diff --git a/ios/Wrappers/DecodedMessageWrapper.swift b/ios/Wrappers/DecodedMessageWrapper.swift
index 72d6c2368..e9b5ed39f 100644
--- a/ios/Wrappers/DecodedMessageWrapper.swift
+++ b/ios/Wrappers/DecodedMessageWrapper.swift
@@ -41,8 +41,7 @@ struct ContentJson {
 		ReplyCodec(),
 		RemoteAttachmentCodec(),
 		ReadReceiptCodec(),
-		// TODO:
-		// CompositeCodec(),
+		GroupMembershipChangedCodec(),
 	]
 
 	static func initCodecs(client: Client) {
@@ -159,6 +158,22 @@ struct ContentJson {
 			]]
 		case ContentTypeReadReceipt.id where content is XMTP.ReadReceipt:
 			return ["readReceipt": ""]
+		case ContentTypeGroupMembershipChanged.id where content is XMTP.GroupMembershipChanges:
+			let groupChange = content as! XMTP.GroupMembershipChanges
+			return ["groupChange": [
+				"membersAdded": groupChange.membersAdded.map { member in
+					[
+						"address": member.accountAddress,
+						"initiatedByAddress": member.initiatedByAccountAddress
+					]
+				},
+				"membersRemoved": groupChange.membersRemoved.map { member in
+					[
+						"address": member.accountAddress,
+						"initiatedByAddress": member.initiatedByAccountAddress
+					]
+				},
+			]]
 		default:
 			if let encodedContent, let encodedContentJSON = try? encodedContent.jsonString() {
 				return ["encoded": encodedContentJSON]
diff --git a/src/lib/NativeCodecs/GroupChangeCodec.ts b/src/lib/NativeCodecs/GroupChangeCodec.ts
index 96b153e4d..c5d5b446e 100644
--- a/src/lib/NativeCodecs/GroupChangeCodec.ts
+++ b/src/lib/NativeCodecs/GroupChangeCodec.ts
@@ -15,7 +15,7 @@ export class GroupChangeCodec
     versionMajor: 1,
     versionMinor: 0,
   }
-
+  // Should never have to encode since only sent from Rust backend
   encode(): NativeMessageContent {
     return {}
   }
@@ -25,6 +25,6 @@ export class GroupChangeCodec
   }
 
   fallback(): string | undefined {
-    return 'The members of this group have changed'
+    return undefined
   }
 }