diff --git a/docker/Dockerfile.centos6 b/docker/Dockerfile.centos6
index 2b1081de51..b9323cda28 100644
--- a/docker/Dockerfile.centos6
+++ b/docker/Dockerfile.centos6
@@ -1,7 +1,7 @@
 FROM centos:6.10
 
 # Update as we need to use the vault now.
-RUN sed -i -e 's/^mirrorlist/#mirrorlist/g' -e 's/^#baseurl=http:\/\/mirror.centos.org\/centos\/$releasever\//baseurl=http:\/\/vault.centos.org\/6.10\//g' /etc/yum.repos.d/CentOS-Base.repo
+RUN sed -i -e 's/^mirrorlist/#mirrorlist/g' -e 's/^#baseurl=http:\/\/mirror.centos.org\/centos\/$releasever\//baseurl=https:\/\/vault.centos.org\/6.10\//g' /etc/yum.repos.d/CentOS-Base.repo
 
 # install dependencies
 RUN yum install -y \