diff --git a/Dockerfile b/Dockerfile
index ff6243c..c01b710 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -14,7 +14,7 @@ ENV GNUPGHOME /.gnupg
 RUN echo deb http://repo.aptly.info/ squeeze main >> /etc/apt/sources.list
 RUN apt-key adv --keyserver keys.gnupg.net --recv-keys E083A3782A194991
 RUN apt-get update && \
-    apt-get install -y aptly && \
+    apt-get install -y aptly xz-utils && \
     apt-get clean
 
 ADD debify.sh /debify.sh