diff --git a/CHANGELOG.md b/CHANGELOG.md
index f2690f8..1ec7420 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## Unreleased
+
+- New `updatePostbackConversionValue(value, { coarseValue, lockPostback, conversionTypes })` (iOS):
+  AdAttributionKit postback updates, with locking and per-conversion-type updates on iOS 18+.
+  Resolves `false` on Android. `registerForSKAdAttribution()` / `updateConversionValue()` now reach
+  AdAttributionKit too.
+- Requires the iOS native SDK **`LinkTrailSDK ~> 0.0.13`** (the first release with AdAttributionKit).
+
 ## 0.0.4
 
 - Bump the iOS native SDK to **`LinkTrailSDK ~> 0.0.11`** (from `0.0.10`).
diff --git a/LinktrailReactNative.podspec b/LinktrailReactNative.podspec
index 37ddda6..2f8c0a3 100644
--- a/LinktrailReactNative.podspec
+++ b/LinktrailReactNative.podspec
@@ -18,7 +18,7 @@ Pod::Spec.new do |s|
 
   # The binary LinkTrail iOS SDK, published to the CocoaPods trunk — CocoaPods
   # resolves it automatically, so the consuming app needs no extra Podfile line.
-  s.dependency "LinkTrailSDK", "~> 0.0.11"
+  s.dependency "LinkTrailSDK", "~> 0.0.13"
 
