diff --git a/CHANGELOG.md b/CHANGELOG.md
index 949772a..74d1cfd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,24 @@ backfill releases from before this changelog.
 
 ## [Unreleased]
 
+## [0.4.0] - 2026-09-18
+
+### Added
+
+- Show local-day read and write totals with their recorded timezone, labelled as totals so far for the current day.
+- Open the dashboard on a live three-hour written-volume graph with a read/write toggle and selected-point inspection.
+- Browse history by day from the keyboard with `[`, `]`, `g` date entry, and `t` for today and the live view.
+
+### Changed
+
+- Collect every three minutes on systemd and runit, plot live points at their actual timestamps, and retain three-minute detail for 14 days before durable summaries.
+- Withhold the endurance outlook until one full local observation day has usable evidence, then show it with categorical confidence.
+
+### Fixed
+
+- Keep midnight-spanning activity once as shared boundary evidence instead of adding it to both days.
+- Publish derived hour and day history consistently with each collection run.
+
 ## [0.3.7] - 2026-09-16
 
 ### Changed
diff --git a/pyproject.toml b/pyproject.toml
index 3535dab..0aaaa86 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "fenris"
-version = "0.3.7"
+version = "0.4.0"
 description = "NVMe wear monitor with persistent TUI"
 requires-python = ">=3.10"
 license = {file = "LICENSE"}
diff --git a/src/fenris/__init__.py b/src/fenris/__init__.py
index dc89599..607ce04 100644
--- a/src/fenris/__init__.py
+++ b/src/fenris/__init__.py
@@ -1,2 +1,2 @@
 """Fenris: NVMe wear monitor with persistent TUI."""
-__version__ = "0.3.7"
+__version__ = "0.4.0"