diff --git a/debian/copyright b/debian/copyright
index 8406317..1e35e8b 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: XStream
 Source: https://github.com/x-stream/xstream