diff --git a/iwf-idl b/iwf-idl
index d1da138..343c403 160000
--- a/iwf-idl
+++ b/iwf-idl
@@ -1 +1 @@
-Subproject commit d1da1384bca0c9317b916df3d6bbd3b848dc5150
+Subproject commit 343c403214e66fb9878a1ea873d954731129b0d6
diff --git a/src/main/java/io/iworkflow/core/Client.java b/src/main/java/io/iworkflow/core/Client.java
index 423ff07..9d497da 100644
--- a/src/main/java/io/iworkflow/core/Client.java
+++ b/src/main/java/io/iworkflow/core/Client.java
@@ -138,6 +138,7 @@ public String startWorkflow(
             unregisterWorkflowOptions.workflowConfigOverride(options.getWorkflowConfigOverride());
             unregisterWorkflowOptions.waitForCompletionStateExecutionIds(options.getWaitForCompletionStateExecutionIds());
             unregisterWorkflowOptions.waitForCompletionStateIds(options.getWaitForCompletionStateIds());
+            unregisterWorkflowOptions.workflowAlreadyStartedOptions(options.getWorkflowAlreadyStartedOptions());
 
             final Map<String, SearchAttributeValueType> saTypes = registry.getSearchAttributeKeyToTypeMap(wfType);
             final List<SearchAttribute> convertedSAs = convertToSearchAttributeList(saTypes, options.getInitialSearchAttribute());
diff --git a/src/main/java/io/iworkflow/core/UnregisteredClient.java b/src/main/java/io/iworkflow/core/UnregisteredClient.java
index 6eaf118..27483a2 100644
--- a/src/main/java/io/iworkflow/core/UnregisteredClient.java
+++ b/src/main/java/io/iworkflow/core/UnregisteredClient.java
@@ -12,6 +12,7 @@
 import io.iworkflow.gen.models.PersistenceLoadingPolicy;
 import io.iworkflow.gen.models.SearchAttributeKeyAndType;
 import io.iworkflow.gen.models.StateCompletionOutput;
+import io.iworkflow.gen.models.WorkflowAlreadyStartedOptions;
 import io.iworkflow.gen.models.WorkflowGetDataObjectsRequest;
 import io.iworkflow.gen.models.WorkflowGetDataObjectsResponse;
 import io.iworkflow.gen.models.WorkflowGetRequest;
@@ -170,6 +171,10 @@ public String startWorkflow(
                 startOptions.useMemoForDataAttributes(options.getUsingMemoForDataAttributes().get());
             }
 
+            if (options.getWorkflowAlreadyStartedOptions().isPresent()) {
+                startOptions.workflowAlreadyStartedOptions(options.getWorkflowAlreadyStartedOptions().get());
+            }
+
             request.workflowStartOptions(startOptions);
 
             request.waitForCompletionStateExecutionIds(options.getWaitForCompletionStateExecutionIds());
diff --git a/src/main/java/io/iworkflow/core/UnregisteredWorkflowOptions.java b/src/main/java/io/iworkflow/core/UnregisteredWorkflowOptions.java
index 11419a2..f9f85ed 100644
--- a/src/main/java/io/iworkflow/core/UnregisteredWorkflowOptions.java
+++ b/src/main/java/io/iworkflow/core/UnregisteredWorkflowOptions.java
@@ -2,6 +2,7 @@
 
 import io.iworkflow.gen.models.IDReusePolicy;
 import io.iworkflow.gen.models.SearchAttribute;
+import io.iworkflow.gen.models.WorkflowAlreadyStartedOptions;
 import io.iworkflow.gen.models.WorkflowConfig;
 import io.iworkflow.gen.models.WorkflowRetryPolicy;
 import io.iworkflow.gen.models.WorkflowStateOptions;
@@ -31,4 +32,6 @@ public abstract class UnregisteredWorkflowOptions {
     public abstract List<String> getWaitForCompletionStateExecutionIds();
 
     public abstract List<String> getWaitForCompletionStateIds();
+
+    public abstract Optional<WorkflowAlreadyStartedOptions> getWorkflowAlreadyStartedOptions();
 }
diff --git a/src/main/java/io/iworkflow/core/WorkflowOptions.java b/src/main/java/io/iworkflow/core/WorkflowOptions.java
index e97773d..3cd7d73 100644
--- a/src/main/java/io/iworkflow/core/WorkflowOptions.java
+++ b/src/main/java/io/iworkflow/core/WorkflowOptions.java
@@ -1,6 +1,7 @@
 package io.iworkflow.core;
 
 import io.iworkflow.gen.models.IDReusePolicy;
+import io.iworkflow.gen.models.WorkflowAlreadyStartedOptions;
 import io.iworkflow.gen.models.WorkflowConfig;
 import io.iworkflow.gen.models.WorkflowRetryPolicy;
 import org.immutables.value.Value;
@@ -26,6 +27,8 @@ public abstract class WorkflowOptions {
     public abstract List<String> getWaitForCompletionStateIds();
     public abstract List<String> getWaitForCompletionStateExecutionIds();
 
+    public abstract Optional<WorkflowAlreadyStartedOptions> getWorkflowAlreadyStartedOptions();
+
     public static WorkflowOptionBuilderExtension extendedBuilder() {
         return new WorkflowOptionBuilderExtension();
     }