diff --git a/packages/discord.js/src/structures/PartialGroupDMChannel.js b/packages/discord.js/src/structures/PartialGroupDMChannel.js
index 7c79f1eec439..935ca5f5c65c 100644
--- a/packages/discord.js/src/structures/PartialGroupDMChannel.js
+++ b/packages/discord.js/src/structures/PartialGroupDMChannel.js
@@ -54,6 +54,35 @@ class PartialGroupDMChannel extends BaseChannel {
     } else {
       this.ownerId ??= null;
     }
+
+    if ('last_message_id' in data) {
+      /**
+       * The channel's last message id, if one was sent
+       * @type {?Snowflake}
+       */
+      this.lastMessageId = data.last_message_id;
+    } else {
+      this.lastMessageId ??= null;
+    }
+
+    if ('last_pin_timestamp' in data) {
+      /**
+       * The timestamp when the last pinned message was pinned, if there was one
+       * @type {?number}
+       */
+      this.lastPinTimestamp = data.last_pin_timestamp;
+    } else {
+      this.lastPinTimestamp ??= null;
+    }
+  }
+
+  /**
+   * The date when the last pinned message was pinned, if there was one
+   * @type {?Date}
+   * @readonly
+   */
+  get lastPinAt() {
+    return this.lastPinTimestamp && new Date(this.lastPinTimestamp);
   }
 
   /**
diff --git a/packages/discord.js/typings/index.d.ts b/packages/discord.js/typings/index.d.ts
index a07efa12791b..d8da64f2e4c5 100644
--- a/packages/discord.js/typings/index.d.ts
+++ b/packages/discord.js/typings/index.d.ts
@@ -2559,6 +2559,9 @@ export class PartialGroupDMChannel extends BaseChannel {
   public recipients: PartialRecipient[];
   public messages: PartialGroupDMMessageManager;
   public ownerId: Snowflake | null;
+  public lastMessageId: Snowflake | null;
+  public lastPinTimestamp: number | null;
+  get lastPinAt(): Date | null;
   public iconURL(options?: ImageURLOptions): string | null;
   public fetchOwner(options?: BaseFetchOptions): Promise<User>;
   public toString(): ChannelMention;