diff --git a/Dockerfile b/Dockerfile
index 425b4e5..3e96ae0 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -6,7 +6,7 @@ RUN pip install --no-cache-dir -r requirements.txt
 
 EXPOSE 5000
 
-RUN useradd app
+RUN adduser -D app
 USER app
 
 CMD ["gunicorn","-w 2", "-b 0.0.0.0:5000", "wsgi:app"]