diff --git a/.travis.yml b/.travis.yml
index f28f762..a51a7ff 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -121,6 +121,7 @@ jobs:
 
       before_install:
         - composer self-update
+        - sudo apt-get install python3-dev python3-lxml
 
       install:
         - composer install --no-interaction --no-progress --no-suggest --prefer-dist --optimize-autoloader --no-dev