diff --git a/SkredvarselGarminWeb/Dockerfile b/SkredvarselGarminWeb/Dockerfile
index 73b97d9f..13af8b95 100644
--- a/SkredvarselGarminWeb/Dockerfile
+++ b/SkredvarselGarminWeb/Dockerfile
@@ -1,4 +1,4 @@
-FROM mcr.microsoft.com/dotnet/sdk:8.0.401-1-bookworm-slim AS base
+FROM mcr.microsoft.com/dotnet/sdk:9.0.100-bookworm-slim AS base
 RUN apt-get update
 RUN apt-get install -y ca-certificates curl gnupg
 RUN mkdir -p /etc/apt/keyrings
@@ -16,7 +16,7 @@ COPY . .
 RUN dotnet test
 RUN dotnet publish SkredvarselGarminWeb -c Release -o publish
 
-FROM mcr.microsoft.com/dotnet/sdk:8.0.401-1-bookworm-slim
+FROM mcr.microsoft.com/dotnet/sdk:9.0.100-bookworm-slim
 EXPOSE 8080
 WORKDIR /app
 COPY --from=builder /app/publish ./
diff --git a/SkredvarselGarminWeb/SkredvarselGarminWeb.Tests/SkredvarselGarminWeb.Tests.csproj b/SkredvarselGarminWeb/SkredvarselGarminWeb.Tests/SkredvarselGarminWeb.Tests.csproj
index 1cad66c6..98febb5b 100644
--- a/SkredvarselGarminWeb/SkredvarselGarminWeb.Tests/SkredvarselGarminWeb.Tests.csproj
+++ b/SkredvarselGarminWeb/SkredvarselGarminWeb.Tests/SkredvarselGarminWeb.Tests.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
 
