diff --git a/vars/debian-10.yml b/vars/debian-10.yml
index f823408e9..9c82440f6 100644
--- a/vars/debian-10.yml
+++ b/vars/debian-10.yml
@@ -25,5 +25,5 @@ php_version: 7.3
 postgresql_version: 11
 systemd_location: /lib/systemd/system
 # Upgrade OS's own Calibre to very latest:
-calibre_via_debs: True
-calibre_via_python: False
+calibre_via_debs: False
+calibre_via_python: True