diff --git a/writing-tests.md b/writing-tests.md
index d688516..ea6d55c 100644
--- a/writing-tests.md
+++ b/writing-tests.md
@@ -98,7 +98,7 @@ test('sum', function () {
 });
 ```
 
-You can find the full documentation for PHPUnit's assertion API on the PHPUnit website: [docs.phpunit.de/en/10.0/assertions.html](https://docs.phpunit.de/en/10.0/assertions.html)
+You can find the full documentation for PHPUnit's assertion API on the PHPUnit website: [docs.phpunit.de/en/10.5/assertions.html](https://docs.phpunit.de/en/10.5/assertions.html)
 
 ---