diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index eb88d5ecc..20c5f9a7b 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "2.0.0-preview.19"
+  ".": "2.0.0-preview.20"
 }
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index ad924032e..0d355ed1d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,19 @@
 # Changelog
 
+## [2.0.0-preview.20](https://github.com/microsoft/OpenAPI.NET/compare/v2.0.0-preview.19...v2.0.0-preview.20) (2025-05-20)
+
+
+### Bug Fixes
+
+* nullable and type ordering should be maintain to ease up migration work ([6c82aa6](https://github.com/microsoft/OpenAPI.NET/commit/6c82aa6b2d6e4f39af3c594edd8590a0cf749530))
+* nullable should not be inserted as an attempt to normalize the document ([6c82aa6](https://github.com/microsoft/OpenAPI.NET/commit/6c82aa6b2d6e4f39af3c594edd8590a0cf749530))
+* refactor to avoid adding duplicate entries ([41fd508](https://github.com/microsoft/OpenAPI.NET/commit/41fd508074f1b70415026df3aa878cd5f5e7b1ee))
+* refactor to avoid adding duplicate entries ([#2359](https://github.com/microsoft/OpenAPI.NET/issues/2359)) ([9791eb6](https://github.com/microsoft/OpenAPI.NET/commit/9791eb684a0f040feeb8c58701fd4f3577e73e2c))
+* tree node has the wrong structure because of trailing slashes ([2ffb273](https://github.com/microsoft/OpenAPI.NET/commit/2ffb2735aa3718370d6094186142f9cf50b194fa))
+* tree node has the wrong structure because of trailing slashes ([4439340](https://github.com/microsoft/OpenAPI.NET/commit/443934060e1e446de726addde69a2de955b95a7b))
+* wrong link to json schema spec in schema doc comments ([d9b0c90](https://github.com/microsoft/OpenAPI.NET/commit/d9b0c906f7173b81fea15001d588edcbc3eed8f1))
+* wrong link to json schema spec in schema doc comments ([9a73ec6](https://github.com/microsoft/OpenAPI.NET/commit/9a73ec6e5486d84b6a30a5fa0ac5961b381fc3d3))
+
 ## [2.0.0-preview.19](https://github.com/microsoft/OpenAPI.NET/compare/v2.0.0-preview.18...v2.0.0-preview.19) (2025-05-16)
 
 
diff --git a/Directory.Build.props b/Directory.Build.props
index 9593fbee8..1b3fa5a79 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>2.0.0-preview.19</Version>
+    <Version>2.0.0-preview.20</Version>
   </PropertyGroup>
   <!-- https://github.com/clairernovotny/DeterministicBuilds#deterministic-builds -->
   <PropertyGroup Condition="'$(TF_BUILD)' == 'true'">