diff --git a/claude/Dockerfile b/claude/Dockerfile
index 466933b..be509a0 100644
--- a/claude/Dockerfile
+++ b/claude/Dockerfile
@@ -11,9 +11,9 @@ RUN apk add --no-cache \
 # Entrypoint used by the webui service (ttyd wrapping claude)
 COPY --chmod=755 webui-entrypoint.sh /usr/local/bin/webui-entrypoint.sh
 
-# Create non-root user
-RUN addgroup -g 1000 claude \
-    && adduser -u 1000 -G claude -s /bin/bash -D claude
+# Create non-root user (node:20-alpine reserves gid/uid 1000 for the node user)
+RUN addgroup -g 1001 claude \
+    && adduser -u 1001 -G claude -s /bin/bash -D claude
 
 # Install Claude Code globally (runs as root for npm -g, then drops)
 RUN npm install -g @anthropic-ai/claude-code