diff --git a/debian/changelog b/debian/changelog
index 67de1ff..8c8393d 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,12 @@
+uncommons-maths (1.2.3-3) UNRELEASED; urgency=medium
+
+ * Use correct machine-readable copyright file URI.
+ * Use secure URI in Homepage field.
+ * Bump debhelper from old 11 to 13.
+ * Set debhelper-compat version in Build-Depends.
+
+ -- Debian Janitor <janitor@jelmer.uk> Tue, 23 Jan 2024 05:36:33 -0000
+
uncommons-maths (1.2.3-2) unstable; urgency=medium
* Team upload.
diff --git a/debian/compat b/debian/compat
deleted file mode 100644
index b4de394..0000000
--- a/debian/compat
+++ /dev/null
@@ -1 +0,0 @@
-11
diff --git a/debian/control b/debian/control
index b3ef0f4..a251db9 100644
--- a/debian/control
+++ b/debian/control
@@ -3,7 +3,7 @@ Section: java
Priority: optional
Maintainer: Debian Java Maintainers <pkg-java-maintainers@lists.alioth.debian.org>
Build-Depends:
- debhelper (>= 11~),
+ debhelper-compat (= 13),
default-jdk-doc,
default-jdk,
gradle-debian-helper,
@@ -12,7 +12,7 @@ Build-Depends:
Standards-Version: 4.1.5
Vcs-Git: https://salsa.debian.org/java-team/uncommons-maths.git
Vcs-Browser: https://salsa.debian.org/java-team/uncommons-maths
-Homepage: http://maths.uncommons.org
+Homepage: https://maths.uncommons.org
Package: libuncommons-maths-java
Architecture: all
diff --git a/debian/copyright b/debian/copyright
index d3927a2..f9f5ee1 100644
--- a/debian/copyright
+++ b/debian/copyright
@@ -1,4 +1,4 @@
-Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0
+Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Source: https://github.com/dwdyer/uncommons-maths
Upstream-Name: Uncommons Maths
Files-Excluded: lib
