diff --git a/CHANGELOG.md b/CHANGELOG.md
index 61f7d544..c7bd7b02 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,19 @@
 
 ## [Unreleased]
 
+## [0.21.1] - 2026-06-26
+
+### Fixed
+- **`rivet modify --set-release` (and any new-base-field insert) no longer
+  corrupts artifacts with a trailing block mapping (data loss).** `--set-release`
+  — shipped in v0.21.0 — spliced the new `release:` key *between* a trailing
+  `provenance:` block and its children, producing invalid YAML so the artifact
+  (and its file-mates) vanished on reload. Since every AI-stamped artifact has a
+  `provenance:` block, this hit most artifacts the command touched. The inserter
+  now skips a field's full extent, including nested block-mapping children, and
+  places the new field after the whole block. Found by dogfooding the v0.21.0
+  release field. (REQ-004)
+
 ## [0.21.0] - 2026-06-26
 
 Theme: **Authoring & release ergonomics** — fix the dogfooding friction that
diff --git a/Cargo.lock b/Cargo.lock
index f7bc21f9..84f050ee 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1134,7 +1134,7 @@ dependencies = [
 
 [[package]]
 name = "etch"
-version = "0.21.0"
+version = "0.21.1"
 dependencies = [
  "petgraph 0.7.1",
 ]
@@ -3171,7 +3171,7 @@ dependencies = [
 
 [[package]]
 name = "rivet-cli"
-version = "0.21.0"
+version = "0.21.1"
 dependencies = [
  "anyhow",
  "axum",
@@ -3199,7 +3199,7 @@ dependencies = [
 
 [[package]]
 name = "rivet-core"
-version = "0.21.0"
+version = "0.21.1"
 dependencies = [
  "anyhow",
  "criterion",
diff --git a/Cargo.toml b/Cargo.toml
index f5100f29..605f3b3f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -15,7 +15,7 @@ members = [
 exclude = ["compose-witness"]
 
 [workspace.package]
-version = "0.21.0"
+version = "0.21.1"
 authors = ["PulseEngine <https://github.com/pulseengine>"]
 edition = "2024"
 license = "Apache-2.0"
diff --git a/vscode-rivet/package.json b/vscode-rivet/package.json
index 2f69ea72..d3f5f3d4 100644
--- a/vscode-rivet/package.json
+++ b/vscode-rivet/package.json
@@ -3,7 +3,7 @@
   "displayName": "Rivet SDLC",
   "description": "SDLC artifact traceability with live validation, hover info, and embedded dashboard",
   "publisher": "pulseengine",
-  "version": "0.21.0",
+  "version": "0.21.1",
   "license": "MIT",
   "repository": {
     "type": "git",