diff --git a/src/PhpInfo.php b/src/PhpInfo.php
index 4f95d2b..d6f9688 100644
--- a/src/PhpInfo.php
+++ b/src/PhpInfo.php
@@ -11,7 +11,7 @@
 use function str_replace;
 use const INFO_ALL;
 
-class PhpInfo
+final class PhpInfo
 {
 
 	private SensitiveValueSanitizer $sanitizer;
diff --git a/src/SensitiveValueSanitizer.php b/src/SensitiveValueSanitizer.php
index f16aa9b..73ff419 100644
--- a/src/SensitiveValueSanitizer.php
+++ b/src/SensitiveValueSanitizer.php
@@ -9,7 +9,7 @@
 use function strtr;
 use function urlencode;
 
-class SensitiveValueSanitizer
+final class SensitiveValueSanitizer
 {
 
 	private bool $sanitizeSessionId = true;