diff --git a/Bucketeer/Sources/Internal/Remote/ApiClientImpl.swift b/Bucketeer/Sources/Internal/Remote/ApiClientImpl.swift
index 88f4e786..3cdd36e8 100644
--- a/Bucketeer/Sources/Internal/Remote/ApiClientImpl.swift
+++ b/Bucketeer/Sources/Internal/Remote/ApiClientImpl.swift
@@ -50,7 +50,8 @@ final class ApiClientImpl: ApiClient {
             userEvaluationsId: userEvaluationsId,
             sourceId: .ios,
             userEvaluationCondition: UserEvaluationCondition(evaluatedAt: condition.evaluatedAt,
-                                                             userAttributesUpdated: condition.userAttributesUpdated)
+                                                             userAttributesUpdated: condition.userAttributesUpdated),
+            sdkVersion: Version.current
         )
         let featureTag = self.featureTag
         let timeoutMillisValue = timeoutMillis ?? defaultRequestTimeoutMills
@@ -78,7 +79,8 @@ final class ApiClientImpl: ApiClient {
 
     func registerEvents(events: [Event], completion: ((Result<RegisterEventsResponse, BKTError>) -> Void)?) {
         let requestBody = RegisterEventsRequestBody(
-            events: events
+            events: events,
+            sdkVersion: Version.current
         )
         logger?.debug(message: "[API] Register events: \(requestBody)")
         let encoder = JSONEncoder()
diff --git a/Bucketeer/Sources/Internal/Remote/RequestBody/GetEvaluationsRequestBody.swift b/Bucketeer/Sources/Internal/Remote/RequestBody/GetEvaluationsRequestBody.swift
index abc818e4..610466fe 100644
--- a/Bucketeer/Sources/Internal/Remote/RequestBody/GetEvaluationsRequestBody.swift
+++ b/Bucketeer/Sources/Internal/Remote/RequestBody/GetEvaluationsRequestBody.swift
@@ -6,4 +6,7 @@ struct GetEvaluationsRequestBody: Codable {
     let userEvaluationsId: String
     let sourceId: SourceID
     let userEvaluationCondition: UserEvaluationCondition
+    // noted: we didn't set the default value to prevent the warning about Decodeable will not work
+    // error message "Immutable property will not be decoded because it is declared with an initial value which cannot be overwritten"
+    let sdkVersion: String
 }
diff --git a/Bucketeer/Sources/Internal/Remote/RequestBody/RegisterEventsRequestBody.swift b/Bucketeer/Sources/Internal/Remote/RequestBody/RegisterEventsRequestBody.swift
index 9cf0268d..1fffc5fa 100644
--- a/Bucketeer/Sources/Internal/Remote/RequestBody/RegisterEventsRequestBody.swift
+++ b/Bucketeer/Sources/Internal/Remote/RequestBody/RegisterEventsRequestBody.swift
@@ -2,4 +2,5 @@ import Foundation
 
 struct RegisterEventsRequestBody: Codable {
     let events: [Event]
+    let sdkVersion: String
 }
diff --git a/BucketeerTests/ApiClientTests.swift b/BucketeerTests/ApiClientTests.swift
index 87edfe60..fc42b7e3 100644
--- a/BucketeerTests/ApiClientTests.swift
+++ b/BucketeerTests/ApiClientTests.swift
@@ -37,6 +37,7 @@ class ApiClientTests: XCTestCase {
                 let jsonString = String(data: data, encoding: .utf8) ?? ""
                 let expected = """
 {
+  "sdkVersion" : "\(Version.current)",
   "sourceId" : 2,
   "tag" : "tag1",
   "user" : {
@@ -114,6 +115,7 @@ class ApiClientTests: XCTestCase {
                 let jsonString = String(data: data, encoding: .utf8) ?? ""
                 let expected = """
 {
+  "sdkVersion" : "\(Version.current)",
   "sourceId" : 2,
   "tag" : "tag1",
   "user" : {
@@ -247,7 +249,8 @@ class ApiClientTests: XCTestCase {
       "id" : "evaluation_event1",
       "type" : 3
     }
-  ]
+  ],
+  "sdkVersion" : "\(Version.current)"
 }
 """
                 XCTAssertEqual(jsonString, expected)
@@ -356,7 +359,8 @@ class ApiClientTests: XCTestCase {
       "id" : "evaluation_event1",
       "type" : 3
     }
-  ]
+  ],
+  "sdkVersion" : "\(Version.current)"
 }
 """
                 XCTAssertEqual(jsonString, expected)