diff --git a/UID2Prebid.podspec.json b/UID2Prebid.podspec.json
index 1cc0d74..b8261e9 100644
--- a/UID2Prebid.podspec.json
+++ b/UID2Prebid.podspec.json
@@ -32,7 +32,7 @@
       "~> 1.3.0"
     ],
     "PrebidMobile": [
-      "~> 2.0"
+      "~> 2.4"
     ]
   }
 }
diff --git a/UID2Prebid/Cartfile.resolved b/UID2Prebid/Cartfile.resolved
index 51e51d5..aec8628 100644
--- a/UID2Prebid/Cartfile.resolved
+++ b/UID2Prebid/Cartfile.resolved
@@ -1 +1 @@
-github "prebid/prebid-mobile-ios" "2.2.3"
+github "prebid/prebid-mobile-ios" "2.4.0"
diff --git a/UID2Prebid/Carthage/Checkouts/prebid-mobile-ios b/UID2Prebid/Carthage/Checkouts/prebid-mobile-ios
index 4020716..f18bf54 160000
--- a/UID2Prebid/Carthage/Checkouts/prebid-mobile-ios
+++ b/UID2Prebid/Carthage/Checkouts/prebid-mobile-ios
@@ -1 +1 @@
-Subproject commit 4020716722b7a73b45abb91c869cd6b0af12f046
+Subproject commit f18bf54bd58abf6f5cfd20ae53ec8eabb3d60b65
diff --git a/UID2Prebid/UID2Prebid/UID2Prebid.swift b/UID2Prebid/UID2Prebid/UID2Prebid.swift
index 7d50e96..85dc4e8 100644
--- a/UID2Prebid/UID2Prebid/UID2Prebid.swift
+++ b/UID2Prebid/UID2Prebid/UID2Prebid.swift
@@ -10,13 +10,17 @@ protocol UserIDUpdater: Sendable {
 struct PrebidUserIDUpdater: UserIDUpdater {
     /// Passes the observed IDs to Prebid
     func updateUserIDs(_ userIDs: [ExternalUserId]) {
-        Prebid.shared.externalUserIdArray = userIDs
+        Targeting.shared.setExternalUserIds(userIDs)
     }
 }
 
 public actor UID2Prebid: Sendable {
     let thirdPartyUserIDs: @Sendable () async -> [ExternalUserId]
     let userIDUpdater: UserIDUpdater
+
+    // https://github.com/InteractiveAdvertisingBureau/AdCOM/blob/main/AdCOM%20v1.0%20FINAL.md#list_agenttypes
+    // "A person-based ID, i.e., that is the same across devices."
+    private let agentType: NSNumber = 3
     private let source = "uidapi.com"
     private var task: Task<Void, Never>?
     
@@ -72,8 +76,10 @@ public actor UID2Prebid: Sendable {
     func updateExternalUserID(_ advertisingToken: String?) async {
         var userIDs = await self.thirdPartyUserIDs()
         if let advertisingToken {
-            let advertisingTokenUser = ExternalUserId(source: source, identifier: advertisingToken)
-            userIDs.append(advertisingTokenUser)
+            userIDs.append(ExternalUserId(
+                source: source,
+                uids: [.init(id: advertisingToken, aType: agentType)]
+            ))
         }
         await userIDUpdater.updateUserIDs(userIDs)
     }
diff --git a/UID2Prebid/UID2PrebidTests/UID2PrebidTests.swift b/UID2Prebid/UID2PrebidTests/UID2PrebidTests.swift
index e20e10b..f4b98dc 100644
--- a/UID2Prebid/UID2PrebidTests/UID2PrebidTests.swift
+++ b/UID2Prebid/UID2PrebidTests/UID2PrebidTests.swift
@@ -51,7 +51,9 @@ final class UID2PrebidTests: XCTestCase {
             }
         )
         await observation(
-            of: [ExternalUserId(source: "uidapi.com", identifier: "cat")],
+            of: [
+                ExternalUserId(source: "uidapi.com", uids: [.init(id: "cat", aType: 1)])
+            ],
             by: updater
         )
 
@@ -65,7 +67,9 @@ final class UID2PrebidTests: XCTestCase {
             .established(.established(advertisingToken: "turtle"))
         )
         await observation(
-            of: [ExternalUserId(source: "uidapi.com", identifier: "turtle")],
+            of: [
+                ExternalUserId(source: "uidapi.com", uids: [.init(id: "turtle", aType: 1)])
+            ],
             by: updater
         )
     }
@@ -89,7 +93,7 @@ final class UID2PrebidTests: XCTestCase {
             manager: manager,
             thirdPartyUserIDs: {
                 [
-                    ExternalUserId(source: "example.com", identifier: "dog")
+                    ExternalUserId(source: "example.com", uids: [.init(id: "dog", aType: 1)])
                 ]
             },
             userIDUpdater: updater,
@@ -102,8 +106,8 @@ final class UID2PrebidTests: XCTestCase {
         )
         await observation(
             of: [
-                ExternalUserId(source: "example.com", identifier: "dog"),
-                ExternalUserId(source: "uidapi.com", identifier: "cat"),
+                ExternalUserId(source: "example.com", uids: [.init(id: "dog", aType: 1)]),
+                ExternalUserId(source: "uidapi.com", uids: [.init(id: "cat", aType: 1)]),
             ],
             by: updater
         )
@@ -111,7 +115,7 @@ final class UID2PrebidTests: XCTestCase {
         continuation.yield(.invalid)
         await observation(
             of: [
-                ExternalUserId(source: "example.com", identifier: "dog"),
+                ExternalUserId(source: "example.com", uids: [.init(id: "dog", aType: 1)]),
             ],
             by: updater
         )
@@ -141,7 +145,7 @@ extension UID2PrebidTests {
     }
     struct ExternalUserIdEquatable: Equatable {
         var source: String
-        var identifier: String
+        var identifier: String?
         var atype: Int?
 
         init(_ userId: ExternalUserId) {