diff --git a/test/ecmascript/README.md b/test/ecmascript/README.md
index 42e99f5e..6be488fc 100644
--- a/test/ecmascript/README.md
+++ b/test/ecmascript/README.md
@@ -9,10 +9,5 @@ In our case, we only need to test parsing and not actually execute the tests.
 You can run the following script from this directory to update this test suite.
 
 ```sh
-curl -L -o data-common.json https://raw.githubusercontent.com/kangax/compat-table/gh-pages/data-common.json
-curl -L -o data-es5.js https://raw.githubusercontent.com/kangax/compat-table/gh-pages/data-es5.js
-curl -L -o data-es6.js https://raw.githubusercontent.com/kangax/compat-table/gh-pages/data-es6.js
-curl -L -o data-es2016plus.js https://raw.githubusercontent.com/kangax/compat-table/gh-pages/data-es2016plus.js
-curl -L -o data-esintl.js https://raw.githubusercontent.com/kangax/compat-table/gh-pages/data-esintl.js
-curl -L -o data-esnext.js https://raw.githubusercontent.com/kangax/compat-table/gh-pages/data-esnext.js
+node update-all-data.mjs
 ```
\ No newline at end of file
diff --git a/test/ecmascript/update-all-data.mjs b/test/ecmascript/update-all-data.mjs
new file mode 100644
index 00000000..77dcc643
--- /dev/null
+++ b/test/ecmascript/update-all-data.mjs
@@ -0,0 +1,13 @@
+import { readdir, writeFile } from 'fs/promises';
+
+const dir = new URL('./', import.meta.url);
+const files = await readdir(dir);
+
+for (const file of files.filter(f => f.startsWith('data-'))) {
+  const url = `https://raw.githubusercontent.com/kangax/compat-table/gh-pages/${file}`;
+  const res = await fetch(url);
+  const text = await res.text();
+  await writeFile(new URL(file, dir), text);
+}
+
+console.log('Update complete!')