diff --git a/.travis.yml b/.travis.yml
index e02c920..d526bb3 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,14 +1,15 @@
 language: php
 
 php:
-  - 7.0
-  - 7.1
-  - 7.2
+  - "7.0"
+  - "7.1"
+  - "7.2"
+  - "7.3"
 
 before_script:
   - composer self-update
   - composer install --no-interaction --prefer-source
-  - wget -O phpunit.phar https://phar.phpunit.de/phpunit-6.5.6.phar
+  - wget -O phpunit.phar https://phar.phpunit.de/phpunit-6.5.14.phar
 
 script:
   - php phpunit.phar --configuration ./phpunit.xml