diff --git a/libp2p/transport/quic/connection.py b/libp2p/transport/quic/connection.py
index ecb100d4..d6b53519 100644
--- a/libp2p/transport/quic/connection.py
+++ b/libp2p/transport/quic/connection.py
@@ -76,7 +76,7 @@ class QUICConnection(IRawConnection, IMuxedConn):
         resource_scope: Any | None = None,
     ):
         """
-        Initialize enhanced QUIC connection with security integration.
+        Initialize QUIC connection with security integration.
 
         Args:
             quic_connection: aioquic QuicConnection instance
@@ -105,7 +105,7 @@ class QUICConnection(IRawConnection, IMuxedConn):
         self._connected_event = trio.Event()
         self._closed_event = trio.Event()
 
-        # Enhanced stream management
+        # Stream management
         self._streams: dict[int, QUICStream] = {}
         self._next_stream_id: int = self._calculate_initial_stream_id()
         self._stream_handler: TQUICStreamHandlerFn | None = None
@@ -129,8 +129,8 @@ class QUICConnection(IRawConnection, IMuxedConn):
         self._peer_verified = False
 
         # Security state
-        self._peer_certificate: Optional[x509.Certificate] = None
-        self._handshake_events = []
+        self._peer_certificate: x509.Certificate | None = None
+        self._handshake_events: list[events.HandshakeCompleted] = []
 
         # Background task management
         self._background_tasks_started = False
@@ -466,7 +466,7 @@ class QUICConnection(IRawConnection, IMuxedConn):
                     f"Alternative certificate extraction also failed: {inner_e}"
                 )
 
-    async def get_peer_certificate(self) -> Optional[x509.Certificate]:
+    async def get_peer_certificate(self) -> x509.Certificate | None:
         """
         Get the peer's TLS certificate.
 
@@ -511,7 +511,7 @@ class QUICConnection(IRawConnection, IMuxedConn):
 
     def get_security_info(self) -> dict[str, Any]:
         """Get security-related information about the connection."""
-        info: dict[str, bool | Any | None]= {
+        info: dict[str, bool | Any | None] = {
             "peer_verified": self._peer_verified,
             "handshake_complete": self._handshake_completed,
             "peer_id": str(self._peer_id) if self._peer_id else None,
@@ -534,7 +534,7 @@ class QUICConnection(IRawConnection, IMuxedConn):
                         ),
                         "certificate_not_after": (
                             self._peer_certificate.not_valid_after.isoformat()
-                            ),
+                        ),
                     }
                 )
             except Exception as e:
@@ -574,7 +574,7 @@ class QUICConnection(IRawConnection, IMuxedConn):
 
     async def open_stream(self, timeout: float = 5.0) -> QUICStream:
         """
-        Open a new outbound stream with enhanced error handling and resource management.
+        Open a new outbound stream
 
         Args:
             timeout: Timeout for stream creation
@@ -607,7 +607,6 @@ class QUICConnection(IRawConnection, IMuxedConn):
                 stream_id = self._next_stream_id
                 self._next_stream_id += 4  # Increment by 4 for bidirectional streams
 
-                # Create enhanced stream
                 stream = QUICStream(
                     connection=self,
                     stream_id=stream_id,
@@ -766,7 +765,7 @@ class QUICConnection(IRawConnection, IMuxedConn):
         self._closed_event.set()
 
     async def _handle_stream_data(self, event: events.StreamDataReceived) -> None:
-        """Enhanced stream data handling with proper error management."""
+        """Stream data handling with proper error management."""
         stream_id = event.stream_id
         self._stats["bytes_received"] += len(event.data)
 
@@ -858,7 +857,7 @@ class QUICConnection(IRawConnection, IMuxedConn):
             return stream_id % 2 == 0
 
     async def _handle_stream_reset(self, event: events.StreamReset) -> None:
-        """Enhanced stream reset handling."""
+        """Stream reset handling."""
         stream_id = event.stream_id
         self._stats["streams_reset"] += 1
 
