diff --git a/psalm.xml b/psalm.xml
index 015c0ed18b..3fb9414569 100644
--- a/psalm.xml
+++ b/psalm.xml
@@ -27,5 +27,13 @@
                 <referencedClass name="UnitEnum"/>
             </errorLevel>
         </UndefinedClass>
+        <UndefinedDocblockClass>
+            <errorLevel type="suppress">
+                <!-- These classes have been added in PHP 8.1 -->
+                <referencedClass name="BackedEnum"/>
+                <referencedClass name="ReflectionIntersectionType"/>
+                <referencedClass name="UnitEnum"/>
+            </errorLevel>
+        </UndefinedDocblockClass>
     </issueHandlers>
 </psalm>