diff --git a/openclaw_assistant/Dockerfile b/openclaw_assistant/Dockerfile
index a36eec5..83eab75 100644
--- a/openclaw_assistant/Dockerfile
+++ b/openclaw_assistant/Dockerfile
@@ -27,7 +27,9 @@ RUN apk add --no-cache \
     nginx \
     ttyd \
     make \
-    cmake
+    cmake \
+    build-base \
+    linux-headers
 
 # Install Node.js 22+ (musl build) from unofficial builds.
 # Router/base image Alpine may ship an older libstdc++; we pull a newer libstdc++ from edge to satisfy Node's C++ symbols.
diff --git a/openclaw_assistant/config.yaml b/openclaw_assistant/config.yaml
index 6192e59..d674fbf 100644
--- a/openclaw_assistant/config.yaml
+++ b/openclaw_assistant/config.yaml
@@ -1,5 +1,5 @@
 name: OpenClaw Assistant
-version: "0.5.20"
+version: "0.5.21"
 slug: openclaw_assistant
 description: Run OpenClaw Assistant (OpenClaw-compatible) as a Home Assistant add-on.
 url: https://github.com/techartdev/OpenClawHomeAssistant