diff --git a/update.sh b/update.sh
index 8aa9cad..0f870cf 100644
--- a/update.sh
+++ b/update.sh
@@ -87,6 +87,8 @@ elif [ ${OS} == 'CentOS' ]; then
     # Centos 7 
     if [[ ${OS_VER} =~ ^8.* ]]; then
    		# install the packages
+        # libnsl is needed for pbis and needs to be installed already
+        dnf install -y libnsl
       	dnf install -y libnsl pbis-open sudo nano htop iperf3 bind-utils open-vm-tools unzip nfs-utils git wget net-tools make
         # https://github.com/BeyondTrust/pbis-open/issues/242
         cp /opt/pbis/share/rhel/8.0/pbis.pp /opt/pbis/share/