diff --git a/Dockerfile b/Dockerfile
index 66cf8cb..53bcfc3 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -63,7 +63,7 @@ RUN mkdir -p /home/node/log \
 && mkdir -p  /home/node/crond \
 && mkdir -p  /home/node/run \
 && mkdir -p /run/nginx \
-&& npm install pm2@latest express -g  \
+&& npm install pm2@latest -g  \
 && chmod -R 755 /home/node \
 && chmod +x /usr/local/bin/mpi_bootstrap \
 && chmod +x /home/node/startup.sh \
diff --git a/startup.sh b/startup.sh
index 25e2142..5342fb6 100644
--- a/startup.sh
+++ b/startup.sh
@@ -78,7 +78,7 @@ chmod +x /home/$USER/crond/playground-sync.sh
 read -r -d '' VAR <<EOF
 #!/bin/bash
 
-su -c 'cd /home/$USER/$REPO/swarmlab-app/src; npm install; npm cache clean --force;' - node
+su -c 'cd /home/$USER/$REPO/swarmlab-app/src; npm install; npm install express --save; npm cache clean --force;' - node
 su -c 'pm2-runtime /home/$USER/crond/playground.config.js' - node