborting.
+`)
+    process.exit(1)
+  }
+}
+
 main()
   .then(() => {
     console.error('Mongodb is up.')