diff --git a/docker/test.Dockerfile b/docker/test.Dockerfile
index af7fd3c..9cb28b8 100644
--- a/docker/test.Dockerfile
+++ b/docker/test.Dockerfile
@@ -17,6 +17,7 @@ VOLUME $HOME
 WORKDIR $HOME
 
 RUN npm install -g npm@latest
+RUN npm install -g @sealcode/sealgen
 
 USER $UID:$GID