diff --git a/debian/changelog b/debian/changelog
index e57aae7..eea2d17 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,9 @@
+ctdconverter (2.1-2) UNRELEASED; urgency=medium
+
+  * Bump debhelper from old 11 to 12.
+
+ -- Debian Janitor <janitor@jelmer.uk>  Fri, 17 Apr 2020 11:23:57 +0000
+
 ctdconverter (2.1-1) unstable; urgency=medium
 
   [ Jelmer Vernooij ]
diff --git a/debian/compat b/debian/compat
index b4de394..48082f7 100644
--- a/debian/compat
+++ b/debian/compat
@@ -1 +1 @@
-11
+12
diff --git a/debian/control b/debian/control
index 8fb3a93..23b531b 100644
--- a/debian/control
+++ b/debian/control
@@ -3,7 +3,7 @@
 Uploaders: Michael R. Crusoe <michael.crusoe@gmail.com>
 Section: science
 Priority: optional
-Build-Depends: debhelper (>= 11),
+Build-Depends: debhelper (>= 12~),
                dh-python,
                python3,
                python3-setuptools,