diff --git a/debian/copyright b/debian/copyright
index 42fc714..310fc5f 100644
--- a/debian/copyright
+++ b/debian/copyright
@@ -71,9 +71,9 @@
     returns MP_YES if it is a strong L-S prime, MP_NO if it is composite
  .
     Code ported from  Thomas Ray Nicely's implementation of the BPSW test
-    at http://www.trnicely.net/misc/bpsw.html
+    at https://www.trnicely.net/misc/bpsw.html
  .
-    Freeware copyright (C) 2016 Thomas R. Nicely <http://www.trnicely.net>.
+    Freeware copyright (C) 2016 Thomas R. Nicely <https://www.trnicely.net>.
     Released into the public domain by the author, who disclaims any legal
     liability arising from its use
  .