diff --git a/CHANGELOG.md b/CHANGELOG.md
index 776aa19..6c2ec4b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,8 @@ and Quipu uses [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
 
+## [0.5.1] - 2026-10-29
+
 ### Fixed
 
 - Parser errors, including invalid UTF-8, hiding recoverable compiler errors
@@ -102,7 +104,8 @@ and Quipu uses [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 - Bundled example projects and offline documentation.
 - A bounded compiled-rules cache.
 
-[Unreleased]: https://github.com/corelight/quipu/compare/v0.5.0...HEAD
+[Unreleased]: https://github.com/corelight/quipu/compare/v0.5.1...HEAD
+[0.5.1]: https://github.com/corelight/quipu/compare/v0.5.0...v0.5.1
 [0.5.0]: https://github.com/corelight/quipu/compare/v0.4.0...v0.5.0
 [0.4.0]: https://github.com/corelight/quipu/compare/v0.3.0...v0.4.0
 [0.3.0]: https://github.com/corelight/quipu/compare/v0.2.0...v0.3.0
diff --git a/app/package-lock.json b/app/package-lock.json
index b8e8b0e..ae6876d 100644
--- a/app/package-lock.json
+++ b/app/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "quipu",
-  "version": "0.5.0",
+  "version": "0.5.1",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "quipu",
-      "version": "0.5.0",
+      "version": "0.5.1",
       "license": "BSD-3-Clause",
       "dependencies": {
         "@tauri-apps/api": "^2",
diff --git a/app/package.json b/app/package.json
index 40bd3c2..0fe9310 100644
--- a/app/package.json
+++ b/app/package.json
@@ -1,7 +1,7 @@
 {
   "name": "quipu",
   "private": true,
-  "version": "0.5.0",
+  "version": "0.5.1",
   "description": "A desktop workbench for writing, validating, compiling, and testing YARA rules.",
   "license": "BSD-3-Clause",
   "homepage": "https://github.com/corelight/quipu",
diff --git a/docs/release-testing-0.5.1.md b/docs/release-testing-0.5.1.md
new file mode 100644
index 0000000..ab926dc
--- /dev/null
+++ b/docs/release-testing-0.5.1.md
@@ -0,0 +1,44 @@
+# Quipu 0.5.1 acceptance record
+
+Status: **pending**. The release remains a draft until the final packages have
+passed platform acceptance. The maintainer verified the diagnostics fix in the
+local `0.5.1-issue47.1` Debian test build; that does not mark the final release
+packages or other platforms tested.
+
+Record the `v0.5.1` source SHA, successful public main CI and Release run IDs,
+private signing run ID, and final package hashes alongside the results below.
+Use the draft's `RELEASE_BUILD.json`, macOS provenance records, and nine-package
+`SHA256SUMS` to identify the exact binaries tested. Do not replace tagged source
+or published binaries if a code fix is needed; prepare a new version instead.
+
+| Platform | OS / hardware | Packages | Result |
+| --- | --- | --- | --- |
+| Linux x86-64 | Pending | AppImage, DEB, RPM | Pending |
+| Windows x86-64 | Pending | Standard/offline EXE and MSI; upgrade | Pending |
+| macOS Apple Silicon | Pending | Signed aarch64 DMG | Pending |
+| macOS Intel | Pending | Signed x64 DMG | Pending |
+
+For each platform:
+
+- Install or upgrade from 0.5.0 and launch normally. On macOS, use a browser
+  download, keep Gatekeeper enabled, install into Applications, and record prior
+  Quipu approval history. No security override should be needed.
+- Verify [#47](https://github.com/corelight/quipu/issues/47): an invalid UTF-8
+  file and an ordinary syntax error must still allow recoverable semantic
+  errors and warnings from other selected files to appear in Problems. Confirm
+  file/line navigation works for readable files and Scan stays unavailable
+  after a failed compile, including after a previous successful compile.
+- Open bundled examples, compile rules with includes, scan text and files,
+  and inspect expected matches. Check editor diagnostics and structural errors
+  such as missing includes and cycles.
+- Edit, save, recompile, quit, and reopen. Restore cached compiled rules and
+  scan again. Exercise native menus, shortcuts, copy/paste, file dialogs,
+  preferences, pane layout, and offline help.
+- Check unsaved edits: Cancel preserves work and explicit discard/quit works.
+  On Windows, cover actual standard/offline EXE and MSI installation and
+  WebView2 behavior. On both macOS architectures, compile and scan in the final
+  signed app to exercise the hardened-runtime JIT.
+
+Record issues and their resolutions before marking any row passed. Automated
+build/signature checks and earlier release acceptance do not replace these
+checks against the final 0.5.1 packages.