@@ -925,7 +924,7 @@ class QUICConnection(IRawConnection, IMuxedConn):
     # Connection close
 
     async def close(self) -> None:
-        """Enhanced connection close with proper stream cleanup."""
+        """Connection close with proper stream cleanup."""
         if self._closed:
             return
 
diff --git a/libp2p/transport/quic/listener.py b/libp2p/transport/quic/listener.py
index 354d325b..91a9c007 100644
--- a/libp2p/transport/quic/listener.py
+++ b/libp2p/transport/quic/listener.py
@@ -8,7 +8,7 @@ import copy
 import logging
 import socket
 import time
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, Optional
 
 from aioquic.quic import events
 from aioquic.quic.configuration import QuicConfiguration
@@ -18,6 +18,7 @@ import trio
 
 from libp2p.abc import IListener
 from libp2p.custom_types import THandler, TProtocol
+from libp2p.transport.quic.security import QUICTLSConfigManager
 
 from .config import QUICTransportConfig
 from .connection import QUICConnection
@@ -51,6 +52,7 @@ class QUICListener(IListener):
         handler_function: THandler,
         quic_configs: dict[TProtocol, QuicConfiguration],
         config: QUICTransportConfig,
+        security_manager: QUICTLSConfigManager | None = None,
     ):
         """
         Initialize QUIC listener.
@@ -60,12 +62,14 @@ class QUICListener(IListener):
             handler_function: Function to handle new connections
             quic_configs: QUIC configurations for different versions
             config: QUIC transport configuration
+            security_manager: Security manager for TLS/certificate handling
 
         """
         self._transport = transport
         self._handler = handler_function
         self._quic_configs = quic_configs
         self._config = config
+        self._security_manager = security_manager
 
         # Network components
         self._socket: trio.socket.SocketType | None = None
@@ -117,8 +121,10 @@ class QUICListener(IListener):
             host, port = quic_multiaddr_to_endpoint(maddr)
             quic_version = multiaddr_to_quic_version(maddr)
 
+            protocol = f"{quic_version}_server"
+
             # Validate QUIC version support
-            if quic_version not in self._quic_configs:
+            if protocol not in self._quic_configs:
                 raise QUICListenError(f"Unsupported QUIC version: {quic_version}")
 
             # Create and bind UDP socket
@@ -379,6 +385,7 @@ class QUICListener(IListener):
                 is_initiator=False,  # We're the server
                 maddr=remote_maddr,
                 transport=self._transport,
+                security_manager=self._security_manager,
             )
 
             # Store the connection
@@ -389,8 +396,16 @@ class QUICListener(IListener):
                 self._nursery.start_soon(connection._handle_datagram_received)
                 self._nursery.start_soon(connection._handle_timer_events)
 
-            # TODO: Verify peer identity
-            # await connection.verify_peer_identity()
+            if self._security_manager:
+                try:
+                    await connection._verify_peer_identity_with_security()
+                    logger.info(f"Security verification successful for {addr}")
+                except Exception as e:
+                    logger.error(f"Security verification failed for {addr}: {e}")
+                    self._stats["security_failures"] += 1
+                    # Close the connection due to security failure
+                    await connection.close()
+                    return
 
             # Call the connection handler
             if self._nursery:
@@ -569,6 +584,16 @@ class QUICListener(IListener):
         )
         return stats
 
+    def get_security_manager(self) -> Optional["QUICTLSConfigManager"]:
+        """
+        Get the security manager for this listener.
+
+        Returns:
+            The QUIC TLS configuration manager, or None if not configured
+
+        """
+        return self._security_manager
+
     def __str__(self) -> str:
         """String representation of the listener."""
         addr = self._bound_addresses
diff --git a/libp2p/transport/quic/security.py b/libp2p/transport/quic/security.py
index e11979c2..82132b6b 100644
--- a/libp2p/transport/quic/security.py
+++ b/libp2p/transport/quic/security.py
@@ -5,18 +5,19 @@ Based on go-libp2p and js-libp2p security patterns.
 """
 
 from dataclasses import dataclass
+from datetime import datetime, timedelta
 import logging
-import time
-from typing import Optional, Tuple
 
 from cryptography import x509
 from cryptography.hazmat.primitives import hashes, serialization
 from cryptography.hazmat.primitives.asymmetric import ec, rsa
+from cryptography.hazmat.primitives.asymmetric.ec import EllipticCurvePrivateKey
+from cryptography.hazmat.primitives.asymmetric.rsa import RSAPrivateKey
+from cryptography.x509.base import Certificate
 from cryptography.x509.oid import NameOID
 
