diff --git a/usr/local/share/bastille/upgrade.sh b/usr/local/share/bastille/upgrade.sh
index 165e936d..915f804d 100644
--- a/usr/local/share/bastille/upgrade.sh
+++ b/usr/local/share/bastille/upgrade.sh
@@ -170,8 +170,8 @@ jail_upgrade() {
         local _newrelease="${NEWRELEASE}"
         # Update "osrelease" entry inside fstab
         sed -i '' "/.bastille/ s|${_oldrelease}|${_newrelease}|g" "${bastille_jailsdir}/${_jailname}/fstab"
-        # Update "osrelease" inside jail.conf
-        sed -i '' "/osrelease/ s|${_oldrelease}|${_newrelease}|g" "${bastille_jailsdir}/${_jailname}/jail.conf"
+        # Update "osrelease" inside jail.conf using 'bastille config'
+        bastille config ${_jailname} set osrelease ${_newrelease}
         # Start jail if AUTO=1
         if [ "${AUTO}" -eq 1 ]; then
             bastille start "${_jailname}"
@@ -187,8 +187,8 @@ jail_upgrade() {
         -f "${_freebsd_update_conf}" \
         -r "${_newrelease}" upgrade
         
-        # Update "osrelease" entry inside jail.conf
-        sed -i '' "/osrelease/ s|${_oldrelease}|${_newrelease}|g" "${bastille_jailsdir}/${_jailname}/jail.conf"
+        # Update "osrelease" inside jail.conf using 'bastille config'
+        bastille config ${_jailname} set osrelease ${_newrelease}
         warn "Please run 'bastille upgrade ${_jailname} install', restart the jail, then run 'bastille upgrade ${_jailname} install' again to finish installing updates."
     fi
 }