@@ -10,9 +10,9 @@
 
   <ItemGroup>
     <PackageReference Include="AutoFixture" Version="4.18.1" />
-    <PackageReference Include="FluentAssertions" Version="6.12.2" />
-    <PackageReference Include="Microsoft.EntityFrameworkCore.InMemory" Version="8.0.10" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.11.1" />
+    <PackageReference Include="FluentAssertions" Version="7.0.0" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.InMemory" Version="9.0.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
     <PackageReference Include="NSubstitute" Version="5.3.0" />
     <PackageReference Include="xunit" Version="2.9.2" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2">
diff --git a/SkredvarselGarminWeb/SkredvarselGarminWeb/Endpoints/StripeSubscriptionEndpointsRouteBuilderExtensions.cs b/SkredvarselGarminWeb/SkredvarselGarminWeb/Endpoints/StripeSubscriptionEndpointsRouteBuilderExtensions.cs
index 813d85c9..fb597f40 100644
--- a/SkredvarselGarminWeb/SkredvarselGarminWeb/Endpoints/StripeSubscriptionEndpointsRouteBuilderExtensions.cs
+++ b/SkredvarselGarminWeb/SkredvarselGarminWeb/Endpoints/StripeSubscriptionEndpointsRouteBuilderExtensions.cs
@@ -42,7 +42,7 @@ public static void MapStripeSubscriptionEndpoints(this IEndpointRouteBuilder app
                 SuccessUrl = $"{baseUrl}/stripe-subscribe-callback?session_id={{CHECKOUT_SESSION_ID}}",
                 CancelUrl = $"{baseUrl}/account",
                 Mode = "subscription",
-                CustomerEmail = user.StripeCustomerId.IsNullOrEmpty() ? user.Email : null,
+                CustomerEmail = string.IsNullOrEmpty(user.StripeCustomerId) ? user.Email : null,
                 Customer = user.StripeCustomerId,
                 ClientReferenceId = user.Id,
                 LineItems = [
diff --git a/SkredvarselGarminWeb/SkredvarselGarminWeb/Endpoints/WatchApiRouteBuilderExtensions.cs b/SkredvarselGarminWeb/SkredvarselGarminWeb/Endpoints/WatchApiRouteBuilderExtensions.cs
index 7790bc5f..ae6c5994 100644
--- a/SkredvarselGarminWeb/SkredvarselGarminWeb/Endpoints/WatchApiRouteBuilderExtensions.cs
+++ b/SkredvarselGarminWeb/SkredvarselGarminWeb/Endpoints/WatchApiRouteBuilderExtensions.cs
@@ -74,7 +74,7 @@ public static void MapWatchApiEndpoints(this IEndpointRouteBuilder app)
             [FromHeader(Name = "Authorization")] string authorizationHeader,
             IGarminAuthenticationService garminAuthenticationService) =>
         {
-            if (authorizationHeader.IsNullOrEmpty())
+            if (string.IsNullOrEmpty(authorizationHeader))
             {
                 return Results.Unauthorized();
             }
diff --git a/SkredvarselGarminWeb/SkredvarselGarminWeb/SkredvarselGarminWeb.csproj b/SkredvarselGarminWeb/SkredvarselGarminWeb/SkredvarselGarminWeb.csproj
index 96d06550..0a443a7d 100644
--- a/SkredvarselGarminWeb/SkredvarselGarminWeb/SkredvarselGarminWeb.csproj
+++ b/SkredvarselGarminWeb/SkredvarselGarminWeb/SkredvarselGarminWeb.csproj
@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk.Web">
   <PropertyGroup>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <Nullable>enable</Nullable>
     <ImplicitUsings>enable</ImplicitUsings>
     <SpaRoot>Frontend\</SpaRoot>
@@ -9,38 +9,36 @@
     <SpaProxyLaunchCommand>npm run dev</SpaProxyLaunchCommand>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="EFCore.NamingConventions" Version="8.0.3" />
-    <PackageReference Include="Hangfire.AspNetCore" Version="1.8.15" />
-    <PackageReference Include="Hangfire.Core" Version="1.8.15" />
+    <PackageReference Include="EFCore.NamingConventions" Version="9.0.0" />
+    <PackageReference Include="Hangfire.AspNetCore" Version="1.8.17" />
+    <PackageReference Include="Hangfire.Core" Version="1.8.17" />
     <PackageReference Include="Hangfire.PostgreSql" Version="1.20.10" />
     <PackageReference Include="Macross.Json.Extensions" Version="3.0.0" />
-    <PackageReference Include="Microsoft.AspNetCore.Authentication" Version="2.2.0" />
-    <PackageReference Include="Microsoft.AspNetCore.Authentication.Cookies" Version="2.2.0" />
-    <PackageReference Include="Microsoft.AspNetCore.Authentication.Facebook" Version="8.0.10" />
-    <PackageReference Include="Microsoft.AspNetCore.Authentication.Google" Version="8.0.10" />
-    <PackageReference Include="Microsoft.AspNetCore.Authentication.OpenIdConnect" Version="8.0.10" />
-    <PackageReference Include="Microsoft.AspNetCore.SpaProxy" Version="8.0.10" />
-    <PackageReference Include="Microsoft.AspNetCore.SpaServices.Extensions" Version="8.0.10" />
-    <PackageReference Include="Microsoft.EntityFrameworkCore" Version="8.0.10" />
-    <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="8.0.10">
+    <PackageReference Include="Microsoft.AspNetCore.Authentication.Facebook" Version="9.0.0" />
+    <PackageReference Include="Microsoft.AspNetCore.Authentication.Google" Version="9.0.0" />
+    <PackageReference Include="Microsoft.AspNetCore.Authentication.OpenIdConnect" Version="9.0.0" />
+    <PackageReference Include="Microsoft.AspNetCore.SpaProxy" Version="9.0.0" />
+    <PackageReference Include="Microsoft.AspNetCore.SpaServices.Extensions" Version="9.0.0" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore" Version="9.0.0" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="9.0.0">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
-    <PackageReference Include="Microsoft.EntityFrameworkCore.Relational" Version="8.0.10" />
-    <PackageReference Include="Microsoft.Extensions.Caching.Memory" Version="8.0.1" />
-    <PackageReference Include="Microsoft.Extensions.Http.Polly" Version="8.0.10" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Relational" Version="9.0.0" />
+    <PackageReference Include="Microsoft.Extensions.Caching.Memory" Version="9.0.0" />
+    <PackageReference Include="Microsoft.Extensions.Http.Polly" Version="9.0.0" />
     <PackageReference Include="NetTopologySuite" Version="2.5.0" />
     <PackageReference Include="NetTopologySuite.IO.GeoJSON" Version="4.0.0" />
     <PackageReference Include="NetTopologySuite.IO.GeoJSON4STJ" Version="4.0.0" />
-    <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="8.0.10" />
-    <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL.NetTopologySuite" Version="8.0.10" />
-    <PackageReference Include="Polly" Version="8.4.2" />
+    <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="9.0.2" />
+    <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL.NetTopologySuite" Version="9.0.2" />
+    <PackageReference Include="Polly" Version="8.5.0" />
     <PackageReference Include="ProjNet4GeoAPI" Version="1.4.1" />
     <PackageReference Include="Refit" Version="8.0.0" />
     <PackageReference Include="Refit.HttpClientFactory" Version="8.0.0" />
     <PackageReference Include="Resend" Version="0.0.8" />
-    <PackageReference Include="Stripe.net" Version="47.0.0" />
-    <PackageReference Include="Swashbuckle.AspNetCore" Version="6.9.0" />
+    <PackageReference Include="Stripe.net" Version="47.1.0" />
+    <PackageReference Include="Swashbuckle.AspNetCore" Version="7.1.0" />
   </ItemGroup>
   <ItemGroup>
     <!-- Don't publish the SPA source files, but do show them in the project files list -->