diff --git a/pom.xml b/pom.xml
index ca74510..df6a52a 100644
--- a/pom.xml
+++ b/pom.xml
@@ -179,7 +179,7 @@
     <dependency>
       <groupId>net.sourceforge.plantuml</groupId>
       <artifactId>plantuml</artifactId>
-      <version>1.2021.8</version>
+      <version>1.2021.9</version>
     </dependency>
     <dependency>
       <groupId>javax.servlet</groupId>