diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2c32316bb..7bf72a31a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -17,6 +17,8 @@ Two things are versioned separately from this file and worth knowing about:
 
 ## [Unreleased]
 
+## [0.0.521] - 2026-10-06
+
 ### Fixed
 
 - A burst of refreshes on one cookie no longer signs the person out. The reuse
diff --git a/backend/pyproject.toml b/backend/pyproject.toml
index fdfe32434..7394f85ac 100644
--- a/backend/pyproject.toml
+++ b/backend/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "agenticos"
-version = "0.0.520"
+version = "0.0.521"
 description = "OS for your agents."
 requires-python = ">=3.12"
 license = { text = "Apache-2.0" }
diff --git a/backend/uv.lock b/backend/uv.lock
index 8f62f131d..c0f8688cd 100644
--- a/backend/uv.lock
+++ b/backend/uv.lock
@@ -9,7 +9,7 @@ resolution-markers = [
 
 [[package]]
 name = "agenticos"
-version = "0.0.520"
+version = "0.0.521"
 source = { editable = "." }
 dependencies = [
     { name = "aiogram" },
diff --git a/frontend/package.json b/frontend/package.json
index 84612bab1..a364f4e0f 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -1,6 +1,6 @@
 {
   "name": "agenticos-frontend",
-  "version": "0.0.520",
+  "version": "0.0.521",
   "private": true,
   "license": "Apache-2.0",
   "scripts": {