diff --git a/tasks/configure_package_repositories.yml b/tasks/configure_package_repositories.yml
index f13eb07a4be99bfa0a5ce244ceb869f0c3d27cef..2d19cf5aed21485b4a973d3291360466aeb3c54b 100644
--- a/tasks/configure_package_repositories.yml
+++ b/tasks/configure_package_repositories.yml
@@ -28,7 +28,7 @@
       gpgkey: "https://dl.fedoraproject.org/pub/epel/RPM-GPG-KEY-EPEL-{{ ansible_distribution_major_version }}"
     - name: "slub"
       description: SLUB YUM repo
-      baseurl: "http://sdvrhelrepo.slub-dresden.de/"
+      baseurl: "https://sdvrhelrepo.slub-dresden.de/"
       gpgcheck: "false"
   when: ansible_os_family == "RedHat"