diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 20c5f9a7b..903f84ef0 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "2.0.0-preview.20"
+  ".": "2.0.0-preview.21"
 }
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0d355ed1d..1e7d5ba52 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## [2.0.0-preview.21](https://github.com/microsoft/OpenAPI.NET/compare/v2.0.0-preview.20...v2.0.0-preview.21) (2025-05-21)
+
+
+### Bug Fixes
+
+* do not throw when operation tag is missing matching global tag ([fe133f2](https://github.com/microsoft/OpenAPI.NET/commit/fe133f2604e9b65cc1c7011aab7c62f44e649d19))
+* do not throw when operation tag is missing matching global tag ([2c5aa40](https://github.com/microsoft/OpenAPI.NET/commit/2c5aa40cbb8bf1e96c1ccce6273579e70b69ade2))
+
 ## [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)
 
 
diff --git a/Directory.Build.props b/Directory.Build.props
index 1b3fa5a79..4769cc44a 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.20</Version>
+    <Version>2.0.0-preview.21</Version>
   </PropertyGroup>
   <!-- https://github.com/clairernovotny/DeterministicBuilds#deterministic-builds -->
   <PropertyGroup Condition="'$(TF_BUILD)' == 'true'">