diff --git a/Dockerfile b/Dockerfile
index 15dfb0e..04e3df8 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -14,6 +14,7 @@ RUN mkdir /usr/local/structurizr && \
     unzip /usr/local/structurizr/structurizr-cli.zip -d /usr/local/structurizr
 
 RUN apk add --no-cache nodejs npm
+RUN npm install -g @mermaid-js/mermaid-cli
 
 USER dtcuser
 ENV DIAGRAM_STRUCTURIZRCLI_HOME=/usr/local/structurizr