From cff2c043ecf84c02831f949e3d5f55fbac73003d Mon Sep 17 00:00:00 2001
From: Kentaro Wada <www.kentaro.wada@gmail.com>
Date: Sun, 16 Feb 2020 20:10:18 +0000
Subject: [PATCH] Use bionic for docker image

---
 docker/Dockerfile | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/docker/Dockerfile b/docker/Dockerfile
index ecbb125d9..d262843be 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -1,9 +1,10 @@
-FROM ubuntu:xenial
+FROM ubuntu:bionic
 LABEL maintainer "Kentaro Wada <www.kentaro.wada@gmail.com>"
 
+ENV DEBIAN_FRONTEND=noninteractive
+
 RUN \
   apt-get update -qq && \
-  apt-get upgrade -qq -y && \
   apt-get install -qq -y \
     git \
     python3 \