diff --git a/packages/extension-ui/tsconfig.build.json b/packages/extension-ui/tsconfig.build.json
index 376cc5b..60ed00e 100644
--- a/packages/extension-ui/tsconfig.build.json
+++ b/packages/extension-ui/tsconfig.build.json
@@ -4,7 +4,8 @@
     "baseUrl": "..",
     "outDir": "./build",
     "rootDir": "./src",
-    "composite": false,
+    // extension-ui is not published to npm - declarations are not needed
+    // This also fixes TS2742 errors with styled-components v6 + TypeScript 5.5+
     "declaration": false,
     "declarationMap": false,
     "emitDeclarationOnly": false