diff --git a/.github/workflows/debian-package.yml b/.github/workflows/debian-package.yml
new file mode 100644
index 0000000..0ed4566
--- /dev/null
+++ b/.github/workflows/debian-package.yml
@@ -0,0 +1,23 @@
+name: Debian package
+
+on:
+  push:
+    branches:
+      - feature/*
+      - main
+  workflow_dispatch:
+
+jobs:
+  build-deb:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out source
+        uses: actions/checkout@v3
+
+      - name: build debian package
+        uses: jtdor/build-deb-action@v1
+        env:
+          DEB_BUILD_OPTIONS: noautodbgsym
+        with:
+          buildpackage-opts: --build=binary --no-sign
+          docker-image: ubuntu:focal
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6d43d37..927b7db 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,12 @@ Notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [3.0.4] - 2023-12-29
+
+### Changed
+
+- Ensure test suite is timezone-independent.
+
 ## [3.0.3] - 2023-12-29
 
 ### Changed
diff --git a/Makefile b/Makefile
index a70d152..691941c 100644
--- a/Makefile
+++ b/Makefile
@@ -10,7 +10,7 @@ PREFIX=/usr/local
 SHAREDIR=share/$(NAME)
 SYSTEMD_SERVICE_DIR=/lib/systemd/system
 USER=$(NAME)
-VERSION=3.0.3
+VERSION=3.0.4
 RELEASE=1
 
 TESTS=\
@@ -54,15 +54,13 @@ install:
 		src/jinja2_render.py src/ntpmon.env > $(DESTDIR)/$(CONFDIR)/$(NAME)
 
 release:
+	grep -qw "$(VERSION)" CHANGELOG.md
 	dch --newversion $(VERSION)-$(RELEASE)
 	dch --release --distribution focal
-	for i in CHANGELOG.md debian/changelog debian/*.rst; do \
-		grep -qw "$(VERSION)" $$i || exit 1; \
-	done
+	git commit -m'Prepare $(VERSION) release' -a
 
 tag:
-	git commit -m'Prepare $(VERSION) release' -a
-	git tag --sign v$(VERSION)
+	git tag --sign -m'$(VERSION) release' v$(VERSION)
 	git push --tags
 
 dput:
diff --git a/debian/changelog b/debian/changelog
index 77caf7f..031a25f 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,9 @@
+ntpmon (3.0.4-1) focal; urgency=medium
+
+  * New upstream release to fix test suite.
+
+ -- Paul Gear <github@libertysys.com.au>  Fri, 29 Dec 2023 15:52:46 +1000
+
 ntpmon (3.0.3-1) focal; urgency=medium
 
   * Further fixes to focal build.
diff --git a/debian/check_ntpmon-man.rst b/debian/check_ntpmon-man.rst
index 9e20330..21d3ecd 100644
--- a/debian/check_ntpmon-man.rst
+++ b/debian/check_ntpmon-man.rst
@@ -1,4 +1,4 @@
-:Version: 3.0.3
+:Version: 3.0
 :Date: 2023-12-28
 :Copyright: 2015-2023 Paul Gear
 :Title: check_ntpmon
@@ -25,11 +25,15 @@ Common Options
 
 options:
   -h, --help            show this help message and exit
+
   --check [{proc,offset,peers,reach,reachability,sync,vars} ...]
                         Select checks to run; if omitted, run all checks.
+
   --debug               Include command output and internal state dump along
                         with check results.
+
   --run-time RUN_TIME   Time in seconds (default: 512) for which to always
                         return OK after NTP daemon startup.
+
   --test                Obtain peer stats on standard input instead of from
                         running daemon.
diff --git a/debian/ntpmon-man.rst b/debian/ntpmon-man.rst
index 364292b..2240abe 100644
--- a/debian/ntpmon-man.rst
+++ b/debian/ntpmon-man.rst
@@ -1,4 +1,4 @@
-:Version: 3.0.3
+:Version: 3.0
 :Date: 2023-12-28
 :Copyright: 2015-2023 Paul Gear
 :Title: ntpmon
diff --git a/src/peer_stats.py b/src/peer_stats.py
index 21a014b..2a94fdf 100755
--- a/src/peer_stats.py
+++ b/src/peer_stats.py
@@ -190,7 +190,7 @@ def extract_chrony_tracking(f: List[str]) -> dict:
 def extract_ntp_peerstats(f: List[str]) -> dict:
     basefields = {
         # sorted by field position rather than name
-        "datetime": datetime.datetime.fromtimestamp(mjd_to_timestamp(float(f[0]), float(f[1]))),
+        "datetime": datetime.datetime.fromtimestamp(mjd_to_timestamp(float(f[0]), float(f[1])), tz=datetime.timezone.utc),
         "source": f[2],
         "offset": float(f[4]),
         "delay": float(f[5]),
diff --git a/unit_tests/test_peer_stats.py b/unit_tests/test_peer_stats.py
index d7065d2..99bef59 100644
--- a/unit_tests/test_peer_stats.py
+++ b/unit_tests/test_peer_stats.py
@@ -69,7 +69,7 @@ def test_parse_ntpd_peerstats() -> None:
     assert all([m is not None for m in measurements])
     assert measurements[0]["reachable"] == True
     assert measurements[0]["type"] == "survivor"
-    assert measurements[1]["datetime"] == datetime.datetime(2023, 12, 25, 18, 41, 56, 612000)
+    assert measurements[1]["datetime"] == datetime.datetime(2023, 12, 25, 8, 41, 56, 612000, tzinfo=datetime.timezone.utc)
     assert measurements[2]["offset"] > 0
     assert measurements[3]["type"] == "outlier"
     assert measurements[5]["type"] == "sync"