diff --git a/debian/changelog b/debian/changelog
index 170090d..91f207a 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -2,6 +2,7 @@
 
   * Trim trailing whitespace.
   * Update watch file format version to 4.
+  * Bump debhelper from old 12 to 13.
 
  -- Debian Janitor <janitor@jelmer.uk>  Fri, 17 Sep 2021 11:30:37 -0000
 
diff --git a/debian/compat b/debian/compat
index 48082f7..b1bd38b 100644
--- a/debian/compat
+++ b/debian/compat
@@ -1 +1 @@
-12
+13
diff --git a/debian/control b/debian/control
index ff6d372..90206dd 100644
--- a/debian/control
+++ b/debian/control
@@ -3,7 +3,7 @@
 Priority: optional
 Maintainer: Debian Science Maintainers <debian-science-maintainers@lists.alioth.debian.org>
 Uploaders: Sebastien Delafond <seb@debian.org>, Picca Frédéric-Emmanuel <picca@debian.org>
-Build-Depends: debhelper (>= 12), dh-python, python3-setuptools, python3-all, python3-pytest-runner, python3-pytest, python3-mock
+Build-Depends: debhelper (>= 13~), dh-python, python3-setuptools, python3-all, python3-pytest-runner, python3-pytest, python3-mock
 Standards-Version: 4.5.0
 Homepage: https://github.com/DiamondLightSource/python-procrunner
 Vcs-Browser: https://salsa.debian.org/science-team/python-procrunner