diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 38acea67..18eef3d5 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.12.1"
+  ".": "0.12.2"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1554ef10..9b0c3ff9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,18 @@
 # Changelog
 
+## 0.12.2 (2024-01-11)
+
+Full Changelog: [v0.12.1...v0.12.2](https://github.com/anthropics/anthropic-sdk-typescript/compare/v0.12.1...v0.12.2)
+
+### Bug Fixes
+
+* use default base url if BASE_URL env var is blank ([#250](https://github.com/anthropics/anthropic-sdk-typescript/issues/250)) ([e38f32f](https://github.com/anthropics/anthropic-sdk-typescript/commit/e38f32f52398f3a082eb745e85179242ecee7663))
+
+
+### Chores
+
+* **internal:** narrow type into stringifyQuery ([#253](https://github.com/anthropics/anthropic-sdk-typescript/issues/253)) ([3f42e07](https://github.com/anthropics/anthropic-sdk-typescript/commit/3f42e0702ab55cd841c0dc186732028d2fb9f5bb))
+
 ## 0.12.1 (2024-01-08)
 
 Full Changelog: [v0.12.0...v0.12.1](https://github.com/anthropics/anthropic-sdk-typescript/compare/v0.12.0...v0.12.1)
diff --git a/package.json b/package.json
index 450c6e5b..293c8ea3 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@anthropic-ai/sdk",
-  "version": "0.12.1",
+  "version": "0.12.2",
   "description": "The official TypeScript library for the Anthropic API",
   "author": "Anthropic <support@anthropic.com>",
   "types": "dist/index.d.ts",
diff --git a/src/version.ts b/src/version.ts
index cee26bb1..db09de58 100644
--- a/src/version.ts
+++ b/src/version.ts
@@ -1 +1 @@
-export const VERSION = '0.12.1'; // x-release-please-version
+export const VERSION = '0.12.2'; // x-release-please-version