diff --git a/package-lock.json b/package-lock.json
index 827b0fead..ce23ed7b8 100644
Binary files a/package-lock.json and b/package-lock.json differ
diff --git a/package.json b/package.json
index 63fdd9233..3206e54dd 100644
--- a/package.json
+++ b/package.json
@@ -98,6 +98,7 @@
         "fido2-lib": "^3.5.9",
         "file-type": "^22.0.1",
         "form-data": "^4.0.5",
+        "harmony-erlpack": "^0.0.1",
         "i18next": "^26.0.6",
         "i18next-fs-backend": "^2.6.4",
         "i18next-http-middleware": "^3.9.3",
@@ -131,7 +132,6 @@
     },
     "optionalDependencies": {
         "@sendgrid/mail": "^8.1.6",
-        "@yukikaze-bot/erlpack": "^1.0.1",
         "jimp": "^1.6.1",
         "mailgun.js": "^13.0.0",
         "node-mailjet": "^6.0.11",
diff --git a/src/gateway/events/Message.ts b/src/gateway/events/Message.ts
index 8bd1adda9..043b73768 100644
--- a/src/gateway/events/Message.ts
+++ b/src/gateway/events/Message.ts
@@ -17,7 +17,8 @@
 */
 
 import { CLOSECODES, Payload, WebSocket } from "@spacebar/gateway";
-import { ErlpackType } from "@spacebar/util";
+// import { ErlpackType } from "@spacebar/util";
+import * as erlpack from "harmony-erlpack";
 import fs from "node:fs/promises";
 import BigIntJson from "json-bigint";
 import path from "node:path";
@@ -28,12 +29,12 @@ import { PayloadSchema } from "@spacebar/schemas";
 
 const bigIntJson = BigIntJson({ storeAsString: true });
 
-let erlpack: ErlpackType | null = null;
-try {
-    erlpack = require("@yukikaze-bot/erlpack") as ErlpackType;
-} catch (e) {
-    console.log("Failed to import @yukikaze-bot/erlpack: ", e);
-}
+// let erlpack: ErlpackType | null = null;
+// try {
+//     erlpack = require("@yukikaze-bot/erlpack") as ErlpackType;
+// } catch (e) {
+//     console.log("Failed to import @yukikaze-bot/erlpack: ", e);
+// }
 
 export async function Message(this: WebSocket, buffer: WS.Data) {
     // TODO: compression
@@ -61,7 +62,8 @@ export async function Message(this: WebSocket, buffer: WS.Data) {
         data = bigIntJson.parse(buffer as string);
     } else if (this.encoding === "etf" && Buffer.isBuffer(buffer) && erlpack) {
         try {
-            data = erlpack.unpack(buffer);
+            // cast is ~safe: unpack returns the parsed data in the shape it was provided, @yukikaze-bot/erlpack got around this by returning `any` instead of an actual type union.
+            data = erlpack.unpack(buffer.buffer.slice(buffer.byteOffset, buffer.byteOffset + buffer.byteLength)) as unknown as Payload;
         } catch {
             console.error(`[Gateway/${this.user_id ?? this.ipAddress}] Failed to decode ETF payload`);
             return this.close(CLOSECODES.Decode_error);
diff --git a/src/gateway/util/Send.ts b/src/gateway/util/Send.ts
index 00fd4b454..6a9c639d7 100644
--- a/src/gateway/util/Send.ts
+++ b/src/gateway/util/Send.ts
@@ -21,12 +21,14 @@ import fs from "node:fs/promises";
 import path from "node:path";
 
 import { ErlpackType, JSONReplacer } from "@spacebar/util";
-let erlpack: ErlpackType | null = null;
-try {
-    erlpack = require("@yukikaze-bot/erlpack") as ErlpackType;
-} catch (e) {
-    console.log("Failed to import @yukikaze-bot/erlpack: ", e);
-}
+import * as erlpack from "harmony-erlpack";
+
+// let erlpack: ErlpackType | null = null;
+// try {
+//     erlpack = require("@yukikaze-bot/erlpack") as ErlpackType;
+// } catch (e) {
+//     console.log("Failed to import @yukikaze-bot/erlpack: ", e);
+// }
 
 // don't care
 // eslint-disable-next-line @typescript-eslint/no-explicit-any
@@ -58,7 +60,7 @@ export async function Send(socket: WebSocket, data: Payload) {
     if (socket.encoding === "etf" && erlpack) {
         // Erlpack doesn't like Date objects, encodes them as {}
         data = recurseJsonReplace(data);
-        buffer = erlpack.pack(data);
+        buffer = Buffer.from(erlpack.pack(data));
     }
     // TODO: encode circular object
     else if (socket.encoding === "json") buffer = JSON.stringify(data, JSONReplacer);