diff --git a/packages/std/CHANGELOG.md b/packages/std/CHANGELOG.md
index 164fcea3..1c7726a0 100644
--- a/packages/std/CHANGELOG.md
+++ b/packages/std/CHANGELOG.md
@@ -2,6 +2,8 @@
 
 ## [Unreleased]
 
+## [0.20.0] - 2026-09-30
+
 ### Added
 
 - Added `isUtf8`, a runtime-agnostic validator for complete UTF-8 byte sequences. It accepts `Uint8Array` and `ArrayBuffer` inputs without decoding them to a string, throws a `TypeError` on other types, and treats detached buffers as empty.
diff --git a/packages/std/package.json b/packages/std/package.json
index 30b6e201..3133bbc9 100644
--- a/packages/std/package.json
+++ b/packages/std/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@opentf/std",
-  "version": "0.19.0",
+  "version": "0.20.0",
   "description": "The Modern JavaScript Standard Library. A lightweight, high-accuracy, runtime-agnostic collection of essential utilities.",
   "keywords": [
     "collection",