diff --git a/src/ReactiveMarbles.CacheDatabase.Core/ReactiveMarbles.CacheDatabase.Core.csproj b/src/ReactiveMarbles.CacheDatabase.Core/ReactiveMarbles.CacheDatabase.Core.csproj
index da6c90f..a0b5d80 100644
--- a/src/ReactiveMarbles.CacheDatabase.Core/ReactiveMarbles.CacheDatabase.Core.csproj
+++ b/src/ReactiveMarbles.CacheDatabase.Core/ReactiveMarbles.CacheDatabase.Core.csproj
@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <TargetFrameworks>netstandard2.0;net6.0;net7.0</TargetFrameworks>
@@ -8,6 +8,6 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.Bcl.AsyncInterfaces" Version="7.0.0" />
-    <PackageReference Include="System.Reactive" Version="5.0.0" />
+    <PackageReference Include="System.Reactive" Version="6.0.0" />
   </ItemGroup>
 </Project>