diff --git a/package.json b/package.json
index 107308a..cfb213a 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@xtr-dev/rondevu-client",
-  "version": "0.7.11",
+  "version": "0.7.12",
   "description": "TypeScript client for Rondevu topic-based peer discovery and signaling server",
   "type": "module",
   "main": "dist/index.js",
diff --git a/src/auth.ts b/src/auth.ts
index 10e1d3c..8fc5c33 100644
--- a/src/auth.ts
+++ b/src/auth.ts
@@ -29,21 +29,16 @@ export class RondevuAuth {
 
   /**
    * Register a new peer and receive credentials
-   * @param customPeerId - Optional custom peer ID (1-128 characters). If not provided, a random ID will be generated.
-   * @throws Error if registration fails (e.g., peer ID already in use)
+   * Generates a cryptographically random peer ID (128-bit)
+   * @throws Error if registration fails
    */
-  async register(customPeerId?: string): Promise<Credentials> {
-    const body: { peerId?: string } = {};
-    if (customPeerId !== undefined) {
-      body.peerId = customPeerId;
-    }
-
+  async register(): Promise<Credentials> {
     const response = await this.fetchFn(`${this.baseUrl}/register`, {
       method: 'POST',
       headers: {
         'Content-Type': 'application/json',
       },
-      body: JSON.stringify(body),
+      body: JSON.stringify({}),
     });
 
     if (!response.ok) {
diff --git a/src/rondevu.ts b/src/rondevu.ts
index 0428e26..6f30a93 100644
--- a/src/rondevu.ts
+++ b/src/rondevu.ts
@@ -100,10 +100,10 @@ export class Rondevu {
 
   /**
    * Register and initialize authenticated client
-   * @param customPeerId - Optional custom peer ID (1-128 characters). If not provided, a random ID will be generated.
+   * Generates a cryptographically random peer ID (128-bit)
    */
-  async register(customPeerId?: string): Promise<Credentials> {
-    this.credentials = await this.auth.register(customPeerId);
+  async register(): Promise<Credentials> {
+    this.credentials = await this.auth.register();
 
     // Create offers API instance
     this._offers = new RondevuOffers(