diff --git a/libs/python/bench-ui/bench_ui/child.py b/libs/python/bench-ui/bench_ui/child.py
index 1c19c12c..b345b68e 100644
--- a/libs/python/bench-ui/bench_ui/child.py
+++ b/libs/python/bench-ui/bench_ui/child.py
@@ -167,7 +167,7 @@ def main():
     print(json.dumps({"pid": os.getpid(), "port": port}), flush=True)
 
     # Start GUI (blocking)
-    webview.start()
+    webview.start(debug=os.environ.get("CUA_BENCH_UI_DEBUG", "false").lower() in ("true", "1"))
 
 
 if __name__ == "__main__":
diff --git a/libs/python/bench-ui/pyproject.toml b/libs/python/bench-ui/pyproject.toml
index 7464c901..101d9a31 100644
--- a/libs/python/bench-ui/pyproject.toml
+++ b/libs/python/bench-ui/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "pdm.backend"
 
 [project]
 name = "cua-bench-ui"
-version = "0.3.0"
+version = "0.4.0"
 description = "Lightweight webUI window controller for CUA bench using pywebview"
 readme = "README.md"
 authors = [