diff --git a/docsSrc/rollup.config.js b/docsSrc/rollup.config.mjs
similarity index 100%
rename from docsSrc/rollup.config.js
rename to docsSrc/rollup.config.mjs
diff --git a/package.json b/package.json
index dd150ad1..2ea04aba 100644
--- a/package.json
+++ b/package.json
@@ -24,7 +24,7 @@
     "build": "run-p build:*",
     "build:cjs": "tsc",
     "build:esm": "tsc -m es6 --outDir esm",
-    "docs": "tsc -p docsSrc && rollup -c docsSrc/rollup.config.js && rm -r docsSrc/esm",
+    "docs": "tsc -p docsSrc && rollup -c docsSrc/rollup.config.mjs && rm -r docsSrc/esm",
     "fmt": "prettier --write 'docs/**/*.html' 'src/**/*.ts' 'test/**/*.ts'",
     "test": "run-p test:*",
     "test:audit": "npm audit --audit-level=low",
diff --git a/rollup.config.js b/rollup.config.js
deleted file mode 100644
index 15707813..00000000
--- a/rollup.config.js
+++ /dev/null
@@ -1,7 +0,0 @@
-export default {
-  input: 'esm/index.js',
-  output: {
-    file: 'dist/index.js',
-    format: 'cjs',
-  },
-}