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+---
+title: Webpack Build Worker automatic opt-out
+---
+
+## Webpack Build Worker Opt-out
+
+#### Why This Error Occurred
+
+The Next.js config contains custom webpack configuration, as a result, the webpack build worker optimization was disabled.
+
+The webpack build worker optimization helps alleviate memory stress during builds and reduce out-of-memory errors although some custom configurations may not be compatible.
+
+#### Possible Ways to Fix It
+
+Upgrade Next.js to latest (>= 14.1.0) to remove this warning.
+
+```
+npm i next@latest
+```