diff --git a/runon.conf b/runon.conf
index 642a27d..5ebb8e5 100644
--- a/runon.conf
+++ b/runon.conf
@@ -27,6 +27,8 @@ packages = ksh csh xterm xorg-x11-apps xkeyboard-config git glibc-devel gtk2 gtk
 [centos8]
 dockerfile =
 	  FROM centos:8
+    RUN sed -i 's/mirrorlist/#mirrorlist/g' /etc/yum.repos.d/CentOS-*
+    RUN sed -i 's|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g' /etc/yum.repos.d/CentOS-*
     RUN yum install dnf-plugins-core -y
     RUN yum config-manager --set-enabled powertools -y
     RUN yum install sudo -y