diff --git a/package.json b/package.json
index 3579e9a..ebcb5fc 100644
--- a/package.json
+++ b/package.json
@@ -25,7 +25,7 @@
     "nyc": "^13.0.1",
     "opener": "^1.4.3",
     "rimraf": "^2.6.2",
-    "rollup": "^0.66.4",
+    "rollup": "^1.16.7",
     "rollup-plugin-sourcemaps": "^0.4.2",
     "vuepress": "^0.14.4",
     "warun": "^1.0.0"
diff --git a/rollup.config.js b/rollup.config.js
index 38ee717..069f8e1 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -16,9 +16,8 @@ function config(ext) {
             file: `index${ext}`,
             format: ext === ".mjs" ? "es" : "cjs",
             sourcemap: true,
-            sourcemapFile: `index${ext}.map`,
-            strict: true,
-            banner: `/*! @author Toru Nagashima <https://github.com/mysticatea> */`,
+            banner:
+                "/*! @author Toru Nagashima <https://github.com/mysticatea> */",
         },
         plugins: [sourcemaps()],
         external: Object.keys(require("./package.json").dependencies),