diff --git a/doc/source/install/index.rst b/doc/source/install/index.rst
index 9f72253af..451703343 100644
--- a/doc/source/install/index.rst
+++ b/doc/source/install/index.rst
@@ -12,7 +12,7 @@ CoreOS
 ------
 One way to build a ramdisk image for IPA is with the CoreOS image [0]_.
 Prebuilt copies of the CoreOS image, suitable for pxe, are available on
-`tarballs.openstack.org <http://tarballs.openstack.org/ironic-python-agent/coreos/files/>`__.
+`tarballs.openstack.org <https://tarballs.openstack.org/ironic-python-agent/coreos/files/>`__.
 
 Build process
 ~~~~~~~~~~~~~
diff --git a/imagebuild/coreos/README.rst b/imagebuild/coreos/README.rst
index 06f9bd3b0..09867854b 100644
--- a/imagebuild/coreos/README.rst
+++ b/imagebuild/coreos/README.rst
@@ -61,9 +61,9 @@ Download
 
 If you don't want to build your own image, you can download a copy of
 ironic-python-agent ramdisk and kernel, built using CoreOS, at:
-http://tarballs.openstack.org/ironic-python-agent/coreos/files/coreos_production_pxe-master.vmlinuz
+https://tarballs.openstack.org/ironic-python-agent/coreos/files/coreos_production_pxe-master.vmlinuz
 and
-http://tarballs.openstack.org/ironic-python-agent/coreos/files/coreos_production_pxe_image-oem-master.cpio.gz
+https://tarballs.openstack.org/ironic-python-agent/coreos/files/coreos_production_pxe_image-oem-master.cpio.gz
 
 "master" may be replaced with "stable-$branch" (e.g. "stable-mitaka") to
 download an image built from the stable/$branch (e.g. stable/mitaka) version