diff --git a/__tests__/__helpers__/copy-to-website.js b/__tests__/__helpers__/copy-to-website.cjs
similarity index 100%
rename from __tests__/__helpers__/copy-to-website.js
rename to __tests__/__helpers__/copy-to-website.cjs
diff --git a/__tests__/__helpers__/fix-version-number.js b/__tests__/__helpers__/fix-version-number.cjs
similarity index 100%
rename from __tests__/__helpers__/fix-version-number.js
rename to __tests__/__helpers__/fix-version-number.cjs
diff --git a/package-scripts.cjs b/package-scripts.cjs
index 1cc093f3c..054035074 100644
--- a/package-scripts.cjs
+++ b/package-scripts.cjs
@@ -92,10 +92,10 @@ module.exports = {
       codemirrorify:
         '(cd website/packages/codemirrorify && npm install && npm run build)',
       cpstatic:
-        'cp website/packages/codemirrorify/dist/main.js website/static/js/codemirrorify.js && node __tests__/__helpers__/copy-to-website.js',
+        'cp website/packages/codemirrorify/dist/main.js website/static/js/codemirrorify.js && node __tests__/__helpers__/copy-to-website.cjs',
       build: '(cd website && npm install && npm run build)',
       dev: '(cd website && npm start)',
-      publish: '(cd website && node ./scripts/deploy-gh-pages.js)',
+      publish: '(cd website && node ./scripts/deploy-gh-pages.cjs)',
     },
     // ATTENTION:
     // LIST OF SAFE PORTS FOR SAUCE LABS (Edge and Safari) https://wiki.saucelabs.com/display/DOCS/Sauce+Connect+Proxy+FAQS#SauceConnectProxyFAQS-CanIAccessApplicationsonlocalhost?
@@ -143,7 +143,7 @@ module.exports = {
     },
     prepublish: {
       default: series.nps('prepublish.version', 'build'),
-      version: `node __tests__/__helpers__/fix-version-number.js`,
+      version: `node __tests__/__helpers__/fix-version-number.cjs`,
     },
   },
 }
diff --git a/website/scripts/deploy-gh-pages.js b/website/scripts/deploy-gh-pages.cjs
similarity index 100%
rename from website/scripts/deploy-gh-pages.js
rename to website/scripts/deploy-gh-pages.cjs