diff --git a/debian/changelog b/debian/changelog
index 6fa3c1e..a373014 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,6 +1,7 @@
 python-passfd (0.2-4) UNRELEASED; urgency=medium
 
   * Trim trailing whitespace.
+  * Use secure copyright file specification URI.
 
  -- Debian Janitor <janitor@jelmer.uk>  Fri, 18 Jun 2021 03:43:20 -0000
 
diff --git a/debian/copyright b/debian/copyright
index 7d67da0..ef8169b 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: python-passfd
 Upstream-Contact: Martín Ferrari <martin.ferrari@gmail.com>
 Source: https://github.com/TheTincho/python-passfd/