diff --git a/.travis.yml b/.travis.yml
index 325a2789..9d293157 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,4 +1,5 @@
 language: php
+dist: bionic
 
 services:
   - mysql
@@ -14,7 +15,7 @@ php:
   - '7.4'
 
 install:
-  - composer install
+  - composer install -o
   # Compile assets
   - yarn install
   - yarn build
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index 9cc17b6e..f2b1ddf3 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -2,7 +2,7 @@
 
 <!-- https://phpunit.de/manual/current/en/appendixes.configuration.html -->
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/6.5/phpunit.xsd"
+         xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/8.3/phpunit.xsd"
          backupGlobals="false"
          colors="true"
          bootstrap="config/bootstrap.php"