diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index f7e8d650..db36e4bc 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,5 +1,5 @@
 {
-  ".": "0.27.3",
-  "packages/vertex-sdk": "0.4.1",
-  "packages/bedrock-sdk": "0.10.2"
+  ".": "0.28.0",
+  "packages/vertex-sdk": "0.4.2",
+  "packages/bedrock-sdk": "0.10.3"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index ed3f9175..104810fb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,33 @@
 # Changelog
 
+## 0.28.0 (2024-10-04)
+
+Full Changelog: [sdk-v0.27.3...sdk-v0.28.0](https://github.com/anthropics/anthropic-sdk-typescript/compare/sdk-v0.27.3...sdk-v0.28.0)
+
+### Features
+
+* **api:** support disabling parallel tool use ([#540](https://github.com/anthropics/anthropic-sdk-typescript/issues/540)) ([df0032f](https://github.com/anthropics/anthropic-sdk-typescript/commit/df0032f263884190b31a63ddcb20429372617deb))
+* **client:** allow overriding retry count header ([#536](https://github.com/anthropics/anthropic-sdk-typescript/issues/536)) ([ec11f91](https://github.com/anthropics/anthropic-sdk-typescript/commit/ec11f9189e9a24f413a9d48b21a10ce88e367ac3))
+* **client:** send retry count header ([#533](https://github.com/anthropics/anthropic-sdk-typescript/issues/533)) ([401b81c](https://github.com/anthropics/anthropic-sdk-typescript/commit/401b81c55c1f998dc917fc268884c162f214df20))
+
+
+### Bug Fixes
+
+* **types:** remove leftover polyfill usage ([#532](https://github.com/anthropics/anthropic-sdk-typescript/issues/532)) ([ac188b2](https://github.com/anthropics/anthropic-sdk-typescript/commit/ac188b29670d409c15e740bca26f8ef488cb7d05))
+
+
+### Chores
+
+* better object fallback behaviour for casting errors ([#503](https://github.com/anthropics/anthropic-sdk-typescript/issues/503)) ([3660e97](https://github.com/anthropics/anthropic-sdk-typescript/commit/3660e977e7127b10446b24b0a76b0133b3f666de))
+* better object fallback behaviour for casting errors ([#526](https://github.com/anthropics/anthropic-sdk-typescript/issues/526)) ([4ffb2e4](https://github.com/anthropics/anthropic-sdk-typescript/commit/4ffb2e4e1f5fef3ae58d9f4c99a63e75dd459c5b))
+* **internal:** add dev dependency ([#531](https://github.com/anthropics/anthropic-sdk-typescript/issues/531)) ([a9c127b](https://github.com/anthropics/anthropic-sdk-typescript/commit/a9c127b2854d0cf7efd49e7d46ff10fe52372949))
+
+
+### Documentation
+
+* improve and reference contributing documentation ([#539](https://github.com/anthropics/anthropic-sdk-typescript/issues/539)) ([cbef925](https://github.com/anthropics/anthropic-sdk-typescript/commit/cbef925519c63f09626ea7aa61ab8ba9d36bc35d))
+* update CONTRIBUTING.md ([#528](https://github.com/anthropics/anthropic-sdk-typescript/issues/528)) ([2609dec](https://github.com/anthropics/anthropic-sdk-typescript/commit/2609dec770d33b828c957e431f2d03871e67e629))
+
 ## 0.27.3 (2024-09-09)
 
 Full Changelog: [sdk-v0.27.2...sdk-v0.27.3](https://github.com/anthropics/anthropic-sdk-typescript/compare/sdk-v0.27.2...sdk-v0.27.3)
diff --git a/package.json b/package.json
index fc73a85d..e3b67db5 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@anthropic-ai/sdk",
-  "version": "0.27.3",
+  "version": "0.28.0",
   "description": "The official TypeScript library for the Anthropic API",
   "author": "Anthropic <support@anthropic.com>",
   "types": "dist/index.d.ts",
diff --git a/packages/bedrock-sdk/CHANGELOG.md b/packages/bedrock-sdk/CHANGELOG.md
index d1a6ac21..0ee2655a 100644
--- a/packages/bedrock-sdk/CHANGELOG.md
+++ b/packages/bedrock-sdk/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## 0.10.3 (2024-10-04)
+
+Full Changelog: [bedrock-sdk-v0.10.2...bedrock-sdk-v0.10.3](https://github.com/anthropics/anthropic-sdk-typescript/compare/bedrock-sdk-v0.10.2...bedrock-sdk-v0.10.3)
+
+### Chores
+
+* better object fallback behaviour for casting errors ([#526](https://github.com/anthropics/anthropic-sdk-typescript/issues/526)) ([4ffb2e4](https://github.com/anthropics/anthropic-sdk-typescript/commit/4ffb2e4e1f5fef3ae58d9f4c99a63e75dd459c5b))
+
 ## 0.10.2 (2024-07-29)
 
