diff --git a/backend/Dockerfile b/backend/Dockerfile
index ed72b32..d566e89 100644
--- a/backend/Dockerfile
+++ b/backend/Dockerfile
@@ -54,14 +54,14 @@ RUN chown -R appuser:appgroup /app
 USER appuser
 
 # Expose port
-EXPOSE 8080
+EXPOSE 8521
 
 # Health check
 HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
-    CMD wget -qO- http://localhost:8080/health || exit 1
+    CMD wget -qO- http://localhost:8521/health || exit 1
 
 # Environment defaults
-ENV PORT=8080 \
+ENV PORT=8521 \
     TZ=America/Sao_Paulo
 
 CMD ["./main"]