   s.pod_target_xcconfig = {
     "DEFINES_MODULE" => "YES",
diff --git a/README.md b/README.md
index 25b178f..87181c3 100644
--- a/README.md
+++ b/README.md
@@ -57,6 +57,13 @@ const lastLink = await LinkTrail.getLastDeepLink();
 await LinkTrail.requestTrackingAuthorization();
 LinkTrail.registerForSKAdAttribution();
 LinkTrail.updateConversionValue(42, 'medium');
+// iOS 17.4+ AdAttributionKit (SKAdNetwork before); conversionTypes applies on iOS 18+.
+// Resolves false on Android.
+await LinkTrail.updatePostbackConversionValue(12, {
+  coarseValue: 'high',
+  lockPostback: false,
+  conversionTypes: ['install'],
+});
 ```
 
 `configure` also takes `{ logEnabled, logLevel, requestTimeoutMillis, retryPolicy, linkDomains,
diff --git a/android/src/main/java/io/linktrail/reactnative/LinkTrailModule.kt b/android/src/main/java/io/linktrail/reactnative/LinkTrailModule.kt
index 6f9673b..dce0913 100644
--- a/android/src/main/java/io/linktrail/reactnative/LinkTrailModule.kt
+++ b/android/src/main/java/io/linktrail/reactnative/LinkTrailModule.kt
@@ -4,6 +4,7 @@ import android.net.Uri
 import com.facebook.react.bridge.Arguments
 import com.facebook.react.bridge.Promise
 import com.facebook.react.bridge.ReactApplicationContext
+import com.facebook.react.bridge.ReadableArray
 import com.facebook.react.bridge.ReadableMap
 import com.facebook.react.bridge.ReadableType
 import com.facebook.react.bridge.WritableMap
@@ -135,6 +136,17 @@ class LinkTrailModule(reactContext: ReactApplicationContext) :
 
   override fun updateConversionValue(value: Double, coarseValue: String?) = Unit
 
+  override fun updatePostbackConversionValue(
+    value: Double,
+    coarseValue: String?,
+    lockPostback: Boolean,
+    conversionTypes: ReadableArray,
+    promise: Promise
+  ) {
+    // AdAttributionKit is Apple-only.
+    promise.resolve(false)
+  }
+
   // ── Consent ──────────────────────────────────────────────────────────────
 
   override fun setConsent(granted: Boolean) {
diff --git a/ios/LinkTrailModule.mm b/ios/LinkTrailModule.mm
index c46bce2..48976a3 100644
--- a/ios/LinkTrailModule.mm
+++ b/ios/LinkTrailModule.mm
@@ -126,6 +126,21 @@ - (void)updateConversionValue:(double)value coarseValue:(NSString *)coarseValue
   [_impl updateConversionValue:(NSInteger)llround(value) coarseValue:coarseValue];
 }
 
+- (void)updatePostbackConversionValue:(double)value
+                         coarseValue:(NSString *)coarseValue
+                        lockPostback:(BOOL)lockPostback
+                     conversionTypes:(NSArray *)conversionTypes
+                             resolve:(RCTPromiseResolveBlock)resolve
+                              reject:(RCTPromiseRejectBlock)reject
+{
+  [_impl updatePostbackConversionValue:(NSInteger)llround(value)
+                           coarseValue:coarseValue
+                          lockPostback:lockPostback
+                       conversionTypes:conversionTypes
+                               resolve:resolve
+                                reject:^(NSString *code, NSString *message) { reject(code, message, nil); }];
+}
+
 - (void)setConsent:(BOOL)granted
 {
   [_impl setConsent:granted];
diff --git a/ios/LinkTrailModuleImpl.swift b/ios/LinkTrailModuleImpl.swift
index a9befed..b42ce9b 100644
--- a/ios/LinkTrailModuleImpl.swift
+++ b/ios/LinkTrailModuleImpl.swift
@@ -153,6 +153,26 @@ public final class LinkTrailModuleImpl: NSObject {
     sdk?.updateConversionValue(value, coarseValue: coarse)
   }
 
+  @objc public func updatePostbackConversionValue(
+    _ value: Int,
+    coarseValue: String?,
+    lockPostback: Bool,
+    conversionTypes: [String],
+    resolve: @escaping Resolve,
+    reject: @escaping Reject
+  ) {
+    guard let sdk = requireSDK(reject) else { return }
+    let coarse = coarseValue.flatMap(LinkTrailCoarseConversionValue.init(rawValue:))
+    // An empty list means "all types"; unknown strings are dropped rather than failing the call.
+    let types = Set(conversionTypes.compactMap(LinkTrailConversionType.init(rawValue:)))
+    Task {
+      resolve(
+        await sdk.updatePostbackConversionValue(
+          value, coarseValue: coarse, lockPostback: lockPostback,
+          conversionTypes: types.isEmpty ? nil : types))
+    }
+  }
+
   // MARK: - Consent
 
   @objc public func setConsent(_ granted: Bool) {
diff --git a/src/NativeLinkTrail.ts b/src/NativeLinkTrail.ts
index 8c72ed1..0ba7038 100644
--- a/src/NativeLinkTrail.ts
+++ b/src/NativeLinkTrail.ts
@@ -53,6 +53,18 @@ export interface Spec extends TurboModule {
   /** iOS: updates the SKAdNetwork conversion value. Android: no-op. */
   updateConversionValue(value: number, coarseValue?: string): void;
 
+  /**
+   * iOS: updates pending AdAttributionKit / SKAdNetwork postbacks. `conversionTypes`
+   * is a list of 'install' / 'reengagement' (empty = all). Resolves whether every
+   * framework call succeeded. Android: resolves `false`.
+   */
+  updatePostbackConversionValue(
+    value: number,
+    coarseValue: string | undefined,
+    lockPostback: boolean,
+    conversionTypes: Array<string>
+  ): Promise<boolean>;
+
   /** Grants/revokes tracking consent (only meaningful with `requireConsent`). */
   setConsent(granted: boolean): void;
 
diff --git a/src/index.ts b/src/index.ts
index a396586..1aaafd8 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -3,6 +3,7 @@ import NativeLinkTrail from './NativeLinkTrail';
 import type {
   LinkTrailAttribution,
   LinkTrailCoarseConversionValue,
+  LinkTrailPostbackUpdateOptions,
   LinkTrailDeepLink,
   LinkTrailErrorEvent,
   LinkTrailEventResult,
@@ -190,6 +191,25 @@ export const LinkTrail = {
     NativeLinkTrail.updateConversionValue(value, coarseValue);
   },
 
+  /**
+   * iOS: updates the conversion value of pending AdAttributionKit (iOS 17.4+) and
+   * SKAdNetwork postbacks, with postback locking and, on iOS 18+, per-conversion-type
+   * updates. Resolves `true` when every framework call succeeded (also when the
+   * user never saw an ad, since there is nothing to update). Android: resolves
+   * `false` — there is no equivalent.
+   */
+  updatePostbackConversionValue(
+    value: number,
+    options: LinkTrailPostbackUpdateOptions = {}
+  ): Promise<boolean> {
+    return NativeLinkTrail.updatePostbackConversionValue(
+      value,
+      options.coarseValue,
+      options.lockPostback ?? false,
+      options.conversionTypes ?? []
+    );
+  },
+
   /**
    * Grants or revokes the user's tracking consent. Only meaningful when
    * `configure` was called with `requireConsent: true` (the default).
diff --git a/src/types.ts b/src/types.ts
index a290324..5e2c050 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -122,6 +122,22 @@ export type LinkTrailClickTokenSource = 'pasteButton' | 'automatic' | 'none';
 /** SKAdNetwork 4.0+ coarse conversion value bucket (iOS only). */
 export type LinkTrailCoarseConversionValue = 'low' | 'medium' | 'high';
 
+/**
+ * Which conversions an AdAttributionKit postback update applies to (iOS 18+;
+ * earlier versions update every type).
+ */
+export type LinkTrailConversionType = 'install' | 'reengagement';
+
+/** Options for `updatePostbackConversionValue` (iOS only). */
+export interface LinkTrailPostbackUpdateOptions {
+  /** Coarse value for lower crowd-anonymity tiers. Defaults to `'low'`. */
+  coarseValue?: LinkTrailCoarseConversionValue;
+  /** Finalise the postback so no later update applies. Defaults to `false`. */
+  lockPostback?: boolean;
+  /** Restrict the update to these conversion types (iOS 18+). Omit for all. */
+  conversionTypes?: LinkTrailConversionType[];
+}
+
 /** A subscription returned by the event-listener APIs. */
 export interface LinkTrailSubscription {
   remove(): void;