diff -Nru grfcodec-6.0.6/debian/changelog grfcodec-6.0.6/debian/changelog
--- grfcodec-6.0.6/debian/changelog	2016-07-03 09:02:46.000000000 +0000
+++ grfcodec-6.0.6/debian/changelog	2018-05-10 19:42:34.000000000 +0000
@@ -1,3 +1,12 @@
+grfcodec (6.0.6-2) unstable; urgency=medium
+
+  * [4dce67c] Bump debhelper version to v11
+  * [eca5421] Bump standards version to 4.1.4
+  * [8d4f2a1] Convert Priority: extra to optional
+  * [cda4980] Mark as Multi-arch: foreign
+
+ -- Matthijs Kooijman <matthijs@stdin.nl>  Thu, 10 May 2018 21:42:34 +0200
+
 grfcodec (6.0.6-1) unstable; urgency=medium
 
   * [dd04bd9] New upstream release 6.0.6.
diff -Nru grfcodec-6.0.6/debian/compat grfcodec-6.0.6/debian/compat
--- grfcodec-6.0.6/debian/compat	2016-07-03 09:02:46.000000000 +0000
+++ grfcodec-6.0.6/debian/compat	2018-05-10 19:42:34.000000000 +0000
@@ -1 +1 @@
-9
+11
diff -Nru grfcodec-6.0.6/debian/control grfcodec-6.0.6/debian/control
--- grfcodec-6.0.6/debian/control	2016-07-03 09:02:46.000000000 +0000
+++ grfcodec-6.0.6/debian/control	2018-05-10 19:42:34.000000000 +0000
@@ -1,12 +1,13 @@
 Source: grfcodec
 Section: devel
-Priority: extra
+Priority: optional
 Maintainer: Matthijs Kooijman <matthijs@stdin.nl>
 Uploaders: Jordi Mallach <jordi@debian.org>
-Build-Depends: debhelper (>= 9), libboost-dev, libpng-dev, dpkg-dev (>=1.16.1)
-Standards-Version: 3.9.6
-Vcs-Browser: http://anonscm.debian.org/gitweb/?p=collab-maint/grfcodec.git
-Vcs-Git: git://anonscm.debian.org/collab-maint/grfcodec.git
+Build-Depends: debhelper (>= 11), libboost-dev, libpng-dev, dpkg-dev (>=1.16.1)
+Standards-Version: 4.1.4
+Multi-Arch: foreign
+Vcs-Browser: https://salsa.debian.org/openttd-team/grfcodec
+Vcs-Git: https://salsa.debian.org/openttd-team/grfcodec.git
 Homepage: http://dev.openttdcoop.org/projects/grfcodec
 
 Package: grfcodec
diff -Nru grfcodec-6.0.6/debian/copyright grfcodec-6.0.6/debian/copyright
--- grfcodec-6.0.6/debian/copyright	2016-07-03 09:02:46.000000000 +0000
+++ grfcodec-6.0.6/debian/copyright	2018-05-10 19:42:34.000000000 +0000
@@ -1,7 +1,7 @@
-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: GRFCodec
-Upstream-Contact: http://dev.openttdcoop.org/projects/grfcodec
-Source: http://dev.openttdcoop.org/projects/grfcodec
+Upstream-Contact: https://dev.openttdcoop.org/projects/grfcodec
+Source: https://dev.openttdcoop.org/projects/grfcodec
 
 
 Files: *
diff -Nru grfcodec-6.0.6/debian/watch grfcodec-6.0.6/debian/watch
--- grfcodec-6.0.6/debian/watch	2016-07-03 09:02:46.000000000 +0000
+++ grfcodec-6.0.6/debian/watch	2018-05-10 19:42:34.000000000 +0000
@@ -3,4 +3,4 @@
 # Compulsory line, this is a version 3 file
 version=3
 
-http://www.openttd.org/en/download-grfcodec .*/grfcodec-(\d.*)-source\.(?:tgz|tbz2|txz|tar\.(?:gz|bz2|xz))
+https://www.openttd.org/en/download-grfcodec .*/grfcodec-(\d.*)-source\.(?:tgz|tbz2|txz|tar\.(?:gz|bz2|xz))