Package, Target Framework, and Dependency Changes

July 31, 2026 · View on GitHub

When to read this: Read this for NuGet package renames / additions / removals, the new published packages, target-framework changes on Opc.Ua.Types, and the Newtonsoft.Json removal from Opc.Ua.Core.

New published packages

Two assemblies that previously shipped only as transitive content inside Opc.Ua.Core are now published as standalone NuGet packages. Add an explicit <PackageReference> only if your project depends on these types without also depending on Opc.Ua.Core (which still includes them transitively).

OPCFoundation.NetStandard.Opc.Ua.Core.Types (project src/Opc.Ua.Core.Types/Opc.Ua.Core.Types.csproj, IsPackable=true, target frameworks $(LibCoreTargetFrameworks)). Owns the framework-neutral built-in type and node-state contracts. Headline public types include IServiceRequest, IServiceResponse, BaseEventState, EventSeverity, InstanceStateSnapshot, FolderState, FolderTypeState, LimitAlarmStates, ContentFilter (including Result / ElementResult), and MonitoringFilter / MonitoringFilterResult.

<PackageReference Include="OPCFoundation.NetStandard.Opc.Ua.Core.Types" Version="2.0.*" />

OPCFoundation.NetStandard.Opc.Ua.Security.Certificates (project src/Opc.Ua.Security.Certificates/Opc.Ua.Security.Certificates.csproj, IsPackable=true, target frameworks $(LibCoreTargetFrameworks)). Owns the wrapper certificate type system. Headline public types: Certificate, CertificateCollection, IX509Certificate, ICertificateFactory, ICertificateIssuer, CertificateChangeKind, X509AuthorityKeyIdentifierExtension, X509CrlNumberExtension, X509SubjectAltNameExtension, CRLReason.

<PackageReference Include="OPCFoundation.NetStandard.Opc.Ua.Security.Certificates" Version="2.0.*" />

Target Frameworks (only Opc.Ua.Types changes)

The TFM matrix for the main libraries (Core, Client, Server, Configuration, etc.) is unchanged from 1.5.378: net472;net48;netstandard2.1;net8.0;net9.0;net10.0. The only consumer-visible change is the Opc.Ua.Types assembly: on 1.5.378 it tracked the dedicated LibTypesTargetFrameworks variable (net472;net48;netstandard2.0;netstandard2.1;net8.0;net9.0;net10.0); on 2.0 the variable is removed and Opc.Ua.Types tracks LibCoreTargetFrameworks, the same matrix as every other library. The net effect is that netstandard2.0 is no longer offered for Opc.Ua.Types.

The minimum SDK is the .NET 10 SDK, and projects compile with LangVersion 14.0. Projects that target netstandard2.0 and pull in Opc.Ua.Types will fail to restore with NU1202 ("package is not compatible") - retarget to netstandard2.1 or one of the .NET / .NET Framework TFMs above.

NuGet dependency additions and removals

PackageStatus in 2.0First introduced in
DotNext 5.26.3Addedsrc/Opc.Ua.Lds.Server/Opc.Ua.Lds.Server.csproj
Makaretu.Dns.Multicast 0.27.0Added (pinned)Centralised pin; previously vendored in-tree, no direct reference yet
Microsoft.Bcl.TimeProvider 10.0.8Added (pinned)Centralised pin; transitive use for TimeProvider on net472/net48
Microsoft.CodeAnalysis.Analyzers 4.14.0Addedsrc/Opc.Ua.Core/Opc.Ua.Core.csproj (runtime source-generation surface)
Microsoft.CodeAnalysis.Common 4.14.0Addedsrc/Opc.Ua.Core/Opc.Ua.Core.csproj
Microsoft.CodeAnalysis.CSharp 5.3.0Addedsrc/Opc.Ua.Core/Opc.Ua.Core.csproj
Microsoft.Extensions.Configuration.Abstractions 10.0.8Added (pinned)Used by dependency injection integration
Microsoft.Extensions.Diagnostics 10.0.8Added (pinned)Centralised pin
Microsoft.Extensions.Hosting 10.0.8Added (pinned)Centralised pin
Microsoft.Extensions.Hosting.Abstractions 10.0.8Added (pinned)Centralised pin
Microsoft.Extensions.Options 10.0.8Added (pinned)Centralised pin
Microsoft.Extensions.Options.ConfigurationExtensions 10.0.8Added (pinned)Centralised pin
ModelContextProtocol 1.3.0Addedtools/Opc.Ua.Mcp/Opc.Ua.Mcp.csproj
ModelContextProtocol.AspNetCore 1.3.0Addedtools/Opc.Ua.Mcp/Opc.Ua.Mcp.csproj
System.CommandLine 2.0.8Addedtools/Opc.Ua.Mcp/Opc.Ua.Mcp.csproj
System.Threading.Channels 10.0.8Addedsrc/Opc.Ua.Lds.Server/Opc.Ua.Lds.Server.csproj
TUnit 1.45.8Added (test-only)tests/Opc.Ua.Server.Tests/Opc.Ua.Server.Tests.csproj
NUnit.Analyzers 4.13.0Added (test-only)Test projects
ObjectLayoutInspector 0.2.0Added (test-only)Test projects
System.Reflection.Metadata 10.0.6Added (test-only)Test projects
Mono.Options 6.12.0.148RemovedPreviously referenced by samples/ConsoleReferenceServer/MonoReferenceServer.csproj

Newtonsoft.Json - what really changed

Newtonsoft.Json was removed as a direct dependency of src/Opc.Ua.Core/Opc.Ua.Core.csproj in 2.0. The only direct <PackageReference Include="Newtonsoft.Json" ... /> remaining anywhere under src/ and src/ is in src/Opc.Ua.PubSub/Opc.Ua.PubSub.csproj. Consequences:

  • Consumers that reached Newtonsoft.Json only transitively through Opc.Ua.Core now need to add their own explicit reference.
  • Consumers of Opc.Ua.PubSub continue to receive Newtonsoft.Json transitively and are unaffected.
<PackageReference Include="Newtonsoft.Json" Version="13.0.4" />

Use Version="13.0.4" or any compatible later 13.x release.

See also