diff --git a/.travis.yml b/.travis.yml
index 952b0986e..2be737b1e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,17 +1,22 @@
 language: bash
 sudo: false
 
 addons:
   apt:
     #sources:
     #  - debian-sid
     packages:
       - libxml2-utils
       - xsltproc
       - docbook
       - docbook-xml
+      - docbook-xsl
+      - docbook-defguide
+      - docbook-dsssl
+      - w3-recs
+      - opensp
       - shellcheck
 script:
   - ./ci/build.sh
 notifications:
   email: false