diff --git a/index.d.ts b/index.d.ts
index 74b0dc0e..8cdb5c2d 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -2225,6 +2225,7 @@ declare namespace Dysnomia {
       LOADING:                                128;
       FAILED_TO_MENTION_SOME_ROLES_IN_THREAD: 256;
       SUPPRESS_NOTIFICATIONS:                 4096;
+      IS_VOICE_MESSAGE:                       8192;
     };
     MessageTypes: {
       DEFAULT:                                      0;
@@ -2328,10 +2329,11 @@ declare namespace Dysnomia {
       moderateMembers:                  1099511627776n;
       viewCreatorMonetizationAnalytics: 2199023255552n;
       useSoundboard:                    4398046511104n;
+      sendVoiceMessages:                70368744177664n;
       allGuild:                         3309205717182n;
-      allText:                          535529258065n;
+      allText:                          70904273435729n;
       allVoice:                         4952431789841n;
-      all:                              8796093022207n;
+      all:                              79164837199871n;
     };
     PremiumTiers: {
       NONE:   0;
@@ -2534,6 +2536,7 @@ declare namespace Dysnomia {
   export class Attachment extends Base {
     contentType?: string;
     description?: string;
+    durationSecs?: number;
     ephemeral?: boolean;
     filename: string;
     height?: number;
@@ -2541,6 +2544,7 @@ declare namespace Dysnomia {
     proxyURL: string;
     size: number;
     url: string;
+    waveform?: string;
     width?: number;
     constructor(data: BaseData);
   }
diff --git a/lib/Constants.js b/lib/Constants.js
index 0ea7d2bb..44af7496 100644
--- a/lib/Constants.js
+++ b/lib/Constants.js
@@ -406,7 +406,8 @@ module.exports.MessageFlags = {
     EPHEMERAL:                              1 << 6,
     LOADING:                                1 << 7,
     FAILED_TO_MENTION_SOME_ROLES_IN_THREAD: 1 << 8,
-    SUPPRESS_NOTIFICATIONS:                 1 << 12
+    SUPPRESS_NOTIFICATIONS:                 1 << 12,
+    IS_VOICE_MESSAGE:                       1 << 13
 };
 
 module.exports.MessageTypes = {
@@ -502,7 +503,8 @@ const Permissions = {
     startEmbeddedActivities:          1n << 39n,
     moderateMembers:                  1n << 40n,
     viewCreatorMonetizationAnalytics: 1n << 41n,
-    useSoundboard:                    1n << 42n
+    useSoundboard:                    1n << 42n,
+    sendVoiceMessages:                1n << 46n
 };
 Permissions.allGuild = Permissions.kickMembers
     | Permissions.banMembers
@@ -538,7 +540,8 @@ Permissions.allText = Permissions.createInstantInvite
     | Permissions.createPublicThreads
     | Permissions.createPrivateThreads
     | Permissions.useExternalStickers
-    | Permissions.sendMessagesInThreads;
+    | Permissions.sendMessagesInThreads
+    | Permissions.sendVoiceMessages;
 Permissions.allVoice = Permissions.createInstantInvite
     | Permissions.manageChannels
     | Permissions.voicePrioritySpeaker
diff --git a/lib/structures/Attachment.js b/lib/structures/Attachment.js
index bd550d83..5fda4e02 100644
--- a/lib/structures/Attachment.js
+++ b/lib/structures/Attachment.js
@@ -6,6 +6,7 @@ const Base = require("./Base");
  * Represents an attachment
  * @prop {String?} contentType The content type of the attachment
  * @prop {String?} description The description of the attachment
+ * @prop {Number?} durationSecs The duration of the audio file (voice messages only)
  * @prop {Boolean?} ephemeral Whether the attachment is ephemeral
  * @prop {String} filename The filename of the attachment
  * @prop {Number?} height The height of the attachment
@@ -13,6 +14,7 @@ const Base = require("./Base");
  * @prop {String} proxyURL The proxy URL of the attachment
  * @prop {Number} size The size of the attachment
  * @prop {String} url The URL of the attachment
+ * @prop {String?} waveform A Base64-encoded byte array representing the sampled waveform of the audio file (voice messages only)
  * @prop {Number?} width The width of the attachment
  */
 class Attachment extends Base {
@@ -23,6 +25,8 @@ class Attachment extends Base {
         this.size = data.size;
         this.url = data.url;
         this.proxyURL = data.proxy_url;
+        this.durationSecs = data.duration_secs;
+        this.waveform = data.waveform;
         this.update(data);
     }
 
@@ -55,6 +59,8 @@ class Attachment extends Base {
             "height",
             "width",
             "ephemeral",
+            "durationSecs",
+            "waveform",
             ...props
         ]);
     }