diff --git a/gulp/gulp-build.js b/gulp/gulp-build.js
index 3aa106b8fc..11f91b454f 100644
--- a/gulp/gulp-build.js
+++ b/gulp/gulp-build.js
@@ -51,7 +51,7 @@ gulp.task('build:prepare-mongo', async () => {
   console.log('MongoDB data folder is missing, setting up.'); // eslint-disable-line no-console
 
   // use run-rs without --keep, kill it as soon as the replica set starts
-  const runRsProcess = spawn('run-rs', ['-v', '4.2.8', '-l', 'ubuntu1804', '--dbpath', 'mongodb-data', '--number', '1', '--quiet']);
+  const runRsProcess = spawn('run-rs', ['-v', '4.1.1', '-l', 'ubuntu1804', '--dbpath', 'mongodb-data', '--number', '1', '--quiet']);
 
   for await (const chunk of runRsProcess.stdout) {
     const stringChunk = chunk.toString();
diff --git a/package.json b/package.json
index f2cea6e173..bcb1f6298c 100644
--- a/package.json
+++ b/package.json
@@ -106,7 +106,7 @@
     "client:unit": "cd website/client && npm run test:unit",
     "start": "gulp nodemon",
     "debug": "gulp nodemon --inspect",
-    "mongo:dev": "run-rs -v 4.2.8 -l ubuntu1804 --keep --dbpath mongodb-data --number 1 --quiet",
+    "mongo:dev": "run-rs -v 4.1.1 -l ubuntu1804 --keep --dbpath mongodb-data --number 1 --quiet",
     "postinstall": "git config --global url.\"https://\".insteadOf git:// && gulp build && cd website/client && npm install",
     "apidoc": "gulp apidoc"
   },