diff --git a/CHANGELOG.md b/CHANGELOG.md
index 74e9fb12b9..05d9598f7a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,19 @@
 
 ---
 
+## [2.6.4] — 2026-03-17
+
+### 🐛 Bug Fixes
+
+- **fix(providers)**: Removed non-existent model names across 5 providers:
+  - **gemini / gemini-cli**: removed `gemini-3.1-pro/flash` and `gemini-3-*-preview` (don't exist in Google API v1beta); replaced with `gemini-2.5-pro`, `gemini-2.5-flash`, `gemini-2.0-flash`, `gemini-1.5-pro/flash`
+  - **antigravity**: removed `gemini-3.1-pro-high/low` and `gemini-3-flash` (invalid internal aliases); replaced with real 2.x models
+  - **github (Copilot)**: removed `gemini-3-flash-preview` and `gemini-3-pro-preview`; replaced with `gemini-2.5-flash`
+  - **nvidia**: corrected `nvidia/llama-3.3-70b-instruct` → `meta/llama-3.3-70b-instruct` (NVIDIA NIM uses `meta/` namespace for Meta models); added `nvidia/llama-3.1-70b-instruct` and `nvidia/llama-3.1-405b-instruct`
+- **fix(db/combo)**: Updated `free-stack` combo on remote DB: removed `qw/qwen3-coder-plus` (expired refresh token), corrected `nvidia/llama-3.3-70b-instruct` → `nvidia/meta/llama-3.3-70b-instruct`, corrected `gemini/gemini-3.1-flash` → `gemini/gemini-2.5-flash`, added `if/deepseek-v3.2`
+
+---
+
 ## [2.6.3] — 2026-03-16
 
 > Sprint: zod/pino hash-strip baked into build pipeline, Synthetic provider added, VPS PM2 path corrected.
diff --git a/docs/openapi.yaml b/docs/openapi.yaml
index 0a58648e33..73f178b1af 100644
--- a/docs/openapi.yaml
+++ b/docs/openapi.yaml
@@ -1,7 +1,7 @@
 openapi: 3.1.0
 info:
   title: OmniRoute API
-  version: 2.6.3
+  version: 2.6.4
   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 a88f67c598..d8c4b67834 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "omniroute",
-  "version": "2.6.3",
+  "version": "2.6.4",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "omniroute",
-      "version": "2.6.3",
+      "version": "2.6.4",
       "hasInstallScript": true,
       "license": "MIT",
       "workspaces": [
diff --git a/package.json b/package.json
index 85d048d9a4..9f9296630e 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "omniroute",
-  "version": "2.6.3",
+  "version": "2.6.4",
   "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": {