diff --git a/composer.json b/composer.json
index b102c10..f756523 100644
--- a/composer.json
+++ b/composer.json
@@ -16,7 +16,7 @@
     "require": {
         "php": "^8.4",
         "doctrine/coding-standard": "^14",
-        "slevomat/coding-standard": "^8.30",
+        "slevomat/coding-standard": "^8.31",
         "squizlabs/php_codesniffer": "^4.0.4"
     },
     "require-dev": {
diff --git a/src/Cdn77/ruleset.xml b/src/Cdn77/ruleset.xml
index 5fdd2bd..67dcca6 100644
--- a/src/Cdn77/ruleset.xml
+++ b/src/Cdn77/ruleset.xml
@@ -43,6 +43,27 @@
         <exclude name="SlevomatCodingStandard.TypeHints.ReturnTypeHint.MissingTraversableTypeHintSpecification" />
     </rule>
 
+    <!-- Backport Doctrine 15.0.x rules while Cdn77 is based on Doctrine 14. -->
+    <rule ref="SlevomatCodingStandard.Classes.ClassKeywordOrder"/>
+    <rule ref="SlevomatCodingStandard.Classes.TraitUseOrder"/>
+    <rule ref="SlevomatCodingStandard.Commenting.RequireOneDocComment"/>
+    <rule ref="SlevomatCodingStandard.ControlStructures.EarlyExit">
+        <properties>
+            <property name="ignoreTrailingIfWithOneInstruction" value="true"/>
+        </properties>
+    </rule>
+    <rule ref="SlevomatCodingStandard.Exceptions.CatchExceptionsOrder"/>
+    <rule ref="SlevomatCodingStandard.PHP.UselessParentheses">
+        <properties>
+            <property name="enableCheckAroundNew" value="true"/>
+        </properties>
+    </rule>
+    <rule ref="SlevomatCodingStandard.TypeHints.DNFTypeHintFormat">
+        <properties>
+            <property name="enableForDocComments" value="true"/>
+        </properties>
+    </rule>
+
     <rule ref="SlevomatCodingStandard.Classes.ClassStructure">
         <properties>
             <property name="groups" type="array">