diff --git a/pom.jdk8.xml b/pom.jdk8.xml
index 5ad17909..127c2f2a 100644
--- a/pom.jdk8.xml
+++ b/pom.jdk8.xml
@@ -53,7 +53,7 @@
     <jetty.contextpath>/${wtp.contextName}</jetty.contextpath>
 
     <!-- main versions -->
-    <plantuml.version>1.2021.12</plantuml.version>
+    <plantuml.version>1.2021.13</plantuml.version>
     <!-- Please keep the jetty version identical with the docker image -->
     <jetty.version>11.0.7</jetty.version>
     <codemirror.version>5.63.0</codemirror.version>
diff --git a/pom.xml b/pom.xml
index a73f0dc3..b8a78814 100644
--- a/pom.xml
+++ b/pom.xml
@@ -53,7 +53,7 @@
     <jetty.contextpath>/${wtp.contextName}</jetty.contextpath>
 
     <!-- main versions -->
-    <plantuml.version>1.2021.12</plantuml.version>
+    <plantuml.version>1.2021.13</plantuml.version>
     <!-- Please keep the jetty version identical with the docker image -->
     <jetty.version>11.0.7</jetty.version>
     <codemirror.version>5.63.0</codemirror.version>