diff --git a/debian/compat b/debian/compat
deleted file mode 100644
index ec63514..0000000
--- a/debian/compat
+++ /dev/null
@@ -1 +0,0 @@
-9
diff --git a/debian/control b/debian/control
index 5e309b7..1b40ec5 100644
--- a/debian/control
+++ b/debian/control
@@ -1,10 +1,10 @@
 Source: twofi
 Section: misc
-Priority: extra
+Priority: optional
 Maintainer: Kali Developers <devel@kali.org>
-Build-Depends: debhelper (>= 9)
-Standards-Version: 3.9.5
-Homepage: http://www.digininja.org/projects/twofi.php
+Build-Depends: debhelper-compat (= 13)
+Standards-Version: 4.5.1
+Homepage: https://www.digininja.org/projects/twofi.php
 Vcs-Git: https://gitlab.com/kalilinux/packages/twofi.git
 Vcs-Browser: https://gitlab.com/kalilinux/packages/twofi
 
diff --git a/debian/copyright b/debian/copyright
index aeefc4f..1b4e996 100644
--- a/debian/copyright
+++ b/debian/copyright
@@ -1,6 +1,6 @@
-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: twofi
-Source: http://www.digininja.org/projects/twofi.php
+Source: https://www.digininja.org/projects/twofi.php
 
 Files: *
 Copyright: 2012 Robin Wood <robin@digininja.org>
diff --git a/debian/watch b/debian/watch
index 60bb71c..de489a8 100644
--- a/debian/watch
+++ b/debian/watch
@@ -1,3 +1,3 @@
-version=3
+version=4
 
-http://www.digininja.org/projects/twofi.php  /files/twofi_([\d\.]+)\.(?:tgz|tbz2|txz|tar\.gz|tar\.bz2|tar\.xz|sh)
+https://www.digininja.org/projects/twofi.php  /files/twofi_([\d\.]+)\.(?:tgz|tbz2|txz|tar\.gz|tar\.bz2|tar\.xz|sh)