diff --git a/src/components/ChannelList/ChannelListItem.tsx b/src/components/ChannelList/ChannelListItem.tsx
index 6f5fc81..5a18378 100644
--- a/src/components/ChannelList/ChannelListItem.tsx
+++ b/src/components/ChannelList/ChannelListItem.tsx
@@ -4,13 +4,13 @@ import { useNavigate } from "react-router-dom";
 import styled from "styled-components";
 import { ContextMenuContext } from "../../contexts/ContextMenuContext";
 import { modalController } from "../../controllers/modals";
+import { useAppStore } from "../../hooks/useAppStore";
 import Channel from "../../stores/objects/Channel";
 import { Permissions } from "../../utils/Permissions";
 import Icon from "../Icon";
 import SidebarPill from "../SidebarPill";
 import Floating from "../floating/Floating";
 import FloatingTrigger from "../floating/FloatingTrigger";
-import { useAppStore } from "../../hooks/useAppStore";
 
 const ListItem = styled.div<{ isCategory?: boolean }>`
 	padding: ${(props) => (props.isCategory ? "16px 8px 0 0" : "1px 8px 0 0")};
@@ -90,7 +90,7 @@ function ChannelListItem({ channel, isCategory, active }: Props) {
 						alignItems: "center",
 					}}
 				>
-					<SidebarPill type={channel.hasUnread() ? "unread" : "none"} />
+					<SidebarPill type={channel.unread ? "unread" : "none"} />
 					{channel.channelIcon && !isCategory && (
 						<Icon
 							icon={channel.channelIcon}
diff --git a/src/components/messaging/Chat.tsx b/src/components/messaging/Chat.tsx
index afaad0c..723992f 100644
--- a/src/components/messaging/Chat.tsx
+++ b/src/components/messaging/Chat.tsx
@@ -1,6 +1,6 @@
 import { runInAction } from "mobx";
 import { observer } from "mobx-react-lite";
-import React from "react";
+import React, { useEffect } from "react";
 import styled from "styled-components";
 import { useAppStore } from "../../hooks/useAppStore";
 import useLogger from "../../hooks/useLogger";
@@ -57,6 +57,10 @@ function ChatContent({ channel, guild }: Props2) {
 	const app = useAppStore();
 	const readstate = app.readStateStore.get(channel.id);
 
+	useEffect(() => {
+		channel.markAsRead();
+	}, [channel, guild]);
+
 	return (
 		<Container>
 			<MessageList guild={guild} channel={channel} before={readstate?.lastMessageId} />
diff --git a/src/stores/GatewayConnectionStore.ts b/src/stores/GatewayConnectionStore.ts
index 1d2d3e9..2fef56e 100644
--- a/src/stores/GatewayConnectionStore.ts
+++ b/src/stores/GatewayConnectionStore.ts
@@ -143,6 +143,8 @@ export default class GatewayConnectionStore {
 		this.dispatchHandlers.set(GatewayDispatchEvents.ChannelCreate, this.onChannelCreate);
 		this.dispatchHandlers.set(GatewayDispatchEvents.ChannelUpdate, this.onChannelUpdate);
 		this.dispatchHandlers.set(GatewayDispatchEvents.ChannelDelete, this.onChannelDelete);
+		// @ts-expect-error missing event in typings
+		this.dispatchHandlers.set("MESSAGE_ACK", this.onMessageAck);
 
 		this.dispatchHandlers.set(GatewayDispatchEvents.MessageCreate, this.onMessageCreate);
 		this.dispatchHandlers.set(GatewayDispatchEvents.MessageUpdate, this.onMessageUpdate);
@@ -633,6 +635,23 @@ export default class GatewayConnectionStore {
 		guild.removeChannel(data.id);
 	};
 
+	private onMessageAck = (data: { channel_id: string; message_id: string; version: number }) => {
+		// get readstate for channel
+		const readstate = this.app.readStateStore.get(data.channel_id);
+		if (!readstate) {
+			this.logger.warn(`[MessageAck] Readstate not found for channel ${data.channel_id}`);
+			return;
+		}
+
+		runInAction(() => {
+			readstate.lastMessageId = data.message_id;
+		});
+
+		this.logger.debug(
+			`[MessageAck] Updated last message id for channel readstate ${data.channel_id} to ${data.message_id}`,
+		);
+	};
+
 	private onMessageCreate = (data: GatewayMessageCreateDispatchData) => {
 		const guild = this.app.guilds.get(data.guild_id!);
 		if (!guild) {
diff --git a/src/stores/objects/Channel.ts b/src/stores/objects/Channel.ts
index 5a767a8..35f42c8 100644
--- a/src/stores/objects/Channel.ts
+++ b/src/stores/objects/Channel.ts
@@ -311,7 +311,8 @@ export default class Channel {
 		return listId;
 	}
 
-	hasUnread() {
+	@computed
+	get unread() {
 		const readState = this.app.readStateStore.get(this.id);
 		if (!readState) {
 			// this.logger.warn(`Failed to find readstate for channel ${this.id}`); // this just causes unnecessary spam
@@ -320,4 +321,23 @@ export default class Channel {
 
 		return readState.lastMessageId !== this.lastMessageId;
 	}
+
+	markAsRead() {
+		const readState = this.app.readStateStore.get(this.id);
+		if (!readState) {
+			this.logger.warn(`Failed to find readstate for channel ${this.id}`); // this just causes unnecessary spam
+			return;
+		}
+
+		this.app.rest
+			.post(Routes.channelMessage(this.id, readState.lastMessageId) + "/ack", {
+				mention_count: readState.mentionCount,
+			})
+			.then((r) => {
+				this.logger.debug(`Acked ${this.lastMessageId} for channel ${this.id}`, r);
+			})
+			.catch((e) => {
+				this.logger.error(`Failed to ack ${this.lastMessageId} for channel ${this.id}`, e);
+			});
+	}
 }
diff --git a/src/stores/objects/ReadState.ts b/src/stores/objects/ReadState.ts
index a4b255d..9b6c530 100644
--- a/src/stores/objects/ReadState.ts
+++ b/src/stores/objects/ReadState.ts
@@ -1,8 +1,10 @@
-import type { APIReadState } from "@spacebarchat/spacebar-api-types/v9";
+import { type APIReadState } from "@spacebarchat/spacebar-api-types/v9";
 import { action, observable } from "mobx";
+import Logger from "../../utils/Logger";
 import AppStore from "../AppStore";
 
 export default class ReadState {
+	private readonly logger: Logger;
 	private readonly app: AppStore;
 
 	id: string;
@@ -11,9 +13,10 @@ export default class ReadState {
 	@observable mentionCount: number | null;
 
 	constructor(app: AppStore, data: APIReadState) {
+		this.logger = new Logger("ReadState");
 		this.app = app;
 
-		this.id = data.id;
+		this.id = data.id; // channel id
 		this.lastMessageId = data.last_message_id;
 		this.lastPinTimestamp = data.last_pin_timestamp;
 		this.mentionCount = data.mention_count;