diff --git a/system/Log/Handlers/ChromeLoggerHandler.php b/system/Log/Handlers/ChromeLoggerHandler.php
index eedea60a1558..5813f338b389 100644
--- a/system/Log/Handlers/ChromeLoggerHandler.php
+++ b/system/Log/Handlers/ChromeLoggerHandler.php
@@ -151,6 +151,8 @@ protected function format($object)
     /**
      * Attaches the header and the content to the passed in request object.
      *
+     * @param-out ResponseInterface $response
+     *
      * @return void
      */
     public function sendLogs(?ResponseInterface &$response = null)
diff --git a/tests/_support/Validation/TestRules.php b/tests/_support/Validation/TestRules.php
index 41f765fe14a7..cb6cde9d4584 100644
--- a/tests/_support/Validation/TestRules.php
+++ b/tests/_support/Validation/TestRules.php
@@ -15,6 +15,9 @@
 
 class TestRules
 {
+    /**
+     * @param-out string $error
+     */
     public function customError(string $str, ?string &$error = null)
     {
         $error = 'My lovely error';
diff --git a/utils/phpstan-baseline/loader.neon b/utils/phpstan-baseline/loader.neon
index 9cac99c53599..a2989fec1d0d 100644
--- a/utils/phpstan-baseline/loader.neon
+++ b/utils/phpstan-baseline/loader.neon
@@ -25,7 +25,6 @@ includes:
     - notIdentical.alwaysTrue.neon
     - nullCoalesce.property.neon
     - nullCoalesce.variable.neon
-    - parameterByRef.unusedType.neon
     - property.defaultValue.neon
     - property.nonObject.neon
     - property.notFound.neon
diff --git a/utils/phpstan-baseline/parameterByRef.unusedType.neon b/utils/phpstan-baseline/parameterByRef.unusedType.neon
deleted file mode 100644
index a750c89a492e..000000000000
--- a/utils/phpstan-baseline/parameterByRef.unusedType.neon
+++ /dev/null
@@ -1,13 +0,0 @@
-# total 2 errors
-
-parameters:
-    ignoreErrors:
-        -
-            message: '#^Method CodeIgniter\\Log\\Handlers\\ChromeLoggerHandler\:\:sendLogs\(\) never assigns null to &\$response so it can be removed from the by\-ref type\.$#'
-            count: 1
-            path: ../../system/Log/Handlers/ChromeLoggerHandler.php
-
-        -
-            message: '#^Method Tests\\Support\\Validation\\TestRules\:\:customError\(\) never assigns null to &\$error so it can be removed from the by\-ref type\.$#'
-            count: 1
-            path: ../../tests/_support/Validation/TestRules.php