diff --git a/common/build.gradle.kts b/common/build.gradle.kts
index 4ee5ea7..6f91d6e 100644
--- a/common/build.gradle.kts
+++ b/common/build.gradle.kts
@@ -11,7 +11,7 @@ repositories {
 }
 
 dependencies {
-    protobuf("gg.grounds:library-grpc-contracts-player:0.6.0")
+    protobuf("gg.grounds:library-grpc-contracts-player:0.7.0")
 
     testImplementation("org.junit.jupiter:junit-jupiter-api:5.13.4")
     testRuntimeOnly("org.junit.jupiter:junit-jupiter-engine:5.13.4")
diff --git a/common/src/main/kotlin/gg/grounds/player/presence/GrpcPlayerPresenceClient.kt b/common/src/main/kotlin/gg/grounds/player/presence/GrpcPlayerPresenceClient.kt
index 423a996..7121a25 100644
--- a/common/src/main/kotlin/gg/grounds/player/presence/GrpcPlayerPresenceClient.kt
+++ b/common/src/main/kotlin/gg/grounds/player/presence/GrpcPlayerPresenceClient.kt
@@ -58,12 +58,20 @@ private constructor(
         }
     }
 
-    fun logout(playerId: UUID): PlayerLogoutReply {
+    /**
+     * [proxyId] scopes the delete to this proxy's own session: a logout that raced a proxy-to-proxy
+     * transfer must not remove the session the next proxy just created. Empty is legal (the service
+     * falls back to the old unconditional delete).
+     */
+    fun logout(playerId: UUID, proxyId: String = ""): PlayerLogoutReply {
         return try {
             stub
                 .withDeadlineAfter(DEFAULT_TIMEOUT_MS, TimeUnit.MILLISECONDS)
                 .playerLogout(
-                    PlayerLogoutRequest.newBuilder().setPlayerId(playerId.toString()).build()
+                    PlayerLogoutRequest.newBuilder()
+                        .setPlayerId(playerId.toString())
+                        .setProxyId(proxyId)
+                        .build()
                 )
         } catch (e: StatusRuntimeException) {
             errorLogoutReply(e.status.toString())
diff --git a/velocity/src/main/kotlin/gg/grounds/listener/PlayerConnectionListener.kt b/velocity/src/main/kotlin/gg/grounds/listener/PlayerConnectionListener.kt
index dc42694..b01c63e 100644
--- a/velocity/src/main/kotlin/gg/grounds/listener/PlayerConnectionListener.kt
+++ b/velocity/src/main/kotlin/gg/grounds/listener/PlayerConnectionListener.kt
@@ -89,7 +89,7 @@ class PlayerConnectionListener(
         val name = event.player.username
 
         return EventTask.async {
-            val result = playerPresenceService.logout(playerId) ?: return@async
+            val result = playerPresenceService.logout(playerId, proxyId()) ?: return@async
             if (result.removed) {
                 logger.info(
                     "Player session logout completed (playerId={}, username={}, message={})",
@@ -181,7 +181,7 @@ class PlayerConnectionListener(
         val online = proxy.getPlayer(playerId).isPresent
         if (!shouldReleaseAbandonedLogin(pendingLogins, playerId, online)) return
 
-        val result = playerPresenceService.logout(playerId)
+        val result = playerPresenceService.logout(playerId, proxyId())
         logger.info(
             "Player session released after abandoned login (playerId={}, username={}, removed={})",
             playerId,
diff --git a/velocity/src/main/kotlin/gg/grounds/presence/PlayerPresenceService.kt b/velocity/src/main/kotlin/gg/grounds/presence/PlayerPresenceService.kt
index 70e7e2d..550ca17 100644
--- a/velocity/src/main/kotlin/gg/grounds/presence/PlayerPresenceService.kt
+++ b/velocity/src/main/kotlin/gg/grounds/presence/PlayerPresenceService.kt
@@ -88,9 +88,9 @@ class PlayerPresenceService : AutoCloseable {
         }
     }
 
-    fun logout(playerId: UUID): PlayerLogoutReply? {
+    fun logout(playerId: UUID, proxyId: String = ""): PlayerLogoutReply? {
         return try {
-            client.logout(playerId)
+            client.logout(playerId, proxyId)
         } catch (e: RuntimeException) {
             null
         }