diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 61d831bd..bf7b1f4c 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.31.2"
+  ".": "0.31.3"
 }
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index eb6ddbf4..8da39e3f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,15 @@
 # Changelog
 
+## 0.31.3 (2024-07-24)
+
+Full Changelog: [v0.31.2...v0.31.3](https://github.com/anthropics/anthropic-sdk-python/compare/v0.31.2...v0.31.3)
+
+### Chores
+
+* **docs:** document how to do per-request http client customization ([#603](https://github.com/anthropics/anthropic-sdk-python/issues/603)) ([5161f62](https://github.com/anthropics/anthropic-sdk-python/commit/5161f626a0bec757b96217dc0f81e8908546f29a))
+* sync spec ([#605](https://github.com/anthropics/anthropic-sdk-python/issues/605)) ([6b7707f](https://github.com/anthropics/anthropic-sdk-python/commit/6b7707f62788fca2e166209e82935a2a2fa8204a))
+* **tests:** update prism version ([#607](https://github.com/anthropics/anthropic-sdk-python/issues/607)) ([1797dc6](https://github.com/anthropics/anthropic-sdk-python/commit/1797dc6139ffaca6436ed897972471e67ba1b828))
+
 ## 0.31.2 (2024-07-17)
 
 Full Changelog: [v0.31.1...v0.31.2](https://github.com/anthropics/anthropic-sdk-python/compare/v0.31.1...v0.31.2)
diff --git a/pyproject.toml b/pyproject.toml
index 10921bf7..d2eb1365 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "anthropic"
-version = "0.31.2"
+version = "0.31.3"
 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 040dba2e..5a3723b1 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__ = "0.31.2"  # x-release-please-version
+__version__ = "0.31.3"  # x-release-please-version