diff --git a/.changeset/tender-cameras-care.md b/.changeset/tender-cameras-care.md
new file mode 100644
index 0000000..2ff758d
--- /dev/null
+++ b/.changeset/tender-cameras-care.md
@@ -0,0 +1,5 @@
+---
+'@inkathon/frontend': patch
+---
+
+Fix `@polkadot/*` package warnings about cjs/esm duplications.
diff --git a/frontend/next.config.js b/frontend/next.config.js
index 21ffcb7..e907127 100644
--- a/frontend/next.config.js
+++ b/frontend/next.config.js
@@ -5,7 +5,21 @@
 /**
  * @type {import('next').NextConfig}
  **/
-let nextConfig = {}
+let nextConfig = {
+  // Fix for warnings about cjs/esm package duplication
+  // See: https://github.com/polkadot-js/api/issues/5636
+  transpilePackages: [
+    '@polkadot/api',
+    '@polkadot/api-contract',
+    '@polkadot/extension-dapp',
+    '@polkadot/extension-inject',
+    '@polkadot/keyring',
+    '@polkadot/types',
+    '@polkadot/types-support',
+    '@polkadot/util',
+    '@polkadot/util-crypto',
+  ],
+}
 
 const withTwin = require('./withTwin.js')
 nextConfig = withTwin(nextConfig)