diff --git a/Dockerfile b/Dockerfile
index 53a8783..6cebca8 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -17,4 +17,4 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
   && rm -rf /var/lib/apt/lists/* \
   && mkdir -p /var/lib/shiny-server/bookmarks/shiny
 
-RUN install2.r ggplot2 jpeg png stringr gridExtra grid
+RUN install2.r ggplot2 jpeg png stringr gridExtra grid testthat