diff --git a/saga-sdk-java/src/main/java/games/mythical/saga/sdk/client/executor/SagaItemExecutor.java b/saga-sdk-java/src/main/java/games/mythical/saga/sdk/client/executor/SagaItemExecutor.java
index d29985e..a5b3e23 100644
--- a/saga-sdk-java/src/main/java/games/mythical/saga/sdk/client/executor/SagaItemExecutor.java
+++ b/saga-sdk-java/src/main/java/games/mythical/saga/sdk/client/executor/SagaItemExecutor.java
@@ -12,7 +12,8 @@ void updateItem(String inventoryId,
                     Long tokenId,
                     String metadataUrl,
                     String traceId,
-                    ItemState itemState) throws Exception;
+                    ItemState itemState,
+                    Long version) throws Exception;
 
     void updateItems(List<SagaItemUpdate> updates, String traceId) throws Exception;
 
diff --git a/saga-sdk-java/src/main/java/games/mythical/saga/sdk/client/model/SagaItem.java b/saga-sdk-java/src/main/java/games/mythical/saga/sdk/client/model/SagaItem.java
index c6dfbc4..35d3b82 100644
--- a/saga-sdk-java/src/main/java/games/mythical/saga/sdk/client/model/SagaItem.java
+++ b/saga-sdk-java/src/main/java/games/mythical/saga/sdk/client/model/SagaItem.java
@@ -28,6 +28,7 @@ public class SagaItem {
     @DtoExclude
     private Instant updatedAt;
     private String state;
+    private long version;
 
     public static SagaItem fromProto(ItemProto proto) {
         var user = ProtoUtil.toDto(proto, SagaItem.class);
diff --git a/saga-sdk-java/src/main/java/games/mythical/saga/sdk/client/model/SagaItemUpdate.java b/saga-sdk-java/src/main/java/games/mythical/saga/sdk/client/model/SagaItemUpdate.java
index 71a50f9..19c28b0 100644
--- a/saga-sdk-java/src/main/java/games/mythical/saga/sdk/client/model/SagaItemUpdate.java
+++ b/saga-sdk-java/src/main/java/games/mythical/saga/sdk/client/model/SagaItemUpdate.java
@@ -19,6 +19,7 @@ public class SagaItemUpdate {
     private String oauthId;
     private long tokenId;
     private String metadataUrl;
+    private long version;
     @DtoExclude
     private ItemState itemState;
 
diff --git a/saga-sdk-java/src/main/java/games/mythical/saga/sdk/client/observer/SagaStatusUpdateObserver.java b/saga-sdk-java/src/main/java/games/mythical/saga/sdk/client/observer/SagaStatusUpdateObserver.java
index 4a0ce54..e1af6ad 100644
--- a/saga-sdk-java/src/main/java/games/mythical/saga/sdk/client/observer/SagaStatusUpdateObserver.java
+++ b/saga-sdk-java/src/main/java/games/mythical/saga/sdk/client/observer/SagaStatusUpdateObserver.java
@@ -229,7 +229,8 @@ private void handleItemUpdate(ItemUpdate update, String traceId) throws Exceptio
                     message.getTokenId(),
                     message.getMetadataUrl(),
                     traceId,
-                    message.getItemState()
+                    message.getItemState(),
+                    message.getVersion()
                 );
             } else {
                 final var updates = update.getStatusUpdates().getStatusUpdatesList().stream()
diff --git a/saga-sdk-java/src/test/java/games/mythical/saga/sdk/client/SagaItemClientTest.java b/saga-sdk-java/src/test/java/games/mythical/saga/sdk/client/SagaItemClientTest.java
index 5e28a33..b98a105 100644
--- a/saga-sdk-java/src/test/java/games/mythical/saga/sdk/client/SagaItemClientTest.java
+++ b/saga-sdk-java/src/test/java/games/mythical/saga/sdk/client/SagaItemClientTest.java
@@ -79,6 +79,7 @@ public void getItem() throws Exception {
                 .setMetadataUrl("metadata-url")
                 .setCreatedAt(Timestamps.fromMillis(Instant.now().toEpochMilli() - 86400))
                 .setUpdatedAt(Timestamps.fromMillis(Instant.now().toEpochMilli()))
+                .setVersion(1L)
                 .build();
         when(mockServiceBlockingStub.getItem(any())).thenReturn(expectedResponse);
         var itemResponse = itemClient.getItem(INVENTORY_ID);
diff --git a/saga-sdk-java/src/test/java/games/mythical/saga/sdk/client/executor/MockItemExecutor.java b/saga-sdk-java/src/test/java/games/mythical/saga/sdk/client/executor/MockItemExecutor.java
index 712f25d..bc47ae1 100644
--- a/saga-sdk-java/src/test/java/games/mythical/saga/sdk/client/executor/MockItemExecutor.java
+++ b/saga-sdk-java/src/test/java/games/mythical/saga/sdk/client/executor/MockItemExecutor.java
@@ -17,6 +17,7 @@ public class MockItemExecutor extends MockBaseExecutor implements SagaItemExecut
     private String metadataUri;
     private String traceId;
     private ItemState itemState;
+    private Long version;
 
     @Override
     public void updateItem(String inventoryId,
@@ -25,7 +26,8 @@ public void updateItem(String inventoryId,
                            Long tokenId,
                            String metadataUrl,
                            String traceId,
-                           ItemState itemState) throws Exception {
+                           ItemState itemState,
+                           Long version) throws Exception {
         this.inventoryId = inventoryId;
         this.itemTypeId = itemTypeId;
         this.oauthId = oauthId;
@@ -33,6 +35,7 @@ public void updateItem(String inventoryId,
         this.metadataUri = metadataUrl;
         this.traceId = traceId;
         this.itemState = itemState;
+        this.version = version;
     }
 
     @Override
@@ -45,7 +48,8 @@ public void updateItems(List<SagaItemUpdate> updates, String traceId) throws Exc
                 update.getTokenId(),
                 update.getMetadataUrl(),
                 traceId,
-                update.getItemState()
+                update.getItemState(),
+                update.getVersion()
         );
     }
 
diff --git a/saga-sdk-proto/src/main/proto b/saga-sdk-proto/src/main/proto
index b02d0e8..aea311b 160000
--- a/saga-sdk-proto/src/main/proto
+++ b/saga-sdk-proto/src/main/proto
@@ -1 +1 @@
-Subproject commit b02d0e8a062d62ed86f85e2c520723814ff6ed3a
+Subproject commit aea311b4a13dd0932fa0b30ad0000efb2b5cfa36