diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 52afe059..dc28bb87 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.42.0"
+  ".": "0.42.1"
 }
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index bb38cd8b..ec420cb7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## 0.42.1 (2024-12-19)
+
+Full Changelog: [v0.42.0...v0.42.1](https://github.com/anthropics/anthropic-sdk-python/compare/v0.42.0...v0.42.1)
+
+### Chores
+
+* bump testing data uri ([#800](https://github.com/anthropics/anthropic-sdk-python/issues/800)) ([641ae8d](https://github.com/anthropics/anthropic-sdk-python/commit/641ae8d412e365e44c8965222f487e30a63d57ee))
+
 ## 0.42.0 (2024-12-17)
 
 Full Changelog: [v0.41.0...v0.42.0](https://github.com/anthropics/anthropic-sdk-python/compare/v0.41.0...v0.42.0)
diff --git a/pyproject.toml b/pyproject.toml
index eeedaef8..0d86ebd3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "anthropic"
-version = "0.42.0"
+version = "0.42.1"
 description = "The official Python library for the anthropic API"
 dynamic = ["readme"]
 license = "MIT"
diff --git a/src/anthropic/_version.py b/src/anthropic/_version.py
index 56471244..5db6d0f2 100644
--- a/src/anthropic/_version.py
+++ b/src/anthropic/_version.py
@@ -1,4 +1,4 @@
 # File generated from our OpenAPI spec by Stainless. See CONTRIBUTING.md for details.
 
 __title__ = "anthropic"
-__version__ = "0.42.0"  # x-release-please-version
+__version__ = "0.42.1"  # x-release-please-version