diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1ffbd255e6..6305360721 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,18 @@
 
 ---
 
+## [3.1.5] — 2026-03-27
+
+### 🐛 Bug Fixes
+
+- **Backoff Auto-Decay** — Rate-limited accounts now auto-recover when their cooldown window expires, fixing a deadlock where high `backoffLevel` permanently deprioritized accounts (PR #657 by @brendandebeasi)
+
+### 🌍 i18n
+
+- **Chinese translation overhaul** — Comprehensive rewrite of `zh-CN.json` with improved accuracy (PR #658 by @only4copilot)
+
+---
+
 ## [3.1.4] — 2026-03-27
 
 ### 🐛 Bug Fixes
diff --git a/docs/openapi.yaml b/docs/openapi.yaml
index 3bb6399beb..6befd59f38 100644
--- a/docs/openapi.yaml
+++ b/docs/openapi.yaml
@@ -1,7 +1,7 @@
 openapi: 3.1.0
 info:
   title: OmniRoute API
-  version: 3.1.4
+  version: 3.1.5
   description: |
     OmniRoute is a local-first AI API proxy router. It provides an OpenAI-compatible
     endpoint that routes requests to multiple AI providers with load balancing,
diff --git a/package-lock.json b/package-lock.json
index 2556400191..1d5e3dca13 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "omniroute",
-  "version": "3.1.4",
+  "version": "3.1.5",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "omniroute",
-      "version": "3.1.4",
+      "version": "3.1.5",
       "hasInstallScript": true,
       "license": "MIT",
       "workspaces": [
diff --git a/package.json b/package.json
index 241e05e541..aceb5e45c1 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "omniroute",
-  "version": "3.1.4",
+  "version": "3.1.5",
   "description": "Smart AI Router with auto fallback — route to FREE & cheap models, zero downtime. Works with Cursor, Cline, Claude Desktop, Codex, and any OpenAI-compatible tool.",
   "type": "module",
   "bin": {