diff --git a/AuthX/core/jwt.py b/AuthX/core/jwt.py
index e49ec479..572529e7 100644
--- a/AuthX/core/jwt.py
+++ b/AuthX/core/jwt.py
@@ -5,17 +5,19 @@
 import jwt
 
 from AuthX.core.config import JWT_ALGORITHM
-from AuthX.database.redis import RedisBackend
 
 
 class JWTBackend:
     def __init__(
         self,
-        cache_backend: RedisBackend,
+        private_key: Optional[bytes],
+        public_key: bytes,
         access_expiration: int,
         refresh_expiration: int,
     ) -> None:
-        self._cache = cache_backend
+
+        self._private_key = private_key
+        self._public_key = public_key
         self._access_expiration = access_expiration
         self._refresh_expiration = refresh_expiration
 
@@ -42,7 +44,9 @@ async def _user_in_logout(self, id: int, iat: datetime) -> bool:
     async def decode_token(self, token: str, leeway: int = 0) -> Optional[dict]:
         if token:
             try:
-                payload = jwt.decode(token, leeway=leeway, algorithms=JWT_ALGORITHM,)
+                payload = jwt.decode(
+                    token, self._public_key, leeway=leeway, algorithms=JWT_ALGORITHM,
+                )
                 id = payload.get("id")
                 iat = datetime.utcfromtimestamp(int(payload.get("iat")))
                 checks = await asyncio.gather(
@@ -71,10 +75,10 @@ def _create_token(
 
         payload.update({"iat": iat, "exp": exp, "type": token_type})
 
-        return jwt.encode(payload, algorithm=JWT_ALGORITHM, key=None).decode()
+        return jwt.encode(payload, self._private_key, algorithm=JWT_ALGORITHM).decode()
 
     def create_access_token(self, payload: dict) -> str:
-        return self._create_token(payload, self._access_expiration, "access")
+        return self._create_token(payload, "access", self._access_expiration)
 
     def create_refresh_token(self, payload: dict) -> str:
         return self._create_token(payload, "refresh", self._refresh_expiration)
diff --git a/requirements.txt b/requirements.txt
index 23736751..ca99e0c9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,9 +6,7 @@ astroid
 async-timeout
 atomicwrites
 attrs
-autoflake
 bcrypt
-black
 certifi
 cffi
 charset-normalizer
@@ -19,7 +17,6 @@ cryptography
 dnspython
 email-validator
 fastapi
-flake8
 h11
 httpcore
 httpx
diff --git a/tests/core/test_core_email.py b/tests/core/test_core_email.py
new file mode 100644
index 00000000..ba59c2ba
--- /dev/null
+++ b/tests/core/test_core_email.py
@@ -0,0 +1,14 @@
+from unittest import mock
+
+import pytest
+
+from AuthX.core.email import EmailClient
+
+
+@pytest.mark.asyncio
+@pytest.mark.parametrize("language", ["en"])
+@mock.patch("aiosmtplib.send", mock.AsyncMock(return_value=None))
+async def test_email_client(language: str):
+    email_client = EmailClient(None, None, None, None, language, "", "", "")
+    await email_client.send_confirmation_email("", "")
+    await email_client.send_forgot_password_email("", "")