diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c03ddb4f..3e58386e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -88,7 +88,7 @@ jobs:
     strategy:
       matrix:
         os: ['ubuntu-latest', 'windows-latest']
-        python-version: ['3.9', '3.10', '3.11', '3.12', '3.x']
+        python-version: ['3.9', '3.10', '3.11', '3.12', '3.13']
         dotnet-version: ['8.0.x']
         dist: [whl, sdist]
     uses: ./.github/workflows/e2e.yml
diff --git a/src/data_factory_testing_framework/_pythonnet/__init__.py b/src/data_factory_testing_framework/_pythonnet/__init__.py
index 5986726b..65e29f99 100644
--- a/src/data_factory_testing_framework/_pythonnet/__init__.py
+++ b/src/data_factory_testing_framework/_pythonnet/__init__.py
@@ -10,9 +10,11 @@
 def load_dotnet_assemblies() -> None:
     # Load the .NET assemblies
     for dll in (Path(__file__).parent / "bin").glob("**/*.dll"):
-        dll = os.path.abspath(dll)
+        # Pass the path without the ".dll" suffix so pythonnet probes and loads "<path>.dll" directly.
+        # With the suffix, pythonnet 3.0.x on .NET 9+ parses the path as an assembly name and fails to load it.
+        assembly_path = os.path.splitext(os.path.abspath(dll))[0]
         try:
-            clr.AddReference(dll)
+            clr.AddReference(assembly_path)
         except Exception:
             pass