diff --git a/packages/core/dev-utils.js b/packages/core/dev-utils.js
index e5882c7d..9e8b8587 100644
--- a/packages/core/dev-utils.js
+++ b/packages/core/dev-utils.js
@@ -16,7 +16,7 @@ exports.createRollupConfig = (typescript) => {
         format: "esm",
         exports: "auto",
       },
-      plugins: [nodeResolve({ extensions }), typescriptPlugin({ typescript })],
+      plugins: [nodeResolve({ extensions }), typescriptPlugin({ typescript, target: 'ES6', })],
     },
     {
       external,
@@ -26,7 +26,7 @@ exports.createRollupConfig = (typescript) => {
         format: "cjs",
         exports: "auto",
       },
-      plugins: [nodeResolve({ extensions }), typescriptPlugin({ typescript })],
+      plugins: [nodeResolve({ extensions }), typescriptPlugin({ typescript, target: 'ES6', })],
     },
   ];
 };