diff --git a/CHANGELOG.md b/CHANGELOG.md
index 167bdf7..3a742b9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,7 +4,38 @@ All notable changes to seismo-relay are documented here.
 
 ---
 
-## Unreleased
+## v0.30.0 — 2026-09-12
+
+**The series-4 correctness release** — the Thor / Micromate counterpart to
+v0.26.0's series-3 work.  The decoder is now verified per-sample against
+Thor's own CSV exports: **459 waveform files, 3,807,158 / 3,807,165 samples
+exact** across three independent ground-truth corpora, and production IDFW is
+**575/575** with zero truncations and zero decode failures.  Series-3
+re-verified **unchanged at 14,338/14,338** after every shared-codec change.
+
+⚠ **This release owes the prod store a Thor backfill.**  Every stored
+series-4 geophone value is **3.3% low**, and histogram peaks from monitoring
+runs longer than ~4 hours can be far worse (the interval cap discarded the
+tail, frequently the part holding the peak).  Run
+`scripts/backfill_thor_events.py` — `TOOL_VERSION` is bumped to `0.30.0`, so
+regeneration is gated correctly and **no `--force` is needed**.  DB backup
+first.  Series-3 events are untouched by this release and do not need
+re-running.
+
+⚠ **Terra-View displays these values.**  Series-4 geophone readings will rise
+~3.3% after the backfill, and some histogram PPVs will rise a great deal more.
+That is a correction, not a regression.
+
+
+### Fixed — event-report PDF used a per-trace geo Y scale
+
+The waveform plot scaled each geo lane to its own peak, so a small channel
+filled its lane and looked as large as a big one, and the `Geo: X in/s/div`
+footer reflected only whichever channel was measured first — wrong for the
+other two.  All three geo lanes now share one symmetric scale (max |sample|
+across them, padded, 0.05 in/s floor), matching the event modal and BW's
+single amp/div; the footer reflects that shared scale.  Mic keeps its own psi
+scale.  Large events are unchanged.
 
 ### Fixed — series-4 (Thor / Micromate) decoder is now per-sample exact
 
diff --git a/CLAUDE.md b/CLAUDE.md
index b3459e6..05ec9ea 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -2,7 +2,7 @@
 
 Ground-up Python replacement for **Blastware**, Instantel's Windows-only software for
 managing MiniMate Plus seismographs. Connects over direct RS-232 or cellular modem
-(Sierra Wireless RV50 / RV55). Current version: **v0.29.0**.
+(Sierra Wireless RV50 / RV55). Current version: **v0.30.0**.
 
 Stack-level context — which repo owns what, and how the three project versions
 pair — lives in `../terra-view/docs/tmi-stack.md`, which is also loaded as
diff --git a/README.md b/README.md
index dfe95e0..a11473c 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# seismo-relay  `v0.29.0`
+# seismo-relay  `v0.30.0`
 
 A ground-up replacement for **Blastware** — Instantel's aging Windows-only
 software for managing seismographs.  Supports both the **MiniMate Plus
diff --git a/minimateplus/event_file_io.py b/minimateplus/event_file_io.py
index d23fc6d..519cf4b 100644
--- a/minimateplus/event_file_io.py
+++ b/minimateplus/event_file_io.py
@@ -50,7 +50,7 @@ SIDECAR_KIND   = "sfm.event"
 # bumped without a `pip install` re-run — leading to confusing stale
 # version stamps in sidecars.  Bump this constant and CHANGELOG.md
 # together at release time.
-TOOL_VERSION = "0.29.0"
+TOOL_VERSION = "0.30.0"
 
 try:
     # Best-effort: prefer the installed metadata when it's NEWER than the
diff --git a/pyproject.toml b/pyproject.toml
index cd9281b..4b9e639 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "seismo-relay"
-version = "0.29.0"
+version = "0.30.0"
 description = "Python client and REST server for MiniMate Plus seismographs"
 requires-python = ">=3.10"
 dependencies = [