diff --git a/.forgejo/workflows/ci.yml b/.forgejo/workflows/ci.yml
index 4685e1d..0937187 100644
--- a/.forgejo/workflows/ci.yml
+++ b/.forgejo/workflows/ci.yml
@@ -11,8 +11,8 @@ env:
   # The OpenAC release whose AcDream.Plugin.Abstractions package this plugin
   # builds against. PluginApiPackageVersion in Directory.Build.props has to
   # name the same version.
-  OPENAC_API_RELEASE_TAG: v0.1.19
-  OPENAC_API_VERSION: 0.1.19
+  OPENAC_API_RELEASE_TAG: v0.1.21
+  OPENAC_API_VERSION: 0.1.21
 
 jobs:
   build-and-test:
diff --git a/Directory.Build.props b/Directory.Build.props
index 1d2b472..ff76fdd 100644
--- a/Directory.Build.props
+++ b/Directory.Build.props
@@ -15,7 +15,7 @@
     <!-- The plugin contract, compile-only, from the .nupkg in ./packages-local
          (downloaded from the OpenAC release of the same version). The host
          supplies the contract assembly at runtime. -->
-    <PluginApiPackageVersion>0.1.19</PluginApiPackageVersion>
+    <PluginApiPackageVersion>0.1.21</PluginApiPackageVersion>
     <RestorePackagesWithLockFile>false</RestorePackagesWithLockFile>
   </PropertyGroup>
 </Project>
diff --git a/README.md b/README.md
index 70d0c4a..81c4e1f 100644
--- a/README.md
+++ b/README.md
@@ -56,3 +56,9 @@ dotnet run --project tools/FrameRecorder -- record 18765 frames.jsonl
 /mm ws url ws://localhost:18765/websocket/
 dotnet run --project tools/FrameRecorder -- compare decal.jsonl port.jsonl
 ```
+
+## Local peer subscriptions
+
+Requires OpenAC 0.1.21. Combat vital sharing acquires a local state/cast subscription only while enabled, and releases it on disable, logout or unload. Dashboard vitals still stream every five seconds directly from character state without enabling local peer communication. Existing remote WebSocket frames and timing are unchanged.
+
+Before the new contract release exists, pack AcDream.Plugin.Abstractions 0.1.21 from the matching OpenAC checkout and copy its nupkg into packages-local before restore/build. CI downloads that release, so publish the OpenAC contract before dependent plugin releases.
diff --git a/src/OpenAC.MosswartMassacre/Sharing/VitalSharing.cs b/src/OpenAC.MosswartMassacre/Sharing/VitalSharing.cs
index 6baf92b..de4dd99 100644
--- a/src/OpenAC.MosswartMassacre/Sharing/VitalSharing.cs
+++ b/src/OpenAC.MosswartMassacre/Sharing/VitalSharing.cs
@@ -56,6 +56,7 @@ internal sealed class VitalSharing : IMmFeature, IBackendConnectionListener, ISh
     private readonly MmContext _context;
     private readonly PeerTable _peers = new();
     private IDisposable? _timer;
+    private IDisposable? _peerSubscription;
 
     private int _lastHealth = -1, _lastMaxHealth = -1;
     private int _lastStamina = -1, _lastMaxStamina = -1;
@@ -103,6 +104,8 @@ internal sealed class VitalSharing : IMmFeature, IBackendConnectionListener, ISh
         if (IsActive)
             return;
         IsActive = true;
+        _peerSubscription = _context.Automation.Network.Subscribe(
+            PluginPeerCapabilities.ClientState | PluginPeerCapabilities.Casts);
         ResetOutgoingState();
         _timer = _context.Scheduler.Every(TickInterval, OnTick);
         _context.Send(new
@@ -121,6 +124,8 @@ internal sealed class VitalSharing : IMmFeature, IBackendConnectionListener, ISh
         if (!IsActive)
             return;
         IsActive = false;
+        _peerSubscription?.Dispose();
+        _peerSubscription = null;
         _timer?.Dispose();
         _timer = null;
         _context.Send(new
diff --git a/src/OpenAC.MosswartMassacre/plugin.json b/src/OpenAC.MosswartMassacre/plugin.json
index 47694d1..4cbbf4d 100644
--- a/src/OpenAC.MosswartMassacre/plugin.json
+++ b/src/OpenAC.MosswartMassacre/plugin.json
@@ -6,7 +6,7 @@
   "apiVersion": 1,
   "kinds": ["Gameplay"],
   "hosts": ["Graphical", "Headless"],
-  "minHostVersion": "0.1.19",
+  "minHostVersion": "0.1.21",
   "capabilitiesVersion": 1,
   "capabilities": [
     { "name": "network", "note": "Streams stats, vitals, chat and inventory to Mosswart Overlord, and receives shared vitals and commands from it." },
diff --git a/tests/OpenAC.MosswartMassacre.Tests/Fakes/FakeNetwork.cs b/tests/OpenAC.MosswartMassacre.Tests/Fakes/FakeNetwork.cs
index e3a7c88..132537f 100644
--- a/tests/OpenAC.MosswartMassacre.Tests/Fakes/FakeNetwork.cs
+++ b/tests/OpenAC.MosswartMassacre.Tests/Fakes/FakeNetwork.cs
@@ -8,6 +8,16 @@ namespace OpenAC.MosswartMassacre.Tests.Fakes;
 /// </summary>
 public sealed class FakeNetwork : INetworkAutomation
 {
+    public bool SupportsSubscriptions => true;
+    public List<PluginPeerCapabilities> Requests { get; } = [];
+    public int ActiveLeases { get; private set; }
+    public IDisposable Subscribe(PluginPeerCapabilities capabilities)
+    { Requests.Add(capabilities); ActiveLeases++; return new Lease(this); }
+    private sealed class Lease(FakeNetwork owner) : IDisposable
+    {
+        private bool _disposed;
+        public void Dispose() { if (_disposed) return; _disposed = true; owner.ActiveLeases--; }
+    }
     public bool IsAvailable { get; set; } = true;
 
     public List<PluginNetworkClient> ImportedClients { get; } = [];
diff --git a/tests/OpenAC.MosswartMassacre.Tests/Sharing/VitalSharingTests.cs b/tests/OpenAC.MosswartMassacre.Tests/Sharing/VitalSharingTests.cs
index 10ac642..61f31a0 100644
--- a/tests/OpenAC.MosswartMassacre.Tests/Sharing/VitalSharingTests.cs
+++ b/tests/OpenAC.MosswartMassacre.Tests/Sharing/VitalSharingTests.cs
@@ -42,6 +42,21 @@ public sealed class VitalSharingTests
 
     private static VitalSharing Feature(PluginHarness harness) => harness.Feature<VitalSharing>();
 
+    [Fact]
+    public void Local_peer_subscription_exists_only_while_combat_sharing_is_enabled()
+    {
+        using var harness = Sharing();
+        var network = harness.Host.Automation.Network;
+        Assert.Empty(network.Requests);
+        Feature(harness).Start();
+        Feature(harness).Start();
+        Assert.Equal(1, network.ActiveLeases);
+        Assert.Equal(PluginPeerCapabilities.ClientState | PluginPeerCapabilities.Casts, Assert.Single(network.Requests));
+        Feature(harness).OnLogoff();
+        Feature(harness).Dispose();
+        Assert.Equal(0, network.ActiveLeases);
+    }
+
     [Fact]
     public void Subscribe_on_start_carries_the_player_id_and_tags()
     {