diff --git a/documentation/build.gradle b/documentation/build.gradle
index 22a0e9a2..6446c32e 100644
--- a/documentation/build.gradle
+++ b/documentation/build.gradle
@@ -21,7 +21,7 @@ dependencies {
 
     javadocClasspath "org.jacoco:org.jacoco.ant:${org.gradle.testing.jacoco.plugins.JacocoPlugin.DEFAULT_JACOCO_VERSION}"
     javadocClasspath "org.apache.maven.plugins:maven-plugin-plugin:3.9.0"
-    javadocClasspath 'net.sourceforge.plantuml:plantuml:1.2023.8'
+    javadocClasspath 'net.sourceforge.plantuml:plantuml:1.2023.9'
 }
 
 tasks.register("docsZip", Zip) {
diff --git a/plantuml-plugin/build.gradle b/plantuml-plugin/build.gradle
index 5530c74b..4236a0e1 100644
--- a/plantuml-plugin/build.gradle
+++ b/plantuml-plugin/build.gradle
@@ -6,9 +6,9 @@ description = "Gradle Plugin for PlantUML"
 
 dependencies {
     //noinspection GradlePackageUpdate
-    compileOnly 'net.sourceforge.plantuml:plantuml:1.2023.8'
+    compileOnly 'net.sourceforge.plantuml:plantuml:1.2023.9'
 
-    testRuntimeOnly 'net.sourceforge.plantuml:plantuml:1.2023.8'
+    testRuntimeOnly 'net.sourceforge.plantuml:plantuml:1.2023.9'
 }
 
 gradlePlugin {