diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d4983d9..f7ef07a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -27,6 +27,7 @@ jobs:
         with:
           php-version: ${{ matrix.php }}
           coverage: xdebug
+          ini-file: development
       - run: composer install
       - run: vendor/bin/phpunit --coverage-text --stderr
         if: ${{ matrix.php >= 7.3 }}
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index ea22d4c..2c828a1 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -1,11 +1,12 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
 <!-- PHPUnit configuration file with new format for PHPUnit 9.5+ -->
-<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.5/phpunit.xsd"
          bootstrap="vendor/autoload.php"
+         cacheResult="false"
          colors="true"
-         cacheResult="false">
+         convertDeprecationsToExceptions="true">
     <testsuites>
         <testsuite name="Framework X test suite">
             <directory>./tests/</directory>
@@ -19,5 +20,10 @@
     </coverage>
     <php>
         <ini name="error_reporting" value="-1" />
+        <!-- Evaluate assertions, requires running with "php -d zend.assertions=1 vendor/bin/phpunit" -->
+        <!-- <ini name="zend.assertions=1" value="1" /> -->
+        <ini name="assert.active" value="1" />
+        <ini name="assert.exception" value="1" />
+        <ini name="assert.bail" value="0" />
     </php>
 </phpunit>
diff --git a/phpunit.xml.legacy b/phpunit.xml.legacy
index 4b0eafb..8b1885e 100644
--- a/phpunit.xml.legacy
+++ b/phpunit.xml.legacy
@@ -16,4 +16,12 @@
             <directory>./src/</directory>
         </whitelist>
     </filter>
+    <php>
+        <ini name="error_reporting" value="-1" />
+        <!-- Evaluate assertions, requires running with "php -d zend.assertions=1 vendor/bin/phpunit" -->
+        <!-- <ini name="zend.assertions=1" value="1" /> -->
+        <ini name="assert.active" value="1" />
+        <ini name="assert.exception" value="1" />
+        <ini name="assert.bail" value="0" />
+    </php>
 </phpunit>