diff --git a/debian/copyright b/debian/copyright
index 77c7014a4..118041ca4 100644
--- a/debian/copyright
+++ b/debian/copyright
@@ -1,4 +1,4 @@
-Format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
+Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
 Source: https://salsa.debian.org/freedombox-team/plinth
 Upstream-Name: Plinth
 Files-Excluded: plinth/modules/jsxc/static/img plinth/modules/jsxc/static/libjs-jsxc/*