diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index ddc20118..cb9d2541 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.21.3"
+  ".": "0.22.0"
 }
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 988353fe..dbf3772d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,36 @@
 # Changelog
 
+## 0.22.0 (2024-04-04)
+
+Full Changelog: [v0.21.3...v0.22.0](https://github.com/anthropics/anthropic-sdk-python/compare/v0.21.3...v0.22.0)
+
+### Features
+
+* **client:** increase default HTTP max_connections to 1000 and max_keepalive_connections to 100 ([#428](https://github.com/anthropics/anthropic-sdk-python/issues/428)) ([9a43940](https://github.com/anthropics/anthropic-sdk-python/commit/9a4394008db937a9ad851589b9adfbd9e15333ef))
+* **package:** export default constants ([#423](https://github.com/anthropics/anthropic-sdk-python/issues/423)) ([0d694e1](https://github.com/anthropics/anthropic-sdk-python/commit/0d694e157b040993d937f136c5072c98b87434ff))
+
+
+### Bug Fixes
+
+* **client:** correct logic for line decoding in streaming ([#433](https://github.com/anthropics/anthropic-sdk-python/issues/433)) ([6bf9379](https://github.com/anthropics/anthropic-sdk-python/commit/6bf93794127a62a077f2e50a2acfe01464742319))
+* **project:** use absolute github links on PyPi ([#427](https://github.com/anthropics/anthropic-sdk-python/issues/427)) ([cbd8b1c](https://github.com/anthropics/anthropic-sdk-python/commit/cbd8b1c789e83d2c84ba10165778e4ad2af1ac20))
+* revert regression with 3.7 support ([#419](https://github.com/anthropics/anthropic-sdk-python/issues/419)) ([fa21f36](https://github.com/anthropics/anthropic-sdk-python/commit/fa21f3643714d985b10b45dc8bfc3887ed20eba7))
+* **streaming:** correct accumulation of output tokens ([#426](https://github.com/anthropics/anthropic-sdk-python/issues/426)) ([b50ed05](https://github.com/anthropics/anthropic-sdk-python/commit/b50ed05a991f02bccfd9f65a1c59e56540adba08))
+
+
+### Chores
+
+* **client:** validate that max_retries is not None ([#430](https://github.com/anthropics/anthropic-sdk-python/issues/430)) ([31b2a2f](https://github.com/anthropics/anthropic-sdk-python/commit/31b2a2fd4069a670c795eeaf51b641fbf2097af1))
+* **internal:** bump dependencies ([#421](https://github.com/anthropics/anthropic-sdk-python/issues/421)) ([30e8031](https://github.com/anthropics/anthropic-sdk-python/commit/30e8031469a4c4beb0bb906920f53d5d4da2e2c3))
+* **internal:** defer model build for import latency ([#431](https://github.com/anthropics/anthropic-sdk-python/issues/431)) ([51d4783](https://github.com/anthropics/anthropic-sdk-python/commit/51d47832ae44415604725bb763cf567fb9dc1b34))
+* **internal:** formatting change ([#415](https://github.com/anthropics/anthropic-sdk-python/issues/415)) ([1474f44](https://github.com/anthropics/anthropic-sdk-python/commit/1474f443201949c9b8a7d0a8562968d57d421fb5))
+
+
+### Documentation
+
+* **contributing:** fix typo ([#414](https://github.com/anthropics/anthropic-sdk-python/issues/414)) ([aeaf995](https://github.com/anthropics/anthropic-sdk-python/commit/aeaf99573a9140b6bb5c0af4cefddbd6f469a6a5))
+* **readme:** change undocumented params wording ([#429](https://github.com/anthropics/anthropic-sdk-python/issues/429)) ([1336958](https://github.com/anthropics/anthropic-sdk-python/commit/13369583fc74101e002427079c9871e05e5536e8))
+
 ## 0.21.3 (2024-03-21)
 
 Full Changelog: [v0.21.2...v0.21.3](https://github.com/anthropics/anthropic-sdk-python/compare/v0.21.2...v0.21.3)
diff --git a/pyproject.toml b/pyproject.toml
index aec49fe5..898f6ccb 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "anthropic"
-version = "0.21.3"
+version = "0.22.0"
 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 35030520..a9dc4abf 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__ = "0.21.3"  # x-release-please-version
+__version__ = "0.22.0"  # x-release-please-version