diff --git a/docker/Dockerfile.centos7 b/docker/Dockerfile.centos7
index 168466e..f0b80e0 100644
--- a/docker/Dockerfile.centos7
+++ b/docker/Dockerfile.centos7
@@ -1,7 +1,9 @@
-FROM centos:7
+FROM centos:7.6.1810
 
 ENV SOURCE_DIR /root/source
 
+RUN sed -i -e 's/^mirrorlist/#mirrorlist/g' -e 's/^#baseurl=http:\/\/mirror.centos.org\/centos\/$releasever\//baseurl=https:\/\/vault.centos.org\/\/7.6.1810\//g' /etc/yum.repos.d/CentOS-Base.repo
+
 # install dependencies
 RUN yum install -y \
  bzip2 \