diff --git a/test/ecmascript/README.md b/test/ecmascript/README.md
index 42e99f5e..785a090a 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.js
 ```
\ No newline at end of file
diff --git a/test/ecmascript/update-all-data.js b/test/ecmascript/update-all-data.js
new file mode 100644
index 00000000..5fa0ffcb
--- /dev/null
+++ b/test/ecmascript/update-all-data.js
@@ -0,0 +1,14 @@
+const { readdir, writeFile } = require('fs/promises');
+const { join } = require('path');
+
+async function main() {
+  const files = await readdir(__dirname);
+  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(join(__dirname, file), text);
+  }
+}
+
+main().then(() => console.log('Done.')).catch(e => console.error(e));