diff --git a/CHANGELOG.md b/CHANGELOG.md
index 88109be85..66418c187 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## [1.37.22] — 2026-08-15
+
+### Fixed
+
+- The doctor-report export refuses a selection that includes nothing instead of rendering an empty document. The selection panel already disabled its own button in that state, so this only ever reached the server through a hand-built request, and it spent an export slot on a file with no content in it.
+- A lab value in the FHIR export no longer names UCUM as its unit system when it carries no UCUM code. That combination told a receiving system the unit was coded when it was not, which is worse than saying nothing: the unit still travels as a display string, and the coded form appears only when the analyte and unit actually resolve to one.
+
 ## [1.37.21] — 2026-08-14
 
 ### Fixed
diff --git a/docs/api/openapi.yaml b/docs/api/openapi.yaml
index 33df1201c..a1f24e691 100644
--- a/docs/api/openapi.yaml
+++ b/docs/api/openapi.yaml
@@ -1,7 +1,7 @@
 openapi: 3.1.0
 info:
   title: HealthLog API
-  version: 1.37.21
+  version: 1.37.22
   description: >-
     Self-hosted personal-health-tracking PWA — public API surface for the iOS native client and external ingest.
 
diff --git a/package.json b/package.json
index d7cff0ed2..3a19812db 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "healthlog",
-  "version": "1.37.21",
+  "version": "1.37.22",
   "description": "Self-hosted personal-health-tracking PWA with Withings integration, AI insights, and doctor-report PDF export.",
   "license": "PolyForm-Noncommercial-1.0.0",
   "homepage": "https://healthlog.dev",
diff --git a/public/sw.js b/public/sw.js
index 82e5879f3..be5aaff9e 100644
--- a/public/sw.js
+++ b/public/sw.js
@@ -36,7 +36,7 @@ try {
 // v1.4.38.4 → v1.4.42. Do not hand-edit; bump `package.json` and rebuild.
 const CACHE_VERSION =
   (typeof self !== "undefined" && self.__APP_VERSION__) ||
-  /* @sw-version-fallback */ "v1.37.21";
+  /* @sw-version-fallback */ "v1.37.22";
 const STATIC_CACHE = `healthlog-static-${CACHE_VERSION}`;
 const PAGE_CACHE = `healthlog-pages-${CACHE_VERSION}`;
 // v1.18.6 — read-only data cache for a curated allowlist of safe GET `/api/*`