diff --git a/debian/changelog b/debian/changelog
index d0639b6..8673d5e 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -3,6 +3,7 @@ icdiff (1.9.5-2) UNRELEASED; urgency=low
   * Use secure URI in Homepage field.
   * Set debhelper-compat version in Build-Depends.
   * Update standards version to 4.5.0, no changes needed.
+  * Update watch file format version to 4.
 
  -- Debian Janitor <janitor@jelmer.uk>  Sat, 11 Jul 2020 14:53:14 -0000
 
diff --git a/debian/watch b/debian/watch
index d09a37a..3570832 100644
--- a/debian/watch
+++ b/debian/watch
@@ -1,3 +1,2 @@
-version=3
+version=4
 https://github.com/jeffkaufman/icdiff/releases .*/archive/release-(\d[\d.-]+)\.(?:tar(?:\.gz|\.bz2)?|tgz)
-