diff --git a/pkgs/development/python-modules/clr-loader/default.nix b/pkgs/development/python-modules/clr-loader/default.nix
index 90006a6fe44e..9bb57c046469 100644
--- a/pkgs/development/python-modules/clr-loader/default.nix
+++ b/pkgs/development/python-modules/clr-loader/default.nix
@@ -29,6 +29,7 @@ let
       "example/example.csproj"
     ];
     nugetDeps = ./deps.nix;
+    dotnet-sdk = dotnetCorePackages.sdk_6_0;
   };
 in
 buildPythonPackage {
diff --git a/pkgs/development/python-modules/pythonnet/default.nix b/pkgs/development/python-modules/pythonnet/default.nix
index ef97c0e1c477..2cadb7777415 100644
--- a/pkgs/development/python-modules/pythonnet/default.nix
+++ b/pkgs/development/python-modules/pythonnet/default.nix
@@ -28,6 +28,7 @@ let
     projectFile = "src/runtime/Python.Runtime.csproj";
     testProjectFile = "src/testing/Python.Test.csproj";
     nugetDeps = ./deps.nix;
+    dotnet-sdk = dotnet-sdk_6;
   };
 in
 buildPythonPackage {
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 4fa01e74c2a6..02fe78d397cc 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -418,14 +418,17 @@ with pkgs;
   dotnet-sdk_6 = dotnetCorePackages.sdk_6_0;
   dotnet-sdk_7 = dotnetCorePackages.sdk_7_0;
   dotnet-sdk_8 = dotnetCorePackages.sdk_8_0;
+  dotnet-sdk_9 = dotnetCorePackages.sdk_9_0;
 
   dotnet-runtime_6 = dotnetCorePackages.runtime_6_0;
   dotnet-runtime_7 = dotnetCorePackages.runtime_7_0;
   dotnet-runtime_8 = dotnetCorePackages.runtime_8_0;
+  dotnet-runtime_9 = dotnetCorePackages.runtime_9_0;
 
   dotnet-aspnetcore_6 = dotnetCorePackages.aspnetcore_6_0;
   dotnet-aspnetcore_7 = dotnetCorePackages.aspnetcore_7_0;
   dotnet-aspnetcore_8 = dotnetCorePackages.aspnetcore_8_0;
+  dotnet-aspnetcore_9 = dotnetCorePackages.aspnetcore_9_0;
 
   dotnet-sdk = dotnetCorePackages.sdk_8_0;
   dotnet-runtime = dotnetCorePackages.runtime_8_0;