diff --git a/dotnet/CASE2GeoJSON.csproj b/dotnet/CASE2GeoJSON.csproj
index 1279247..346ae8f 100644
--- a/dotnet/CASE2GeoJSON.csproj
+++ b/dotnet/CASE2GeoJSON.csproj
@@ -8,7 +8,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="dotnetrdf" Version="3.3.2" />
+    <PackageReference Include="dotnetrdf" Version="3.4.0" />
     <PackageReference Include="newtonsoft.json" Version="13.0.3" />
   </ItemGroup>