diff --git a/Dockerfile b/Dockerfile
index c41738e..26b72fd 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,8 @@
 FROM debian
 
+ENV DEBIAN_FRONTEND noninteractive
+ENV LANG C.UTF-8
+
 RUN apt-get update && apt-get -y upgrade && \
     apt-get -y install python3 python3-pip \
                        python3-flask python3-flask-sqlalchemy python3-flask-httpauth python3-flaskext.wtf \