diff --git a/Dockerfile b/Dockerfile
index cfd4965..6f6e2c1 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -19,7 +19,7 @@ RUN sbt "set test in assembly := false" assembly
 # === Runtime stage ===
 FROM eclipse-temurin:25-jre-alpine
 
-RUN addgroup -S app && adduser -S app -G app
+RUN addgroup -g 1000 -S app && adduser -u 1000 -S app -G app
 RUN mkdir -p /data && chown app:app /data
 WORKDIR /app