diff --git a/package.json b/package.json
index b11a5c0..b9b6660 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@imagemarker/use-text-width",
-  "version": "0.3.1",
+  "version": "0.3.2",
   "description": "React hook to measure text width",
   "repository": "github:imagemarker/use-text-width",
   "keywords": [
diff --git a/rollup.config.js b/rollup.config.js
index b0f1691..d103de4 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -12,7 +12,7 @@ export default {
     dir: 'dist',
     name: 'useTextWidth',
     sourcemap: !production,
-    format: 'cjs',
+    format: 'es',
     globals: {
       'react': 'React',
       'react-dom': 'ReactDOM',