diff --git a/p/haskell-dual-tree/debian/changelog b/p/haskell-dual-tree/debian/changelog
index 83da0082bc..0f086b6c6f 100644
--- a/p/haskell-dual-tree/debian/changelog
+++ b/p/haskell-dual-tree/debian/changelog
@@ -1,3 +1,12 @@
+haskell-dual-tree (0.2.3.1-2) UNRELEASED; urgency=medium
+
+ * Update watch file format version to 4.
+ * Set upstream metadata fields: Archive, Bug-Database, Bug-Submit, Repository,
+ Repository-Browse.
+ * Update standards version to 4.6.2, no changes needed.
+
+ -- Debian Janitor <janitor@jelmer.uk> Wed, 10 May 2023 05:30:26 -0000
+
haskell-dual-tree (0.2.3.1-1) unstable; urgency=medium
* New upstream release
diff --git a/p/haskell-dual-tree/debian/control b/p/haskell-dual-tree/debian/control
index 937db2b931..780f5a4a9d 100644
--- a/p/haskell-dual-tree/debian/control
+++ b/p/haskell-dual-tree/debian/control
@@ -22,7 +22,7 @@ Build-Depends-Indep:
ghc-doc,
libghc-monoid-extras-doc,
libghc-semigroups-doc,
-Standards-Version: 4.6.1
+Standards-Version: 4.6.2
Homepage: https://hackage.haskell.org/package/dual-tree
Vcs-Browser: https://salsa.debian.org/haskell-team/DHG_packages/tree/master/p/haskell-dual-tree
Vcs-Git: https://salsa.debian.org/haskell-team/DHG_packages.git [p/haskell-dual-tree]
diff --git a/p/haskell-dual-tree/debian/upstream/metadata b/p/haskell-dual-tree/debian/upstream/metadata
new file mode 100644
index 0000000000..36c2c398d9
--- /dev/null
+++ b/p/haskell-dual-tree/debian/upstream/metadata
@@ -0,0 +1,6 @@
+---
+Archive: Hackage
+Bug-Database: https://github.com/diagrams/dual-tree/issues
+Bug-Submit: https://github.com/diagrams/dual-tree/issues/new
+Repository: https://github.com/diagrams/dual-tree.git
+Repository-Browse: https://github.com/diagrams/dual-tree
diff --git a/p/haskell-dual-tree/debian/watch b/p/haskell-dual-tree/debian/watch
index 8d34181c6b..f4d10910a1 100644
--- a/p/haskell-dual-tree/debian/watch
+++ b/p/haskell-dual-tree/debian/watch
@@ -1,2 +1,2 @@
-version=3
+version=4
https://hackage.haskell.org/package/dual-tree/distro-monitor .*-([0-9\.]+).(?:zip|tgz|tbz|txz|(?:tar\.(?:gz|bz2|xz)))