diff --git a/debian/changelog b/debian/changelog
index d71070b..38ed1f8 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,9 @@
+ohcount (4.0.0-2) UNRELEASED; urgency=medium
+
+  * Bump debhelper from old 9 to 12.
+
+ -- Debian Janitor <janitor@jelmer.uk>  Thu, 21 Nov 2019 03:29:25 +0000
+
 ohcount (4.0.0-1) unstable; urgency=medium
 
   * Upload to unstable
diff --git a/debian/compat b/debian/compat
index ec63514..48082f7 100644
--- a/debian/compat
+++ b/debian/compat
@@ -1 +1 @@
-9
+12
diff --git a/debian/control b/debian/control
index c2165f8..d668875 100644
--- a/debian/control
+++ b/debian/control
@@ -2,7 +2,7 @@
 Section: utils
 Priority: optional
 Maintainer: Sylvestre Ledru <sylvestre@debian.org>
-Build-Depends: debhelper (>= 9), libpcre3-dev, gem2deb, rake,
+Build-Depends: debhelper (>= 12~), libpcre3-dev, gem2deb, rake,
  ragel (>= 6.3), ruby-diff-lcs, doxygen, gperf, file, libmagic-dev,
  swig
 Standards-Version: 4.1.3