diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index a7130553..9d5158bf 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.12.0"
+  ".": "0.12.1"
 }
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 32fe3e3d..3b1cdf25 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,14 @@
 # Changelog
 
+## 0.12.1 (2024-01-27)
+
+Full Changelog: [v0.12.0...v0.12.1](https://github.com/anthropics/anthropic-sdk-python/compare/v0.12.0...v0.12.1)
+
+### Chores
+
+* **internal:** enable ruff type checking misuse lint rule ([#324](https://github.com/anthropics/anthropic-sdk-python/issues/324)) ([6587598](https://github.com/anthropics/anthropic-sdk-python/commit/6587598162387c0aada958df22610a93198e813d))
+* **internal:** support multipart data with overlapping keys ([#322](https://github.com/anthropics/anthropic-sdk-python/issues/322)) ([9ecab60](https://github.com/anthropics/anthropic-sdk-python/commit/9ecab6048afeca544146b9629bcdaa5250012cc9))
+
 ## 0.12.0 (2024-01-25)
 
 Full Changelog: [v0.11.0...v0.12.0](https://github.com/anthropics/anthropic-sdk-python/compare/v0.11.0...v0.12.0)
diff --git a/pyproject.toml b/pyproject.toml
index fd2de9e9..003e27f7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "anthropic"
-version = "0.12.0"
+version = "0.12.1"
 description = "The official Python library for the anthropic API"
 readme = "README.md"
 license = "MIT"
diff --git a/src/anthropic/_version.py b/src/anthropic/_version.py
index e0195b37..30a19109 100644
--- a/src/anthropic/_version.py
+++ b/src/anthropic/_version.py
@@ -1,4 +1,4 @@
 # File generated from our OpenAPI spec by Stainless.
 
 __title__ = "anthropic"
-__version__ = "0.12.0"  # x-release-please-version
+__version__ = "0.12.1"  # x-release-please-version