diff --git a/Dockerfile b/Dockerfile
index 84dcd52..81bc577 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,3 +3,4 @@ FROM sharelatex/sharelatex:2.0.0
 RUN tlmgr install collection-latexrecommended
 RUN tlmgr install collection-fontsrecommended
 RUN tlmgr install fontawesome
+RUN tlmgr install pgf-umlsd