diff --git a/action.yml b/action.yml
index e2c8a07..ba79623 100644
--- a/action.yml
+++ b/action.yml
@@ -14,7 +14,7 @@ inputs:
     default: "**.puml"
 runs:
   using: "docker"
-  image: "docker://plantuml/plantuml:1.2023.2"
+  image: "docker://plantuml/plantuml:1.2023.4"
   args:
     - "-verbose"
     - "-t${{ inputs.format }}"