 Full Changelog: [bedrock-sdk-v0.10.1...bedrock-sdk-v0.10.2](https://github.com/anthropics/anthropic-sdk-typescript/compare/bedrock-sdk-v0.10.1...bedrock-sdk-v0.10.2)
diff --git a/packages/bedrock-sdk/package.json b/packages/bedrock-sdk/package.json
index 140f7151..50bfe1ed 100644
--- a/packages/bedrock-sdk/package.json
+++ b/packages/bedrock-sdk/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@anthropic-ai/bedrock-sdk",
-  "version": "0.10.2",
+  "version": "0.10.3",
   "description": "The official TypeScript library for the Anthropic Bedrock API",
   "author": "Anthropic <support@anthropic.com>",
   "types": "dist/index.d.ts",
diff --git a/packages/bedrock-sdk/yarn.lock b/packages/bedrock-sdk/yarn.lock
index b642a4ff..2593fcb6 100644
--- a/packages/bedrock-sdk/yarn.lock
+++ b/packages/bedrock-sdk/yarn.lock
@@ -17,7 +17,7 @@
 
 "@anthropic-ai/sdk@file:../../dist":
   # x-release-please-start-version
-  version "0.27.3"
+  version "0.28.0"
   # x-release-please-end-version
   dependencies:
     "@types/node" "^18.11.18"
diff --git a/packages/vertex-sdk/CHANGELOG.md b/packages/vertex-sdk/CHANGELOG.md
index e312f5b6..961ab4ea 100644
--- a/packages/vertex-sdk/CHANGELOG.md
+++ b/packages/vertex-sdk/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## 0.4.2 (2024-10-04)
+
+Full Changelog: [vertex-sdk-v0.4.1...vertex-sdk-v0.4.2](https://github.com/anthropics/anthropic-sdk-typescript/compare/vertex-sdk-v0.4.1...vertex-sdk-v0.4.2)
+
+### Chores
+
+* better object fallback behaviour for casting errors ([#526](https://github.com/anthropics/anthropic-sdk-typescript/issues/526)) ([4ffb2e4](https://github.com/anthropics/anthropic-sdk-typescript/commit/4ffb2e4e1f5fef3ae58d9f4c99a63e75dd459c5b))
+
 ## 0.4.1 (2024-07-29)
 
 Full Changelog: [vertex-sdk-v0.4.0...vertex-sdk-v0.4.1](https://github.com/anthropics/anthropic-sdk-typescript/compare/vertex-sdk-v0.4.0...vertex-sdk-v0.4.1)
diff --git a/packages/vertex-sdk/package.json b/packages/vertex-sdk/package.json
index 6e3c3c53..99817912 100644
--- a/packages/vertex-sdk/package.json
+++ b/packages/vertex-sdk/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@anthropic-ai/vertex-sdk",
-  "version": "0.4.1",
+  "version": "0.4.2",
   "description": "The official TypeScript library for the Anthropic Vertex API",
   "author": "Anthropic <support@anthropic.com>",
   "types": "dist/index.d.ts",
diff --git a/packages/vertex-sdk/yarn.lock b/packages/vertex-sdk/yarn.lock
index 8aac176d..e405f5e3 100644
--- a/packages/vertex-sdk/yarn.lock
+++ b/packages/vertex-sdk/yarn.lock
@@ -17,7 +17,7 @@
 
 "@anthropic-ai/sdk@file:../../dist":
   # x-release-please-start-version
-  version "0.27.3"
+  version "0.28.0"
   # x-release-please-end-version
   dependencies:
     "@types/node" "^18.11.18"
diff --git a/src/version.ts b/src/version.ts
index e741f3a2..3e76cc42 100644
--- a/src/version.ts
+++ b/src/version.ts
@@ -1 +1 @@
-export const VERSION = '0.27.3'; // x-release-please-version
+export const VERSION = '0.28.0'; // x-release-please-version