diff --git a/packages/protobuf-demo/package.json b/packages/protobuf-demo/package.json
index c46178f3..442bfdf2 100644
--- a/packages/protobuf-demo/package.json
+++ b/packages/protobuf-demo/package.json
@@ -38,6 +38,7 @@
     "define-proto": "pbts src/generated/codecimpl.js -o src/generated/codecimpl.d.ts"
   },
   "devDependencies": {
+    "@cosmjs/utils": "^0.20.0",
     "protobufjs": "^6.9.0"
   }
 }