diff --git a/config/clients/java/template/OpenFgaApiTest.java.mustache b/config/clients/java/template/OpenFgaApiTest.java.mustache
index 55c31a47..d0ad5f9f 100644
--- a/config/clients/java/template/OpenFgaApiTest.java.mustache
+++ b/config/clients/java/template/OpenFgaApiTest.java.mustache
@@ -18,6 +18,7 @@ import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.concurrent.ExecutionException;
+import java.time.OffsetDateTime; 
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 
@@ -794,9 +795,10 @@ public class OpenFgaApiTest {
         String type = null; // Input is optional
         Integer pageSize = null; // Input is optional
         String continuationToken = null; // Input is optional
+        OffsetDateTime startTime = null; //Input is optional
 
         // When
-        var response = fga.readChanges(DEFAULT_STORE_ID, type, pageSize, continuationToken)
+        var response = fga.readChanges(DEFAULT_STORE_ID, type, pageSize, continuationToken, startTime)
                 .get();
 
         // Then
@@ -814,7 +816,7 @@ public class OpenFgaApiTest {
     @Test
     public void readChanges_storeIdRequired() throws Exception {
         // When
-        var exception = assertThrows(FgaInvalidParameterException.class, () -> fga.readChanges(null, null, null, null)
+        var exception = assertThrows(FgaInvalidParameterException.class, () -> fga.readChanges(null, null, null, null, null)
                 .get());
 
         // Then
@@ -831,10 +833,11 @@ public class OpenFgaApiTest {
         String type = null; // Input is optional
         Integer pageSize = null; // Input is optional
         String continuationToken = null; // Input is optional
+        OffsetDateTime startTime = null; // Input is optional
 
         // When
         ExecutionException execException = assertThrows(
-                ExecutionException.class, () -> fga.readChanges(DEFAULT_STORE_ID, type, pageSize, continuationToken)
+                ExecutionException.class, () -> fga.readChanges(DEFAULT_STORE_ID, type, pageSize, continuationToken, startTime)
                         .get());
 
         // Then
@@ -856,10 +859,11 @@ public class OpenFgaApiTest {
         String type = null; // Input is optional
         Integer pageSize = null; // Input is optional
         String continuationToken = null; // Input is optional
+        OffsetDateTime startTime = null; // Input is optional
 
         // When
         ExecutionException execException = assertThrows(
-                ExecutionException.class, () -> fga.readChanges(DEFAULT_STORE_ID, type, pageSize, continuationToken)
+                ExecutionException.class, () -> fga.readChanges(DEFAULT_STORE_ID, type, pageSize, continuationToken, startTime)
                         .get());
 
         // Then
@@ -880,10 +884,11 @@ public class OpenFgaApiTest {
         String type = null; // Input is optional
         Integer pageSize = null; // Input is optional
         String continuationToken = null; // Input is optional
+        OffsetDateTime startTime = null; // Input is optional
 
         // When
         ExecutionException execException = assertThrows(
-                ExecutionException.class, () -> fga.readChanges(DEFAULT_STORE_ID, type, pageSize, continuationToken)
+                ExecutionException.class, () -> fga.readChanges(DEFAULT_STORE_ID, type, pageSize, continuationToken, startTime)
                         .get());
 
         // Then
diff --git a/config/clients/java/template/client-ClientReadChangesRequest.java.mustache b/config/clients/java/template/client-ClientReadChangesRequest.java.mustache
index 030a07c4..be00cedb 100644
--- a/config/clients/java/template/client-ClientReadChangesRequest.java.mustache
+++ b/config/clients/java/template/client-ClientReadChangesRequest.java.mustache
@@ -1,12 +1,18 @@
 {{>licenseInfo}}
 package {{clientPackage}}.model;
 
+import java.time.OffsetDateTime; 
+
 public class ClientReadChangesRequest {
     private String type;
-    private String startTime;
+    private OffsetDateTime startTime;
 
     public ClientReadChangesRequest type(String type) {
         this.type = type;
+        return this;
+    }
+
+    public ClientReadChangesRequest startTime(OffsetDateTime startTime) {
         this.startTime = startTime;
         return this;
     }
@@ -15,7 +21,7 @@ public class ClientReadChangesRequest {
         return type;
     }
 
-    public String getStartTime(){
+    public OffsetDateTime getStartTime(){
         return startTime;
     }
 }
diff --git a/config/clients/java/template/client-OpenFgaClient.java.mustache b/config/clients/java/template/client-OpenFgaClient.java.mustache
index 164b9e53..c4001c95 100644
--- a/config/clients/java/template/client-OpenFgaClient.java.mustache
+++ b/config/clients/java/template/client-OpenFgaClient.java.mustache
@@ -283,7 +283,7 @@ public class OpenFgaClient {
         var options = readChangesOptions != null ? readChangesOptions : new ClientReadChangesOptions();
         var overrides = new ConfigurationOverride().addHeaders(options);
         return call(() -> api.readChanges(
-                        storeId, request.getType(), options.getPageSize(), options.getContinuationToken(), overrides))
+                        storeId, request.getType(), options.getPageSize(), options.getContinuationToken(), request.getStartTime(), overrides))
                 .thenApply(ClientReadChangesResponse::new);
     }