diff --git a/packages/expect/index.d.ts b/packages/expect/index.d.ts
index 1f129c72f..3b82ac400 100644
--- a/packages/expect/index.d.ts
+++ b/packages/expect/index.d.ts
@@ -1,3 +1,3 @@
-import './dist/chai'
+import './dist/chai.cjs'
 
-export * from './dist/index'
+export * from './dist/index.js'
diff --git a/packages/expect/rollup.config.js b/packages/expect/rollup.config.js
index bf8c7f566..ca7d4a1c2 100644
--- a/packages/expect/rollup.config.js
+++ b/packages/expect/rollup.config.js
@@ -19,7 +19,7 @@ const plugins = [
   }),
   copy({
     targets: [
-      { src: 'node_modules/@types/chai/index.d.ts', dest: 'dist', rename: 'chai.d.ts' },
+      { src: 'node_modules/@types/chai/index.d.ts', dest: 'dist', rename: 'chai.d.cts' },
     ],
   }),
 ]