diff --git a/debian/changelog b/debian/changelog
index 4ca6d30..7441774 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -2,6 +2,7 @@
 
   * Trim trailing whitespace.
   * Use secure copyright file specification URI.
+  * Bump debhelper from deprecated 9 to 12.
 
  -- Debian Janitor <janitor@jelmer.uk>  Tue, 20 Jul 2021 08:55:12 -0000
 
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 c80c713..1929506 100644
--- a/debian/control
+++ b/debian/control
@@ -3,7 +3,7 @@
 Priority: optional
 Maintainer: Julian Wollrath <jwollrath@web.de>
 Uploaders: Enrico Tassi <gareuselesinge@debian.org>
-Build-Depends: debhelper (>= 9),
+Build-Depends: debhelper (>= 12~),
                dh-lua (>= 16),
                lua-discount,
                lua-filesystem,