diff --git a/Dockerfile b/Dockerfile
index 398ddf6..c144824 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,12 +1,13 @@
 FROM ubuntu:14.04
 
-RUN apt-get update
-RUN apt-get -y install python-software-properties software-properties-common
-RUN add-apt-repository ppa:chris-lea/libsodium
-RUN echo "deb http://ppa.launchpad.net/chris-lea/libsodium/ubuntu trusty main" >> /etc/apt/sources.list
-RUN echo "deb-src http://ppa.launchpad.net/chris-lea/libsodium/ubuntu trusty main" >> /etc/apt/sources.list
-RUN apt-get update
-RUN apt-get install -y libsodium-dev python-pip
+RUN apt-get update && apt-get install -y \
+    python-software-properties \
+    software-properties-common \
+ && add-apt-repository ppa:chris-lea/libsodium \
+ && echo "deb http://ppa.launchpad.net/chris-lea/libsodium/ubuntu trusty main" >> /etc/apt/sources.list \
+ && echo "deb-src http://ppa.launchpad.net/chris-lea/libsodium/ubuntu trusty main" >> /etc/apt/sources.list \
+ && apt-get update \
+ && apt-get install -y libsodium-dev python-pip
 
 RUN pip install shadowsocks