diff --git a/.github/workflows/build-analyze.yml b/.github/workflows/build-analyze.yml
index 0707e1e..2765262 100644
--- a/.github/workflows/build-analyze.yml
+++ b/.github/workflows/build-analyze.yml
@@ -21,7 +21,7 @@ jobs:
         uses: actions/setup-dotnet@v4
         with:
           dotnet-version: |
-            8.0.x
+            9.0.x
       - name: Build & Test
         run: |
            dotnet build Altinn.Auth.AuditLog.sln -v m
@@ -35,7 +35,7 @@ jobs:
         uses: actions/setup-dotnet@v4
         with:
           dotnet-version: |
-            8.0.x
+            9.0.x
       - name: Set up JDK 11
         uses: actions/setup-java@v4
         with:
diff --git a/.github/workflows/build-deploy-at.yml b/.github/workflows/build-deploy-at.yml
index a9ce96b..bfb3225 100644
--- a/.github/workflows/build-deploy-at.yml
+++ b/.github/workflows/build-deploy-at.yml
@@ -5,7 +5,7 @@ on:
   workflow_dispatch:
 
 env:
-  DOTNET_VERSION: '8.0.x'
+  DOTNET_VERSION: '9.0.x'
 
 jobs:
   build-container-app:
diff --git a/.github/workflows/deploy-after-release.yml b/.github/workflows/deploy-after-release.yml
index 62f5fda..39c762b 100644
--- a/.github/workflows/deploy-after-release.yml
+++ b/.github/workflows/deploy-after-release.yml
@@ -4,7 +4,7 @@ on:
     types: [released]
 
 env:
-  DOTNET_VERSION: '8.0.x'
+  DOTNET_VERSION: '9.0.x'
   REGISTRY: ghcr.io
   REPOSITORY: altinn/altinn-auth-audit-log
 
diff --git a/.github/workflows/manual-build-deploy-function-app-to-environment.yml b/.github/workflows/manual-build-deploy-function-app-to-environment.yml
index 72b2d00..f2c4938 100644
--- a/.github/workflows/manual-build-deploy-function-app-to-environment.yml
+++ b/.github/workflows/manual-build-deploy-function-app-to-environment.yml
@@ -11,7 +11,7 @@ on:
           description: The branch or tag to deploy
 
 env:
-  DOTNET_VERSION: '8.0.x'
+  DOTNET_VERSION: '9.0.x'
 
 jobs:
   build-function-app:
diff --git a/.github/workflows/manual-build-deploy-to-environment.yml b/.github/workflows/manual-build-deploy-to-environment.yml
index 8e46a58..9dc8c25 100644
--- a/.github/workflows/manual-build-deploy-to-environment.yml
+++ b/.github/workflows/manual-build-deploy-to-environment.yml
@@ -7,7 +7,7 @@ on:
           description: Select the environment
 
 env:
-  DOTNET_VERSION: '8.0.x'
+  DOTNET_VERSION: '9.0.x'
 
 jobs:
   build-container-app:
diff --git a/Dockerfile b/Dockerfile
index ac57902..e5fe6db 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 # Building the auditlog api
-FROM mcr.microsoft.com/dotnet/sdk:8.0-alpine AS build
+FROM mcr.microsoft.com/dotnet/sdk:9.0-alpine AS build
 ARG SOURCE_REVISION_ID=LOCALBUILD
 
 COPY src .
@@ -9,7 +9,7 @@ RUN dotnet build Altinn.Auth.AuditLog.csproj -c Release -o /app_output -p Source
 RUN dotnet publish Altinn.Auth.AuditLog.csproj -c Release -o /app_output -p SourceRevisionId=${SOURCE_REVISION_ID}
 
 # Building the final image
-FROM mcr.microsoft.com/dotnet/aspnet:8.0-alpine AS final
+FROM mcr.microsoft.com/dotnet/aspnet:9.0-alpine AS final
 EXPOSE 5166
 WORKDIR /app
 COPY --from=build /app_output .
diff --git a/README.md b/README.md
index 864e850..325185e 100644
--- a/README.md
+++ b/README.md
@@ -27,7 +27,7 @@ The auditlog api maps the events to the database model and stores them in the da
 The events are stored in the postgres database.
 
 ## Technologies
-  - .NET 8.0
+  - .NET 9.0
   - Azure Storage Queue
   - Azure Function App V4
   - Azure Container App
diff --git a/src/Altinn.Auth.AuditLog/Dockerfile b/src/Altinn.Auth.AuditLog/Dockerfile
index f8178c3..037670c 100644
--- a/src/Altinn.Auth.AuditLog/Dockerfile
+++ b/src/Altinn.Auth.AuditLog/Dockerfile
@@ -1,11 +1,11 @@
 #See https://aka.ms/customizecontainer to learn how to customize your debug container and how Visual Studio uses this Dockerfile to build your images for faster debugging.
 
-FROM mcr.microsoft.com/dotnet/aspnet:8.0 AS base
+FROM mcr.microsoft.com/dotnet/aspnet:9.0 AS base
 WORKDIR /app
 EXPOSE 80
 EXPOSE 443
 
-FROM mcr.microsoft.com/dotnet/sdk:8.0 AS build
+FROM mcr.microsoft.com/dotnet/sdk:9.0 AS build
 WORKDIR /src
 COPY ["Altinn.Auth.AuditLog/Altinn.Auth.AuditLog.csproj", "Altinn.Auth.AuditLog/"]
 RUN dotnet restore "Altinn.Auth.AuditLog/Altinn.Auth.AuditLog.csproj"