diff --git a/debian/changelog b/debian/changelog
index 424c09d..9cae34c 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,6 +1,7 @@
 findbugs (3.1.0~preview2-4) UNRELEASED; urgency=medium
 
   * Trim trailing whitespace.
+  * Use secure copyright file specification URI.
 
  -- Debian Janitor <janitor@jelmer.uk>  Sat, 15 May 2021 12:18:47 -0000
 
diff --git a/debian/copyright b/debian/copyright
index 3c59447..7c07419 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: FindBugs
 Source: https://github.com/findbugsproject/findbugs