diff --git a/pom.xml b/pom.xml
index 6609fd14..26d55bcc 100644
--- a/pom.xml
+++ b/pom.xml
@@ -236,7 +236,7 @@
       <plugin>
         <groupId>com.helger.maven</groupId>
         <artifactId>ph-schematron-maven-plugin</artifactId>
-        <version>6.3.3</version>
+        <version>9.1.1</version>
         <executions>
           <execution>
             <goals>