diff --git a/.travis.yml b/.travis.yml
index 59a4489..58d570a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,8 +1,16 @@
+dist: xenial
+
+addons:
+  apt:
+    packages:
+      - ant-optional
+
 language: php
 
 php:
-  - "7.1"
+  - "7.3"
   - "7.2"
+  - "7.1"
 
 env:
   - CONTAO_VERSION=contao/core-bundle ~4.4.0