diff --git a/server/server.js b/server/server.js
index 3394a97..bc6c7d5 100644
--- a/server/server.js
+++ b/server/server.js
@@ -19,8 +19,7 @@ const {exec} = require('child_process');
 // cluster mode
 const cluster = require('cluster');
 const envWorkerNum = process.env.NODE_WORKER_COUNT;
-const cpuCount = require('os').cpus().length;
-const numWorkers = (envWorkerNum) ? envWorkerNum : cpuCount;
+const numWorkers = (envWorkerNum) ? envWorkerNum : 2;
 
 // own modules
 const config = require('./config/config');