diff -Nru iapws-1.5.2/debian/changelog iapws-1.5.3/debian/changelog
--- iapws-1.5.2/debian/changelog	2020-07-02 18:16:28.000000000 +0000
+++ iapws-1.5.3/debian/changelog	2022-10-03 09:07:35.000000000 +0000
@@ -1,3 +1,11 @@
+iapws (1.5.3-1) unstable; urgency=medium
+
+  * New upstream release
+  * Move to debhelper level 13
+  * Standards-Version: 4.6.1; no changes required
+
+ -- Alastair McKinstry <mckinstry@debian.org>  Mon, 03 Oct 2022 10:07:35 +0100
+
 iapws (1.5.2-1) unstable; urgency=medium
 
   * New upstream release
diff -Nru iapws-1.5.2/debian/control iapws-1.5.3/debian/control
--- iapws-1.5.2/debian/control	2020-07-02 18:16:28.000000000 +0000
+++ iapws-1.5.3/debian/control	2022-10-03 09:07:35.000000000 +0000
@@ -2,12 +2,12 @@
 Section: python
 Priority: optional
 Maintainer: Alastair McKinstry <mckinstry@debian.org>
-Build-Depends: debhelper-compat (= 12), 
+Build-Depends: debhelper-compat (= 13), 
  dh-sequence-python3,
  python3-all, 
  python3-setuptools, 
  python3-scipy, 
-Standards-Version: 4.5.0
+Standards-Version: 4.6.1
 Homepage: https://pypi.python.org/pypi/iapws
 Vcs-Browser: https://salsa.debian.org:/science-team/iapws.git
 Vcs-Git: https://salsa.debian.org:/science-team/iapws.git