diff --git a/psalm-baseline.xml b/psalm-baseline.xml
index dbe0391..e4ea4b9 100644
--- a/psalm-baseline.xml
+++ b/psalm-baseline.xml
@@ -34,15 +34,9 @@
     <MixedReturnStatement>
       <code><![CDATA[$this->problemStatusTitles[$this->status]]]></code>
     </MixedReturnStatement>
-    <PossiblyNullPropertyAssignmentValue>
-      <code>$title</code>
-    </PossiblyNullPropertyAssignmentValue>
     <RedundantCastGivenDocblockType>
       <code>(bool) $flag</code>
     </RedundantCastGivenDocblockType>
-    <RedundantConditionGivenDocblockType>
-      <code><![CDATA[null !== $this->title]]></code>
-    </RedundantConditionGivenDocblockType>
     <RiskyTruthyFalsyComparison>
       <code>$status</code>
     </RiskyTruthyFalsyComparison>
@@ -326,17 +320,6 @@
   </file>
   <file src="test/Listener/RenderErrorListenerTest.php">
     <MixedArgument>
-      <code>$content</code>
-      <code>$content</code>
-      <code>$content</code>
-      <code>$content</code>
-      <code>$content</code>
-      <code>$content</code>
-      <code>$content</code>
-      <code>$content</code>
-      <code>$content</code>
-      <code>$content</code>
-      <code>$content</code>
       <code>$content</code>
       <code>$content</code>
       <code>$content</code>
@@ -348,22 +331,6 @@
       <code><![CDATA[$response->getContent()]]></code>
       <code><![CDATA[$response->getContent()]]></code>
     </MixedArgument>
-    <MixedArrayAccess>
-      <code><![CDATA[$content['describedBy']]]></code>
-      <code><![CDATA[$content['describedBy']]]></code>
-      <code><![CDATA[$content['describedBy']]]></code>
-      <code><![CDATA[$content['detail']]]></code>
-      <code><![CDATA[$content['detail']]]></code>
-      <code><![CDATA[$content['detail']]]></code>
-      <code><![CDATA[$content['details']]]></code>
-      <code><![CDATA[$content['details']]]></code>
-      <code><![CDATA[$content['status']]]></code>
-      <code><![CDATA[$content['status']]]></code>
-      <code><![CDATA[$content['status']]]></code>
-      <code><![CDATA[$content['title']]]></code>
-      <code><![CDATA[$content['title']]]></code>
-      <code><![CDATA[$content['title']]]></code>
-    </MixedArrayAccess>
     <MixedAssignment>
       <code>$content</code>
       <code>$content</code>
@@ -395,7 +362,6 @@
     <MixedArrayAccess>
       <code><![CDATA[$data['detail']]]></code>
       <code><![CDATA[$data['detail']]]></code>
-      <code><![CDATA[$data['trace']]]></code>
     </MixedArrayAccess>
     <MixedAssignment>
       <code>$data</code>
@@ -403,6 +369,10 @@
     </MixedAssignment>
   </file>
   <file src="test/ModuleTest.php">
+    <DeprecatedMethod>
+      <code>getMockForAbstractClass</code>
+      <code>returnCallback</code>
+    </DeprecatedMethod>
     <UndefinedMethod>
       <code>setSharedManager</code>
     </UndefinedMethod>
@@ -411,9 +381,6 @@
     <MixedArgument>
       <code>$test</code>
     </MixedArgument>
-    <MixedArrayAccess>
-      <code><![CDATA[$test['trace']]]></code>
-    </MixedArrayAccess>
     <MixedAssignment>
       <code>$test</code>
     </MixedAssignment>
diff --git a/src/ApiProblem.php b/src/ApiProblem.php
index 5c281f9..19d3488 100644
--- a/src/ApiProblem.php
+++ b/src/ApiProblem.php
@@ -68,8 +68,10 @@ class ApiProblem
 
     /**
      * Normalized property names for overloading.
+     *
+     * @var array
      */
-    protected array $normalizedProperties = [
+    protected $normalizedProperties = [
         'type'   => 'type',
         'status' => 'status',
         'title'  => 'title',
@@ -78,8 +80,10 @@ class ApiProblem
 
     /**
      * Status titles for common problems.
+     *
+     * @var array
      */
-    protected array $problemStatusTitles = [
+    protected $problemStatusTitles = [
         // CLIENT ERROR
         400 => 'Bad Request',
         401 => 'Unauthorized',