diff --git a/Dockerfile b/Dockerfile
index c0455ce..e90d68e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:16.04
+FROM ubuntu:18.04
 
 ADD ./sources.list /etc/apt/sources.list
 
diff --git a/run.sh b/run.sh
index d8b36d6..ac4fcf4 100644
--- a/run.sh
+++ b/run.sh
@@ -137,8 +137,7 @@ npm update -g --loglevel info npm
 
 # install some npm packages
 NPM_PKGS="
-    coffee-script
-    coffeelint
+    yarn
 "
 
 for PKG in $NPM_PKGS ; do
diff --git a/sources.list b/sources.list
index 987eb0a..30e191e 100644
--- a/sources.list
+++ b/sources.list
@@ -1,4 +1,4 @@
-deb mirror://mirrors.ubuntu.com/mirrors.txt xenial main universe
-deb mirror://mirrors.ubuntu.com/mirrors.txt xenial-updates main universe
-deb mirror://mirrors.ubuntu.com/mirrors.txt xenial-security main universe
-deb mirror://mirrors.ubuntu.com/mirrors.txt xenial-backports main universe
+deb mirror://mirrors.ubuntu.com/mirrors.txt bionic main universe multiverse restricted
+deb mirror://mirrors.ubuntu.com/mirrors.txt bionic-updates main universe multiverse restricted
+deb mirror://mirrors.ubuntu.com/mirrors.txt bionic-security main universe multiverse restricted
+deb mirror://mirrors.ubuntu.com/mirrors.txt bionic-backports main universe multiverse restricted