diff --git a/src/LambdaFunction.php b/src/LambdaFunction.php
index 0bb0d3f..7524e54 100644
--- a/src/LambdaFunction.php
+++ b/src/LambdaFunction.php
@@ -234,7 +234,7 @@ public function toPendingResult(PromiseInterface $raw)
      */
     public function runtime()
     {
-        return Runtime::NODEJS_14;
+        return Runtime::NODEJS_20;
     }
 
     /**