diff --git a/package-lock.json b/package-lock.json
index cc1d8ae896..1f86f4aa3c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -10,7 +10,7 @@
       "license": "Apache-2.0",
       "dependencies": {
         "@mongodb-js/saslprep": "^1.3.0",
-        "bson": "^7.0.0",
+        "bson": "mongodb/js-bson",
         "mongodb-connection-string-url": "^7.0.0"
       },
       "devDependencies": {
@@ -3916,8 +3916,7 @@
     },
     "node_modules/bson": {
       "version": "7.0.0",
-      "resolved": "https://registry.npmjs.org/bson/-/bson-7.0.0.tgz",
-      "integrity": "sha512-Kwc6Wh4lQ5OmkqqKhYGKIuELXl+EPYSCObVE6bWsp1T/cGkOCBN0I8wF/T44BiuhHyNi1mmKVPXk60d41xZ7kw==",
+      "resolved": "git+ssh://git@github.com/mongodb/js-bson.git#a23e788eded5253f7e1295c36e3187363971ab8c",
       "license": "Apache-2.0",
       "engines": {
         "node": ">=20.19.0"
diff --git a/package.json b/package.json
index ba67923095..57d01ccea0 100644
--- a/package.json
+++ b/package.json
@@ -26,7 +26,7 @@
   },
   "dependencies": {
     "@mongodb-js/saslprep": "^1.3.0",
-    "bson": "^7.0.0",
+    "bson": "mongodb/js-bson",
     "mongodb-connection-string-url": "^7.0.0"
   },
   "peerDependencies": {
diff --git a/src/bson.ts b/src/bson.ts
index f9db54dc42..c08cd03896 100644
--- a/src/bson.ts
+++ b/src/bson.ts
@@ -22,6 +22,7 @@ export {
   Long,
   MaxKey,
   MinKey,
+  NumberUtils,
   ObjectId,
   type ObjectIdLike,
   serialize,
diff --git a/src/cmap/handshake/client_metadata.ts b/src/cmap/handshake/client_metadata.ts
index aa5cb70e7b..d01fa0c095 100644
--- a/src/cmap/handshake/client_metadata.ts
+++ b/src/cmap/handshake/client_metadata.ts
@@ -1,7 +1,7 @@
 import * as os from 'os';
 import * as process from 'process';
 
-import { BSON, type Document, Int32 } from '../../bson';
+import { BSON, type Document, Int32, NumberUtils } from '../../bson';
 import { MongoInvalidArgumentError } from '../../error';
 import type { DriverInfo, MongoOptions } from '../../mongo_client';
 import { fileIsAccessible } from '../../utils';
@@ -336,17 +336,18 @@ declare const Bun: { (): void; version?: string } | undefined;
  * with a future change to these global objects.
  */
 function getRuntimeInfo(): string {
+  const endianness = NumberUtils.isBigEndian ? 'BE' : 'LE';
   if ('Deno' in globalThis) {
     const version = typeof Deno?.version?.deno === 'string' ? Deno?.version?.deno : '0.0.0-unknown';
 
-    return `Deno v${version}, ${os.endianness()}`;
+    return `Deno v${version}, ${endianness}`;
   }
 
   if ('Bun' in globalThis) {
     const version = typeof Bun?.version === 'string' ? Bun?.version : '0.0.0-unknown';
 
-    return `Bun v${version}, ${os.endianness()}`;
+    return `Bun v${version}, ${endianness}`;
   }
 
-  return `Node.js ${process.version}, ${os.endianness()}`;
+  return `Node.js ${process.version}, ${endianness}`;
 }