diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 573f090..e6f8775 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "3.8.0"
+  ".": "4.0.0"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index dc530be..6ecade6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,27 @@
 # Changelog
 
+## [4.0.0](https://github.com/jcamp-code/FluentEmail/compare/v3.8.0...v4.0.0) (2025-10-26)
+
+
+### ⚠ BREAKING CHANGES
+
+* changed to .net 8.0, 9.0, 10.0
+
+### ✨ Features
+
+* Added .net9.0 compatibility ([dbb57b4](https://github.com/jcamp-code/FluentEmail/commit/dbb57b4d90365b1f79cb8b1489ab40b7f6240426))
+* Adds CheckCertificateRevocation to mailkit smtp options ([fed435e](https://github.com/jcamp-code/FluentEmail/commit/fed435e0abbafcea6f0597b4a17ef834b20e3645)), closes [#27](https://github.com/jcamp-code/FluentEmail/issues/27)
+* Changed to .net 8.0, 9.0, 10.0 ([e1034c4](https://github.com/jcamp-code/FluentEmail/commit/e1034c46cf215e15fa9fcc51948055da04e67e01))
+
+
+### 🏡 Miscellaneous Chores
+
+* Initial release-please setup ([#34](https://github.com/jcamp-code/FluentEmail/issues/34)) ([3657e64](https://github.com/jcamp-code/FluentEmail/commit/3657e6418637a1fc5988560d9dac2df03d8fc353))
+* Update Bootstrap tests ([4a352fe](https://github.com/jcamp-code/FluentEmail/commit/4a352fea3fb36ce6e51c65d97b23f7aabb41ca1b))
+* Update icons ([3292af1](https://github.com/jcamp-code/FluentEmail/commit/3292af18edd3e0ee93d6cd54c862b72efe05e2b3))
+* Update RazorLight ([985766c](https://github.com/jcamp-code/FluentEmail/commit/985766cd491868e58f22b84be570a3c22c40f54e)), closes [#24](https://github.com/jcamp-code/FluentEmail/issues/24)
+* Update unit tests to xunit and Awesome Assertions ([#32](https://github.com/jcamp-code/FluentEmail/issues/32)) ([fe6f017](https://github.com/jcamp-code/FluentEmail/commit/fe6f017a82aa6bbd2911b61fa26e8dc527057466))
+
 ## v3.8.0
 
 [compare changes](https://github.com/jcamp-code/FluentEmail/compare/v3.7.0...v3.8.0)
diff --git a/src/Directory.Build.props b/src/Directory.Build.props
index 7ec6de9..7471980 100644
--- a/src/Directory.Build.props
+++ b/src/Directory.Build.props
@@ -11,7 +11,7 @@
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
     <PackageReadmeFile>README.md</PackageReadmeFile>
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
-    <Version>3.8.0</Version>
+    <Version>4.0.0</Version>
 
 
     <PublishRepositoryUrl>true</PublishRepositoryUrl>