diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 5d9ceab581..2dfeb2d9bb 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "1.99.8"
+  ".": "1.99.9"
 }
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 33e0e8e948..392fb8b667 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## 1.99.9 (2025-08-12)
+
+Full Changelog: [v1.99.8...v1.99.9](https://github.com/openai/openai-python/compare/v1.99.8...v1.99.9)
+
+### Bug Fixes
+
+* **types:** actually fix ChatCompletionMessageToolCall type ([20cb0c8](https://github.com/openai/openai-python/commit/20cb0c86d598e196386ff43db992f6497eb756d0))
+
 ## 1.99.8 (2025-08-11)
 
 Full Changelog: [v1.99.7...v1.99.8](https://github.com/openai/openai-python/compare/v1.99.7...v1.99.8)
diff --git a/pyproject.toml b/pyproject.toml
index b4a7d01a2b..ced6079b6d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "openai"
-version = "1.99.8"
+version = "1.99.9"
 description = "The official Python library for the openai API"
 dynamic = ["readme"]
 license = "Apache-2.0"
diff --git a/src/openai/_version.py b/src/openai/_version.py
index 9d1f1f4e96..7d3b3da5d7 100644
--- a/src/openai/_version.py
+++ b/src/openai/_version.py
@@ -1,4 +1,4 @@
 # File generated from our OpenAPI spec by Stainless. See CONTRIBUTING.md for details.
 
 __title__ = "openai"
-__version__ = "1.99.8"  # x-release-please-version
+__version__ = "1.99.9"  # x-release-please-version
diff --git a/src/openai/types/chat/chat_completion_message_tool_call.py b/src/openai/types/chat/chat_completion_message_tool_call.py
index 845e639089..71ac63f58e 100644
--- a/src/openai/types/chat/chat_completion_message_tool_call.py
+++ b/src/openai/types/chat/chat_completion_message_tool_call.py
@@ -14,4 +14,4 @@
     PropertyInfo(discriminator="type"),
 ]
 
-ChatCompletionMessageToolCall: TypeAlias = ChatCompletionMessageToolCallUnion
+ChatCompletionMessageToolCall: TypeAlias = ChatCompletionMessageFunctionToolCall