diff --git a/debian/changelog b/debian/changelog
index 29f6994..a3514f7 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,6 +1,7 @@
 python-procrunner (1.1.0-2) UNRELEASED; urgency=medium
 
   * Trim trailing whitespace.
+  * Update watch file format version to 4.
 
  -- Debian Janitor <janitor@jelmer.uk>  Thu, 04 Nov 2021 11:13:33 -0000
 
diff --git a/debian/watch b/debian/watch
index b2f28a4..b2802bd 100644
--- a/debian/watch
+++ b/debian/watch
@@ -1,2 +1,2 @@
-version=3
+version=4
 https://github.com/DiamondLightSource/python-procrunner/tags .*/v(\d[\d\.]*)\.tar\.gz debian uupdate