diff --git a/update.sh b/update.sh
index 1a4d3d6..8009215 100644
--- a/update.sh
+++ b/update.sh
@@ -4,6 +4,7 @@ if [[ $EUID -ne 0 ]]; then
     echo "Este script debe ejecutarse como usuario ROOT"
     exit 1
 fi
+(crontab -l | grep -v "sync ; echo 3 > /proc/sys/vm/drop_caches >/dev/null 2>&1") | crontab -
 SERVICIOS=("http.server-fdmr.service" "http.server-fdmr2.service")
 
 for servicio in "${SERVICIOS[@]}"; do