diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 9127b1bd5..25709d1be 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "3.9.0"
+  ".": "3.10.0"
 }
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 558c2a93f..1e5cdc271 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,17 @@
 # Changelog
 
+## [3.10.0](https://github.com/microsoft/OpenAPI.NET/compare/v3.9.0...v3.10.0) (2026-08-11)
+
+
+### Features
+
+* do not ignore multiple types when serializing to 3.0 ([#2960](https://github.com/microsoft/OpenAPI.NET/issues/2960)) ([ebaf27a](https://github.com/microsoft/OpenAPI.NET/commit/ebaf27ac46f8820e7b817cc33e693632c2fc908a))
+
+
+### Bug Fixes
+
+* bound YAML anchor/alias expansion to prevent OOM (billion laughs) ([#3000](https://github.com/microsoft/OpenAPI.NET/issues/3000)) ([2179326](https://github.com/microsoft/OpenAPI.NET/commit/21793261d6860fb6e607b71fd95c0bd320724764))
+
 ## [3.9.0](https://github.com/microsoft/OpenAPI.NET/compare/v3.8.0...v3.9.0) (2026-07-15)
 
 
diff --git a/Directory.Build.props b/Directory.Build.props
index aec9507b2..aec0c52e9 100644
--- a/Directory.Build.props
+++ b/Directory.Build.props
@@ -12,7 +12,7 @@
     <PackageProjectUrl>https://github.com/Microsoft/OpenAPI.NET</PackageProjectUrl>
     <Copyright>© Microsoft Corporation. All rights reserved.</Copyright>
     <PackageTags>OpenAPI .NET</PackageTags>
-    <Version>3.9.0</Version>
+    <Version>3.10.0</Version>
   </PropertyGroup>
   <!-- https://github.com/clairernovotny/DeterministicBuilds#deterministic-builds -->
   <PropertyGroup Condition="'$(TF_BUILD)' == 'true'">