diff --git a/phpstan.neon b/phpstan.neon
index 903f25e..812ff8c 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -11,14 +11,14 @@ parameters:
     path: lib/functions.php
     count: 3
   -
-    message: "#^Result of && is always true\\.$#"
+    rawMessage: "Result of && is always true."
     path: lib/functions.php
     count: 1
   -
-    message: "#^Strict comparison using !== between '' and non-falsy-string will always evaluate to true\\.$#"
+    rawMessage: "Strict comparison using !== between '' and non-falsy-string will always evaluate to true."
     path: lib/functions.php
     count: 1
   -
-    message: "#^Strict comparison using === between false and string will always evaluate to false\\.$#"
+    rawMessage: "Strict comparison using === between false and string will always evaluate to false."
     path: lib/functions.php
     count: 2
diff --git a/tests/phpunit.xml b/tests/phpunit.xml
index 2bef7c9..2e241c7 100644
--- a/tests/phpunit.xml
+++ b/tests/phpunit.xml
@@ -6,6 +6,7 @@
          beStrictAboutOutputDuringTests="true"
          failOnRisky="true"
          failOnWarning="true"
+         failOnDeprecation="true"
          xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/10.5/phpunit.xsd"
          cacheDirectory=".phpunit.cache">
   <testsuites>