diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 099626f..4fcfdf7 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "1.8.0"
+  ".": "1.9.0"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index ed90ddb..7af9704 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## 1.9.0 (2024-06-24)
+
+Full Changelog: [v1.8.0...v1.9.0](https://github.com/prompt-foundry/typescript-sdk/compare/v1.8.0...v1.9.0)
+
+### Features
+
+* **api:** OpenAPI spec update via Stainless API ([#61](https://github.com/prompt-foundry/typescript-sdk/issues/61)) ([4c1bc5f](https://github.com/prompt-foundry/typescript-sdk/commit/4c1bc5fd559a5cfa6fdbd7365c5b9752cc30c6ce))
+
 ## 1.8.0 (2024-06-19)
 
 Full Changelog: [v1.7.0...v1.8.0](https://github.com/prompt-foundry/typescript-sdk/compare/v1.7.0...v1.8.0)
diff --git a/package.json b/package.json
index 124f294..0b9ae88 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@prompt-foundry/typescript-sdk",
-  "version": "1.8.0",
+  "version": "1.9.0",
   "description": "The prompt engineering, prompt management, and prompt evaluation tool for TypeScript, JavaScript, and NodeJS.",
   "keywords": [
     "typescript",
diff --git a/src/version.ts b/src/version.ts
index 29d3ce7..d6d803f 100644
--- a/src/version.ts
+++ b/src/version.ts
@@ -1 +1 @@
-export const VERSION = '1.8.0'; // x-release-please-version
+export const VERSION = '1.9.0'; // x-release-please-version