diff --git a/index.d.ts b/index.d.ts
index 0b971e3..3fe3bb5 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -65,6 +65,7 @@ export type AwsLambdaRuntime =
   | "nodejs14.x"
   | "nodejs16.x"
   | "nodejs18.x"
+  | "nodejs20.x"
   | "provided"
   | "provided.al2"
   | "python3.7"