diff --git a/Dockerfile b/Dockerfile
index 00c4267..ede5d6c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,10 +2,9 @@ FROM ubuntu:xenial
 
 RUN apt-get update
 RUN apt-get -y upgrade
-RUN apt-get install -y python3 python3-pip python3-lxml python3-cssutils libxml2-dev libxslt1-dev inkscape libav-tools
-RUN apt-get install -y zlib1g-dev
+RUN apt-get install -y python3 python3-pip python3-lxml python3-cssutils libxml2-dev libxslt1-dev inkscape libav-tools zlib1g-dev
 
 ADD . /app
 WORKDIR /app
 
-RUN pip3 install -r requirements.txt
\ No newline at end of file
+RUN pip3 install -r requirements.txt