diff --git a/packages/bot/src/events.ts b/packages/bot/src/events.ts
index bb78841de..73b937b34 100644
--- a/packages/bot/src/events.ts
+++ b/packages/bot/src/events.ts
@@ -42,15 +42,7 @@ export type EventHandlers<TProps extends TransformersDesiredProperties, TBehavio
     threads: SetupDesiredProps<Channel, TProps, TBehavior>[]
     members: ThreadMember[]
   }) => unknown
-  threadMemberUpdate: (payload: {
-    id: bigint
-    guildId: bigint
-    // TODO: remove this in the next major version
-    /** @deprecated Use joinedTimestamp */
-    joinedAt: number
-    joinedTimestamp: number
-    flags: number
-  }) => unknown
+  threadMemberUpdate: (payload: { id: bigint; guildId: bigint; joinedTimestamp: number; flags: number }) => unknown
   threadMembersUpdate: (payload: { id: bigint; guildId: bigint; addedMembers?: ThreadMember[]; removedMemberIds?: bigint[] }) => unknown
   threadUpdate: (thread: SetupDesiredProps<Channel, TProps, TBehavior>) => unknown
   scheduledEventCreate: (event: SetupDesiredProps<ScheduledEvent, TProps, TBehavior>) => unknown
diff --git a/packages/bot/src/handlers/channels/THREAD_MEMBER_UPDATE.ts b/packages/bot/src/handlers/channels/THREAD_MEMBER_UPDATE.ts
index ca1bf3a31..330c38c93 100644
--- a/packages/bot/src/handlers/channels/THREAD_MEMBER_UPDATE.ts
+++ b/packages/bot/src/handlers/channels/THREAD_MEMBER_UPDATE.ts
@@ -9,8 +9,6 @@ export async function handleThreadMemberUpdate(bot: Bot, data: DiscordGatewayPay
   bot.events.threadMemberUpdate({
     id: bot.transformers.snowflake(payload.id),
     guildId: bot.transformers.snowflake(payload.guild_id),
-    // TODO: remove this in the next major version
-    joinedAt: 'joined_at' in payload && typeof payload.joined_at === 'string' ? Date.parse(payload.joined_at) : 0,
     joinedTimestamp: Date.parse(payload.join_timestamp),
     flags: payload.flags,
   })