diff --git a/CHANGELOG.md b/CHANGELOG.md
index 660b12e3..f91d1db4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,27 +1,40 @@
 # Release History
 
-## 2.0.0-beta.5 (Unreleased)
+## 2.0.0-beta.5 (2024-06-14)
 
 ## Features Added
 
-- API updates, current to [openai/openai-openapi@dd73070b](https://github.com/openai/openai-openapi/commit/dd73070b1d507645d24c249a63ebebd3ec38c0cb) ()
+- API updates, current to [openai/openai-openapi@dd73070b](https://github.com/openai/openai-openapi/commit/dd73070b1d507645d24c249a63ebebd3ec38c0cb) ([1af6569](https://github.com/openai/openai-dotnet/commit/1af6569e2ceae9d840b8826e42d7e3b2569b43f6))
   - This includes `MaxResults` for Assistants `FileSearchToolDefinition`, `ParallelToolCallsEnabled` for function tools in Assistants and Chat, and `FileChunkingStrategy` for Assistants VectorStores
+- Optional `CancellationToken` parameters are now directly present on most methods, eliminating the need to use protocol methods ([19a65a0](https://github.com/openai/openai-dotnet/commit/19a65a0a943fa3bef1ec8504708aaa526a1ee03a))
+
+## Bugs Fixed
+
+- ([#30](https://github.com/openai/openai-dotnet/issues/30)) Mitigated a .NET runtime issue that prevented chat message content and several other types from serializing correct on targets including mono and wasm ([896b9e0](https://github.com/openai/openai-dotnet/commit/896b9e0bc60f0ace90bd0d1af1254cf2680f8df6))
+- Assistants: Fixed an issue that threw an exception when receiving code interpreter run step logs when streaming a run ([207d597](https://github.com/openai/openai-dotnet/commit/207d59762e7eeb666b7ab2728a0bbee7c0cdd918))
+- Fixed a concurrency condition that could cause `multipart/form-data` requests to no longer generate random content part boundaries (no direct scenario impact) ([7cacdee](https://github.com/openai/openai-dotnet/commit/7cacdee2366df3cfa7e6c43bb050da54d23f8db9))
 
 ## Breaking Changes
 
 **Assistants**:
-- `InputQuote` is removed from Assistants `TextAnnotation` and `TextAnnotationUpdate`, per [openai/openai-openapi@dd73070b](https://github.com/openai/openai-openapi/commit/dd73070b1d507645d24c249a63ebebd3ec38c0cb) ()
+- `InputQuote` is removed from Assistants `TextAnnotation` and `TextAnnotationUpdate`, per [openai/openai-openapi@dd73070b](https://github.com/openai/openai-openapi/commit/dd73070b1d507645d24c249a63ebebd3ec38c0cb) ([1af6569](https://github.com/openai/openai-dotnet/commit/1af6569e2ceae9d840b8826e42d7e3b2569b43f6))
+
+## Other Changes
+
+- Added an environment-variable-based test project to the repository with baseline scenario coverage ([db6328a](https://github.com/openai/openai-dotnet/commit/db6328accdd7927f19915cdc5412eb841f2447c1))
+- Build/analyzer warnings cleaned up throughout the project ([45fc4d7](https://github.com/openai/openai-dotnet/commit/45fc4d72c12314aea83264ebe2e1dc18870e5c06), [b1fa082](https://github.com/openai/openai-dotnet/commit/b1fa0828a875906ef33ffe43ff1cd1a85fbd1a60), [22ab606](https://github.com/openai/openai-dotnet/commit/22ab606b867bbe0ea7f6918843dbc5e11dfe78eb))
+- Proactively aligned library's implementation of server-sent event (SSE) handling with the source of the incoming `System.Net.ServerSentEvents` namespace ([674e0f7](https://github.com/openai/openai-dotnet/commit/674e0f773b26a22eb039e879539c4c7a44fdffdd))
 
 ## 2.0.0-beta.4 (2024-06-10)
 
 ## Features Added
 
-- Added new, built-in helpers to simplify the use of text-only message content ([1c40de67](https://github.com/openai/openai-dotnet/commit/1c40de673a67ddf834b673aaabb94b2c42076e03))
+- Added new, built-in helpers to simplify the use of text-only message content ([1c40de6](https://github.com/openai/openai-dotnet/commit/1c40de673a67ddf834b673aaabb94b2c42076e03))
 
 ## Bugs Fixed
 
-- Optimized embedding deserialization and addressed correctness on big endian systems ([e28b5a77](https://github.com/openai/openai-dotnet/commit/e28b5a7787df4b1baa772406b09a0f650a45c77f))
-- Optimized b64_json message parsing via regex ([efd76b50](https://github.com/openai/openai-dotnet/commit/efd76b50f094c585350240aea051ba342c6f6622))
+- Optimized embedding deserialization and addressed correctness on big endian systems ([e28b5a7](https://github.com/openai/openai-dotnet/commit/e28b5a7787df4b1baa772406b09a0f650a45c77f))
+- Optimized b64_json message parsing via regex ([efd76b5](https://github.com/openai/openai-dotnet/commit/efd76b50f094c585350240aea051ba342c6f6622))
 
 ## 2.0.0-beta.3 (2024-06-07)
 
diff --git a/src/OpenAI.csproj b/src/OpenAI.csproj
index 6da549b4..6677e230 100644
--- a/src/OpenAI.csproj
+++ b/src/OpenAI.csproj
@@ -5,7 +5,7 @@
     <PackageTags>OpenAI</PackageTags>
 
     <VersionPrefix>2.0.0</VersionPrefix>
-    <VersionSuffix>beta.4</VersionSuffix>
+    <VersionSuffix>beta.5</VersionSuffix>
 
     <TargetFrameworks>netstandard2.0;net6.0</TargetFrameworks>
     <LangVersion>latest</LangVersion>