diff --git a/debian/changelog b/debian/changelog
index 660a39ef7d26aa5a11dcfefe4e1137c52a33bc33..ca5844f98ff12110d89937cdb8c7a9f70ef6eaaf 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,6 +1,10 @@
 dgit (9.14~) unstable; urgency=medium
 
   * 
+  * Bump debhelper from deprecated 9 to 12.
+  * Set debhelper-compat version in Build-Depends.
+  * Update renamed lintian tag names in lintian overrides.
+  * Remove unnecessary 'Testsuite: autopkgtest' header.
 
  --
 
diff --git a/debian/compat b/debian/compat
deleted file mode 100644
index ec635144f60048986bc560c5576355344005e6e7..0000000000000000000000000000000000000000
--- a/debian/compat
+++ /dev/null
@@ -1 +0,0 @@
-9
diff --git a/debian/control b/debian/control
index 210c5b73e3e97cf6b4aa0389990cde449c92eaaa..fd3d182a263ef64980032eefe12e6abe318b799e 100644
--- a/debian/control
+++ b/debian/control
@@ -3,8 +3,7 @@ Section: devel
 Priority: optional
 Maintainer: Ian Jackson <ijackson@chiark.greenend.org.uk>
 Standards-Version: 4.4.0.0
-Build-Depends: debhelper (>= 9), gettext, po4a, tcl
-Testsuite: autopkgtest
+Build-Depends: debhelper-compat (= 12), gettext, po4a, tcl
 Vcs-Git: https://salsa.debian.org/dgit-team/dgit.git
 Vcs-Browser: https://salsa.debian.org/dgit-team/dgit
 
diff --git a/debian/dgit.lintian-overrides b/debian/dgit.lintian-overrides
index 2f7a9686efa44fcdcfb4ae749ef6982083dc6e00..35b2eae08c8845e2b84e688dbf7c809370fcde02 100644
--- a/debian/dgit.lintian-overrides
+++ b/debian/dgit.lintian-overrides
@@ -1,2 +1,2 @@
-manpage-has-errors-from-man usr/share/man/man1/dgit.1.gz file '<standard input>', around line 51:
-binary-without-manpage usr/bin/dgit-badcommit-fixup
+groff-message usr/share/man/man1/dgit.1.gz file '<standard input>', around line 51:
+no-manual-page usr/bin/dgit-badcommit-fixup
diff --git a/debian/source/lintian-overrides b/debian/source/lintian-overrides
index 26924a196190e70d07564e79df20af456bb46709..b323a845fd66120be551f16659a9fe87bb608646 100644
--- a/debian/source/lintian-overrides
+++ b/debian/source/lintian-overrides
@@ -1,4 +1,4 @@
-file-contains-trailing-whitespace debian/changelog *
+trailing-whitespace debian/changelog *
 unknown-runtime-tests-restriction x-dgit-*
 missing-debian-source-format
 older-source-format 1.0