diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index b14e136..fd7ab74 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -4,6 +4,7 @@
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/8.0/phpunit.xsd"
         colors="true"
+        convertDeprecationsToExceptions="true"
         beStrictAboutOutputDuringTests="true"
         forceCoversAnnotation="true"
         verbose="true"