diff --git a/Dockerfile b/Dockerfile
index 5a6b995..ab2e808 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -17,7 +17,7 @@ FROM python:3.8-alpine
 RUN apk update && apk --no-cache add gcc musl-dev openjdk17-jdk curl graphviz ttf-dejavu fontconfig
 
 # Download plantuml file, Validate checksum & Move plantuml file
-RUN curl -o plantuml.jar -L http://sourceforge.net/projects/plantuml/files/plantuml.1.2022.4.jar/download && echo "246d1ed561ebbcac14b2798b45712a9d018024c0  plantuml.jar" | sha1sum -c - && mv plantuml.jar /opt/plantuml.jar
+RUN curl -o plantuml.jar -L https://sourceforge.net/projects/plantuml/files/1.2023.7/plantuml.1.2023.7.jar/download && echo "93fe1101c59381e0b3af86262b844871ca0eb987  plantuml.jar" | sha1sum -c - && mv plantuml.jar /opt/plantuml.jar
 
 RUN pip install --upgrade pip && pip install mkdocs-techdocs-core==1.2.1