diff --git a/Dockerfile b/Dockerfile
index c3d858b..105581b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -4,7 +4,7 @@ WORKDIR /app
 COPY blogue blogue
 COPY nuir nuir
 
-RUN pip3 install "pelican[markdown]" pelican-series pelican-drafts
+RUN pip3 install "pelican[markdown]" pelican-series pelican-drafts plantuml-markdown
 RUN pelican blogue/content -s blogue/pelicanconf.py
 
 FROM nginx:alpine