-from libp2p.crypto.ed25519 import Ed25519PublicKey
 from libp2p.crypto.keys import PrivateKey, PublicKey
-from libp2p.crypto.secp256k1 import Secp256k1PublicKey
+from libp2p.crypto.serialization import deserialize_public_key
 from libp2p.peer.id import ID
 
 from .exceptions import (
@@ -24,6 +25,11 @@ from .exceptions import (
     QUICPeerVerificationError,
 )
 
+TSecurityConfig = dict[
+    str,
+    Certificate | EllipticCurvePrivateKey | RSAPrivateKey | bool | list[str],
+]
+
 logger = logging.getLogger(__name__)
 
 # libp2p TLS Extension OID - Official libp2p specification
@@ -34,6 +40,7 @@ CERTIFICATE_VALIDITY_DAYS = 365
 CERTIFICATE_NOT_BEFORE_BUFFER = 3600  # 1 hour before now
 
 
+@dataclass
 @dataclass
 class TLSConfig:
     """TLS configuration for QUIC transport with libp2p extensions."""
@@ -43,17 +50,29 @@ class TLSConfig:
     peer_id: ID
 
     def get_certificate_der(self) -> bytes:
-        """Get certificate in DER format for aioquic."""
+        """Get certificate in DER format for external use."""
         return self.certificate.public_bytes(serialization.Encoding.DER)
 
     def get_private_key_der(self) -> bytes:
-        """Get private key in DER format for aioquic."""
+        """Get private key in DER format for external use."""
         return self.private_key.private_bytes(
             encoding=serialization.Encoding.DER,
             format=serialization.PrivateFormat.PKCS8,
             encryption_algorithm=serialization.NoEncryption(),
         )
 
+    def get_certificate_pem(self) -> bytes:
+        """Get certificate in PEM format."""
+        return self.certificate.public_bytes(serialization.Encoding.PEM)
+
+    def get_private_key_pem(self) -> bytes:
+        """Get private key in PEM format."""
+        return self.private_key.private_bytes(
+            encoding=serialization.Encoding.PEM,
+            format=serialization.PrivateFormat.PKCS8,
+            encryption_algorithm=serialization.NoEncryption(),
+        )
+
 
 class LibP2PExtensionHandler:
     """
@@ -96,7 +115,8 @@ class LibP2PExtensionHandler:
             # In a full implementation, this would use proper ASN.1 encoding
             public_key_bytes = libp2p_public_key.serialize()
 
-            # Simple encoding: [public_key_length][public_key][signature_length][signature]
+            # Simple encoding:
+            # [public_key_length][public_key][signature_length][signature]
             extension_data = (
                 len(public_key_bytes).to_bytes(4, byteorder="big")
                 + public_key_bytes
@@ -112,7 +132,7 @@ class LibP2PExtensionHandler:
             ) from e
 
     @staticmethod
-    def parse_signed_key_extension(extension_data: bytes) -> Tuple[PublicKey, bytes]:
+    def parse_signed_key_extension(extension_data: bytes) -> tuple[PublicKey, bytes]:
         """
         Parse the libp2p Public Key Extension to extract public key and signature.
 
