diff --git a/bramble-api/src/main/java/org/briarproject/bramble/api/versioning/event/ClientVersionUpdatedEvent.java b/bramble-api/src/main/java/org/briarproject/bramble/api/versioning/event/ClientVersionUpdatedEvent.java
new file mode 100644
index 000000000..0e9985c77
--- /dev/null
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/versioning/event/ClientVersionUpdatedEvent.java
@@ -0,0 +1,34 @@
+package org.briarproject.bramble.api.versioning.event;
+
+import org.briarproject.bramble.api.contact.ContactId;
+import org.briarproject.bramble.api.event.Event;
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.bramble.api.versioning.ClientVersion;
+
+import javax.annotation.concurrent.Immutable;
+
+/**
+ * An event that is broadcast when we receive a client versioning update from
+ * a contact.
+ */
+@Immutable
+@NotNullByDefault
+public class ClientVersionUpdatedEvent extends Event {
+
+	private final ContactId contactId;
+	private final ClientVersion clientVersion;
+
+	public ClientVersionUpdatedEvent(ContactId contactId,
+			ClientVersion clientVersion) {
+		this.contactId = contactId;
+		this.clientVersion = clientVersion;
+	}
+
+	public ContactId getContactId() {
+		return contactId;
+	}
+
+	public ClientVersion getClientVersion() {
+		return clientVersion;
+	}
+}
diff --git a/bramble-core/src/main/java/org/briarproject/bramble/versioning/ClientVersioningManagerImpl.java b/bramble-core/src/main/java/org/briarproject/bramble/versioning/ClientVersioningManagerImpl.java
index ce4e323c4..b334f3bea 100644
--- a/bramble-core/src/main/java/org/briarproject/bramble/versioning/ClientVersioningManagerImpl.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/versioning/ClientVersioningManagerImpl.java
@@ -28,6 +28,7 @@ import org.briarproject.bramble.api.system.Clock;
 import org.briarproject.bramble.api.versioning.ClientMajorVersion;
 import org.briarproject.bramble.api.versioning.ClientVersion;
 import org.briarproject.bramble.api.versioning.ClientVersioningManager;
+import org.briarproject.bramble.api.versioning.event.ClientVersionUpdatedEvent;
 
 import java.util.ArrayList;
 import java.util.Collection;
@@ -228,9 +229,21 @@ class ClientVersioningManagerImpl implements ClientVersioningManager,
 			Map<ClientMajorVersion, Visibility> after =
 					getVisibilities(newLocalStates, newRemoteStates);
 			// Call hooks for any visibilities that have changed
+			ContactId c = getContactId(txn, m.getGroupId());
 			if (!before.equals(after)) {
-				Contact c = getContact(txn, m.getGroupId());
-				callVisibilityHooks(txn, c, before, after);
+				Contact contact = db.getContact(txn, c);
+				callVisibilityHooks(txn, contact, before, after);
+			}
+			// Broadcast events for any new client versions
+			Set<ClientVersion> oldRemoteVersions = new HashSet<>();
+			for (ClientState cs : oldRemoteStates) {
+				oldRemoteVersions.add(cs.clientVersion);
+			}
+			for (ClientState cs : newRemoteStates) {
+				if (!oldRemoteVersions.contains(cs.clientVersion)) {
+					txn.attach(new ClientVersionUpdatedEvent(c,
+							cs.clientVersion));
+				}
 			}
 		} catch (FormatException e) {
 			throw new InvalidMessageException(e);
@@ -508,12 +521,12 @@ class ClientVersioningManagerImpl implements ClientVersioningManager,
 		storeUpdate(txn, g, states, 1);
 	}
 
-	private Contact getContact(Transaction txn, GroupId g) throws DbException {
+	private ContactId getContactId(Transaction txn, GroupId g)
+			throws DbException {
 		try {
 			BdfDictionary meta =
 					clientHelper.getGroupMetadataAsDictionary(txn, g);
-			int id = meta.getLong(GROUP_KEY_CONTACT_ID).intValue();
-			return db.getContact(txn, new ContactId(id));
+			return new ContactId(meta.getLong(GROUP_KEY_CONTACT_ID).intValue());
 		} catch (FormatException e) {
 			throw new DbException(e);
 		}