diff --git a/centos-7.9-python3/Dockerfile b/centos-7.9-python3/Dockerfile
index c08c7b9..dbda322 100644
--- a/centos-7.9-python3/Dockerfile
+++ b/centos-7.9-python3/Dockerfile
@@ -1,5 +1,9 @@
 FROM centos:7.9.2009
 RUN useradd -ms /bin/bash easybuild
+# mirrorlist.centos.org doesn't exists anymore, update repo files
+RUN sed -i s/mirror.centos.org/vault.centos.org/g /etc/yum.repos.d/CentOS-*.repo \
+  && sed -i s/^#.*baseurl=http/baseurl=http/g /etc/yum.repos.d/CentOS-*.repo \
+  && sed -i s/^mirrorlist=http/#mirrorlist=http/g /etc/yum.repos.d/CentOS-*.repo
 RUN yum -y install epel-release && yum -y install python3 python3-pip Lmod
 RUN yum -y install bzip2 curl diffutils file gcc-c++ git gzip make openssl openssl-devel rdma-core-devel patch sudo tar unzip which xz
 RUN yum -y update ca-certificates
diff --git a/centos-7.9/Dockerfile b/centos-7.9/Dockerfile
index ea82f9d..42faa46 100644
--- a/centos-7.9/Dockerfile
+++ b/centos-7.9/Dockerfile
@@ -1,5 +1,9 @@
 FROM centos:7.9.2009
 RUN useradd -ms /bin/bash easybuild
+# mirrorlist.centos.org doesn't exists anymore, update repo files
+RUN sed -i s/mirror.centos.org/vault.centos.org/g /etc/yum.repos.d/CentOS-*.repo \
+  && sed -i s/^#.*baseurl=http/baseurl=http/g /etc/yum.repos.d/CentOS-*.repo \
+  && sed -i s/^mirrorlist=http/#mirrorlist=http/g /etc/yum.repos.d/CentOS-*.repo
 RUN yum -y install epel-release && yum -y install python python2-pip Lmod
 RUN yum -y install bzip2 curl diffutils file gcc-c++ git gzip make openssl openssl-devel rdma-core-devel patch sudo tar unzip which xz
 RUN yum -y update ca-certificates