diff --git a/debian/changelog b/debian/changelog
index 174ec79..065c9e4 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,23 @@
+ctdconverter (2.1-4) UNRELEASED; urgency=medium
+
+  * Reading package lists... 0%Reading package lists... 0%Reading package
+    lists... 0%Reading package lists... 99%Reading package lists... 99%Reading
+    package lists... Done Building dependency tree... 0%Building dependency
+    tree... 0%Building dependency tree... 50%Building dependency tree...
+    50%Building dependency tree... 89%Building dependency tree... Done Reading
+    state information... 0% Reading state information... 0%Reading state
+    information... Done Connecting to api.ftp-master.debian.org to check 7
+    package versions. Please wait... Got info from api.ftp-master.debian.org for
+    6 packages. Connecting to api.ftp-master.debian.org to check cwl-runner
+    versions. Please wait... got no info for cwl-runner  Changes applied to dpkg
+    configuration: - control source Standards-Version: '4.5.0' -> '4.6.0' #
+    applied fix for :Current standards version is '4.6.0'. Please read
+    https://www.debian.org/doc/debian-policy/upgrading-checklist.html for the
+    changes that may be needed on your package to upgrade it from standard
+    version '4.5.0' to '4.6.0'.
+
+ -- Debian Janitor <janitor@jelmer.uk>  Sat, 18 Sep 2021 17:01:41 -0000
+
 ctdconverter (2.1-3) unstable; urgency=medium
 
   * Team upload.
diff --git a/debian/control b/debian/control
index 52d6d25..60aeecc 100644
--- a/debian/control
+++ b/debian/control
@@ -13,7 +13,7 @@
                python3-ctdopts,
                help2man,
                2to3
-Standards-Version: 4.5.0
+Standards-Version: 4.6.0
 Vcs-Browser: https://salsa.debian.org/med-team/ctdconverter
 Vcs-Git: https://salsa.debian.org/med-team/ctdconverter.git
 Homepage: https://github.com/WorkflowConversion/CTDConverter