diff --git a/debian/changelog b/debian/changelog
index 433caae..f24a6da 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,9 @@
+geos (3.8.1-2) UNRELEASED; urgency=medium
+
+  * Bump watch file version to 4.
+
+ -- Bas Couwenberg <sebastic@debian.org>  Fri, 06 Nov 2020 18:50:02 +0100
+
 geos (3.8.1-1) unstable; urgency=medium
 
   * Bump debhelper compat to 10, changes:
diff --git a/debian/watch b/debian/watch
index 444480a..1e38120 100644
--- a/debian/watch
+++ b/debian/watch
@@ -1,4 +1,4 @@
-version=3
+version=4
 opts=\
 dversionmangle=s/\+(debian|dfsg|ds|deb)\d*$//,\
 uversionmangle=s/(\d)[_\.\-\+]?((RC|rc|pre|dev|beta|alpha)\d*)$/$1~$2/;s/RC/rc/ \