diff --git a/tools/plantuml/Dockerfile b/tools/plantuml/Dockerfile
index cef2c7c..54d61ee 100644
--- a/tools/plantuml/Dockerfile
+++ b/tools/plantuml/Dockerfile
@@ -1,5 +1,5 @@
 
-FROM openjdk:17-jdk-alpine
+FROM openjdk:18-jdk-alpine
 
 ARG PLANTUML_VERSION=1.2021.5