diff --git a/debian/changelog b/debian/changelog
index e0a5646..3b6866c 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,6 +1,7 @@
 zram-tools (0.3.2.1-2) UNRELEASED; urgency=medium
 
   * Trim trailing whitespace.
+  * Use secure copyright file specification URI.
 
  -- Debian Janitor <janitor@jelmer.uk>  Thu, 17 Jun 2021 20:11:17 -0000
 
diff --git a/debian/copyright b/debian/copyright
index 28bfc82..3f45702 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: zram-tools
 Source: https://salsa.debian.org/jcc/zram-tools