diff --git a/debian/changelog b/debian/changelog
index 77a2af5..a475b8b 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,9 @@
+gbdfed (1.6-5) UNRELEASED; urgency=medium
+
+  * d/copyright: Use https protocol in Format field
+
+ -- Ondřej Nový <onovy@debian.org>  Mon, 01 Oct 2018 09:57:51 +0200
+
 gbdfed (1.6-4) unstable; urgency=medium
 
   * Drop custom debian/rules.
diff --git a/debian/copyright b/debian/copyright
index 38919bc..d6e1834 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/
 Upstream-Name: gbdfed
 Upstream-Contact: Mark Leisher <mleisher@gmail.com>
 Source: http://www.math.nmsu.edu/~mleisher/Software/gbdfed/