diff --git a/src/app/core/config.py b/src/app/core/config.py
index 4730131..a6cd8a6 100644
--- a/src/app/core/config.py
+++ b/src/app/core/config.py
@@ -2,6 +2,7 @@
 from enum import Enum
 
 from pydantic_settings import BaseSettings
+from pydantic import SecretStr
 from starlette.config import Config
 
 current_file_dir = os.path.dirname(os.path.realpath(__file__))
@@ -19,7 +20,7 @@ class AppSettings(BaseSettings):
 
 
 class CryptSettings(BaseSettings):
-    SECRET_KEY: str = config("SECRET_KEY")
+    SECRET_KEY: SecretStr = config("SECRET_KEY", cast=SecretStr)
     ALGORITHM: str = config("ALGORITHM", default="HS256")
     ACCESS_TOKEN_EXPIRE_MINUTES: int = config("ACCESS_TOKEN_EXPIRE_MINUTES", default=30)
     REFRESH_TOKEN_EXPIRE_DAYS: int = config("REFRESH_TOKEN_EXPIRE_DAYS", default=7)
diff --git a/src/app/core/security.py b/src/app/core/security.py
index f0c9fa4..b7b4b03 100644
--- a/src/app/core/security.py
+++ b/src/app/core/security.py
@@ -6,6 +6,7 @@
 from fastapi.security import OAuth2PasswordBearer
 from jose import JWTError, jwt
 from sqlalchemy.ext.asyncio import AsyncSession
+from Pydantic import SecretStr
 
 from ..crud.crud_users import crud_users
 from .config import settings
@@ -13,7 +14,7 @@
 from .schemas import TokenBlacklistCreate, TokenData
 
 
-SECRET_KEY = settings.SECRET_KEY
+SECRET_KEY: SecretStr = settings.SECRET_KEY
 ALGORITHM = settings.ALGORITHM
 ACCESS_TOKEN_EXPIRE_MINUTES = settings.ACCESS_TOKEN_EXPIRE_MINUTES
 REFRESH_TOKEN_EXPIRE_DAYS = settings.REFRESH_TOKEN_EXPIRE_DAYS
@@ -57,7 +58,7 @@ async def create_access_token(data: dict[str, Any], expires_delta: timedelta | N
     else:
         expire = datetime.now(UTC).replace(tzinfo=None) + timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES)
     to_encode.update({"exp": expire, "token_type": TokenType.ACCESS})
-    encoded_jwt: str = jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
+    encoded_jwt: str = jwt.encode(to_encode, SECRET_KEY.get_secret_value(), algorithm=ALGORITHM)
     return encoded_jwt
 
 
@@ -68,7 +69,7 @@ async def create_refresh_token(data: dict[str, Any], expires_delta: timedelta |
     else:
         expire = datetime.now(UTC).replace(tzinfo=None) + timedelta(days=REFRESH_TOKEN_EXPIRE_DAYS)
     to_encode.update({"exp": expire, "token_type": TokenType.REFRESH})
-    encoded_jwt: str = jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
+    encoded_jwt: str = jwt.encode(to_encode, SECRET_KEY.get_secret_value(), algorithm=ALGORITHM)
     return encoded_jwt
 
 
@@ -94,7 +95,7 @@ async def verify_token(token: str, expected_token_type: TokenType, db: AsyncSess
         return None
 
     try:
-        payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
+        payload = jwt.decode(token, SECRET_KEY.get_secret_value(), algorithms=[ALGORITHM])
         username_or_email: str = payload.get("sub")
         token_type: str = payload.get("token_type")
         
@@ -120,7 +121,7 @@ async def blacklist_tokens(access_token: str, refresh_token: str, db: AsyncSessi
         Database session for performing database operations.
     """
     for token in [access_token, refresh_token]:
-        payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
+        payload = jwt.decode(token, SECRET_KEY.get_secret_value(), algorithms=[ALGORITHM])
         expires_at = datetime.fromtimestamp(payload.get("exp"))
         await crud_token_blacklist.create(
             db, 
@@ -131,7 +132,7 @@ async def blacklist_tokens(access_token: str, refresh_token: str, db: AsyncSessi
         )
 
 async def blacklist_token(token: str, db: AsyncSession) -> None:
-    payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
+    payload = jwt.decode(token, SECRET_KEY.get_secret_value(), algorithms=[ALGORITHM])
     expires_at = datetime.fromtimestamp(payload.get("exp"))
     await crud_token_blacklist.create(
         db,