diff --git a/Dockerfile b/Dockerfile
index e8a8e39..9269745 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -15,8 +15,7 @@ RUN truncate -s0 /tmp/preseed.cfg && \
        apt-get install -y tzdata
 ## cleanup of files from setup
 RUN rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
-RUN apt-get update && apt-get -y install python3-pip python3-psycopg2 libpq-dev gunicorn python3-ldap
-RUN apt-get update && apt-get -y upgrade
+RUN apt-get update && apt-get -y dist-upgrade && apt-get -y install python3-pip python3-psycopg2 libpq-dev gunicorn python3-ldap
 COPY requirements.txt requirements.txt
 RUN pip3 install -r requirements.txt
 EXPOSE 443