diff --git a/debian/changelog b/debian/changelog
index 262d9c2..4de42ed 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,9 @@
+fastaq (3.17.0-4) UNRELEASED; urgency=medium
+
+  * Update watch file format version to 4.
+
+ -- Debian Janitor <janitor@jelmer.uk>  Thu, 22 Apr 2021 11:25:36 -0000
+
 fastaq (3.17.0-3) unstable; urgency=medium
 
   * Use debhelper-compat 12.
diff --git a/debian/watch b/debian/watch
index 46c1516..03a59ff 100644
--- a/debian/watch
+++ b/debian/watch
@@ -1,3 +1,2 @@
-version=3
+version=4
 https://github.com/sanger-pathogens/fastaq/releases .*/archive/v(\d[\d.-]+)\.(?:tar(?:\.gz|\.bz2)?|tgz)
-