diff --git a/remnawave/utils/happ_crypt.py b/remnawave/utils/happ_crypt.py
index 972f670..1972704 100644
--- a/remnawave/utils/happ_crypt.py
+++ b/remnawave/utils/happ_crypt.py
@@ -1,4 +1,5 @@
 import base64
+from typing import Literal
 
 from cryptography.hazmat.primitives import hashes, serialization
 from cryptography.hazmat.primitives.asymmetric import padding
@@ -20,10 +21,32 @@ VE0tje7twWXL5Gb1sfcXRzsCAwEAAQ==
 -----END PUBLIC KEY-----
 """
 
+HAPP_PUBLIC_KEY_V4 = b"""
+-----BEGIN PUBLIC KEY-----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+-----END PUBLIC KEY-----
+"""
 
-def create_happ_crypto_link(content: str) -> str:
+
+
+def create_happ_crypto_link(content: str, method: Literal["v3", "v4"] = "v4") -> str:
     try:
-        public_key = serialization.load_pem_public_key(HAPP_PUBLIC_KEY_V3)
+        happ_methods = {
+            "v3": HAPP_PUBLIC_KEY_V3,
+            "v4": HAPP_PUBLIC_KEY_V4,
+        }
+        public_key = serialization.load_pem_public_key(happ_methods[method.lower()])
 
         encrypted = public_key.encrypt(
             content.encode("utf-8"), padding.PKCS1v15()  # RSA_PKCS1_PADDING