diff --git a/Dockerfile b/Dockerfile
index ca00d38..539854b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,7 +2,7 @@ FROM python:3.6-stretch as base
 
 RUN apt-get update
 RUN apt-get install -y --no-install-recommends \
-    build-essential git make gcc libtool libmhash-dev asciidoc
+    build-essential xmllint git make gcc libtool libmhash-dev asciidoc
 
 # Install deps
 RUN pip install snakeoil