diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index cb33ae9..03ea6f4 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1 +1 @@
-{"src/Altinn.Urn":"2.5.1","src/Altinn.Swashbuckle":"2.1.1","src/Altinn.Authorization.ProblemDetails":"3.0.1","src/Altinn.Authorization.ServiceDefaults":"2.7.0","src/Altinn.Cli":"1.1.0"}
+{"src/Altinn.Urn":"2.5.1","src/Altinn.Swashbuckle":"2.1.1","src/Altinn.Authorization.ProblemDetails":"3.1.0","src/Altinn.Authorization.ServiceDefaults":"2.7.0","src/Altinn.Cli":"1.1.0"}
diff --git a/src/Altinn.Authorization.ProblemDetails/CHANGELOG.md b/src/Altinn.Authorization.ProblemDetails/CHANGELOG.md
index c1b830b..72f2e88 100644
--- a/src/Altinn.Authorization.ProblemDetails/CHANGELOG.md
+++ b/src/Altinn.Authorization.ProblemDetails/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## [3.1.0](https://github.com/Altinn/altinn-authorization-utils/compare/Altinn.Authorization.ProblemDetails-v3.0.1...Altinn.Authorization.ProblemDetails-v3.1.0) (2024-12-06)
+
+
+### Features
+
+* upgrade to .NET 9 ([#166](https://github.com/Altinn/altinn-authorization-utils/issues/166)) ([867c940](https://github.com/Altinn/altinn-authorization-utils/commit/867c9400ac8fd9a37c71d0af6386fbb414523267))
+
 ## [3.0.1](https://github.com/Altinn/altinn-authorization-utils/compare/Altinn.Authorization.ProblemDetails-v3.0.0...Altinn.Authorization.ProblemDetails-v3.0.1) (2024-08-27)
 
 
diff --git a/src/Altinn.Authorization.ProblemDetails/Version.props b/src/Altinn.Authorization.ProblemDetails/Version.props
index f8d75c1..e66a260 100644
--- a/src/Altinn.Authorization.ProblemDetails/Version.props
+++ b/src/Altinn.Authorization.ProblemDetails/Version.props
@@ -1,7 +1,7 @@
 <Project>
 
   <PropertyGroup>
-    <Version>0.0.0</Version>
+    <Version>3.1.0</Version>
   </PropertyGroup>
 
 </Project>
diff --git a/src/Altinn.Authorization.ProblemDetails/version.txt b/src/Altinn.Authorization.ProblemDetails/version.txt
index cb2b00e..fd2a018 100644
--- a/src/Altinn.Authorization.ProblemDetails/version.txt
+++ b/src/Altinn.Authorization.ProblemDetails/version.txt
@@ -1 +1 @@
-3.0.1
+3.1.0