diff --git a/psc_suite.sh b/psc_suite.sh
index 5e6ae7e..93cf7d2 100644
--- a/psc_suite.sh
+++ b/psc_suite.sh
@@ -57,7 +57,7 @@ touch /data/volumes/psc/watch/upgrade
 touch /data/volumes/psc/watch/update
 chmod -R 0777 /data/volumes/psc/watch
 
-echo '/data/volumes/psc/watch/upgrade IN_MODIFY cd /data/composer/psc && docker-compose pull && docker-compose up -d' >> /etc/incron.d/1-upgrade
+echo '/data/volumes/psc/watch/upgrade IN_MODIFY cd /data/composer/psc && docker system prune -f && docker-compose pull && docker-compose up -d' >> /etc/incron.d/1-upgrade
 echo '/data/volumes/psc/watch/update IN_MODIFY cd /data/composer/psc && docker-compose up -d' >> /etc/incron.d/2-update
 
 curl -L "https://github.com/docker/compose/releases/download/1.28.5/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose