diff --git a/debian/copyright b/debian/copyright
index 0cce8fd..e0ac93f 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: commons-java
 Upstream-Contact: TiongHiang Lee (thlee@onemindsoft.org)
 Source: http://onemind-commons.sourceforge.net/commons-java/