@@ -158,8 +178,6 @@ class LibP2PExtensionHandler:
 
             signature = extension_data[offset : offset + signature_length]
 
-            # Deserialize the public key
-            # This is a simplified approach - full implementation would handle all key types
             public_key = LibP2PKeyConverter.deserialize_public_key(public_key_bytes)
 
             return public_key, signature
@@ -199,21 +217,20 @@ class LibP2PKeyConverter:
     @staticmethod
     def deserialize_public_key(key_bytes: bytes) -> PublicKey:
         """
-        Deserialize libp2p public key from bytes.
+        Deserialize libp2p public key from protobuf bytes.
+
+        Args:
+            key_bytes: Protobuf-serialized public key bytes
+
+        Returns:
+            Deserialized PublicKey instance
 
-        This is a simplified implementation - full version would handle
-        all libp2p key types and proper deserialization.
         """
-        # For now, assume Ed25519 keys (most common in libp2p)
-        # Full implementation would detect key type from bytes
         try:
-            return Ed25519PublicKey.deserialize(key_bytes)
-        except Exception:
-            # Fallback to other key types
-            try:
-                return Secp256k1PublicKey.deserialize(key_bytes)
-            except Exception:
-                raise QUICCertificateError("Unsupported key type in extension")
+            # Use the official libp2p deserialization function
+            return deserialize_public_key(key_bytes)
+        except Exception as e:
+            raise QUICCertificateError(f"Failed to deserialize public key: {e}") from e
 
 
 class CertificateGenerator:
@@ -222,7 +239,7 @@ class CertificateGenerator:
     Follows libp2p TLS specification for QUIC transport.
     """
 
-    def __init__(self):
+    def __init__(self) -> None:
         self.extension_handler = LibP2PExtensionHandler()
         self.key_converter = LibP2PKeyConverter()
 
@@ -234,6 +251,7 @@ class CertificateGenerator:
     ) -> TLSConfig:
         """
         Generate a TLS certificate with embedded libp2p peer identity.
+        Fixed to use datetime objects for validity periods.
 
         Args:
             libp2p_private_key: The libp2p identity private key
@@ -265,24 +283,31 @@ class CertificateGenerator:
                 libp2p_private_key, cert_public_key_bytes
             )
 
-            # Set validity period
-            now = time.time()
-            not_before = time.gmtime(now - CERTIFICATE_NOT_BEFORE_BUFFER)
-            not_after = time.gmtime(now + (validity_days * 24 * 3600))
+            # Set validity period using datetime objects (FIXED)
+            now = datetime.utcnow()  # Use datetime instead of time.time()
+            not_before = now - timedelta(seconds=CERTIFICATE_NOT_BEFORE_BUFFER)
+            not_after = now + timedelta(days=validity_days)
 
-            # Build certificate
+            # Generate serial number
+            serial_number = int(now.timestamp())  # Convert datetime to timestamp
+
+            # Build certificate with proper datetime objects
             certificate = (
                 x509.CertificateBuilder()
                 .subject_name(
-                    x509.Name([x509.NameAttribute(NameOID.COMMON_NAME, str(peer_id))])
+                    x509.Name(
+                        [x509.NameAttribute(NameOID.COMMON_NAME, peer_id.to_base58())]  # type: ignore
+                    )
                 )
                 .issuer_name(
-                    x509.Name([x509.NameAttribute(NameOID.COMMON_NAME, str(peer_id))])
+                    x509.Name(
+                        [x509.NameAttribute(NameOID.COMMON_NAME, peer_id.to_base58())]  # type: ignore
+                    )
                 )
                 .public_key(cert_public_key)
-                .serial_number(int(now))  # Use timestamp as serial number
-                .not_valid_before(time.struct_time(not_before))
-                .not_valid_after(time.struct_time(not_after))
+                .serial_number(serial_number)
+                .not_valid_before(not_before)
+                .not_valid_after(not_after)
                 .add_extension(
                     x509.UnrecognizedExtension(
                         oid=LIBP2P_TLS_EXTENSION_OID, value=extension_data
@@ -293,6 +318,7 @@ class CertificateGenerator:
             )
 
             logger.info(f"Generated libp2p TLS certificate for peer {peer_id}")
+            logger.debug(f"Certificate valid from {not_before} to {not_after}")
 
             return TLSConfig(
                 certificate=certificate, private_key=cert_private_key, peer_id=peer_id
@@ -308,11 +334,11 @@ class PeerAuthenticator:
     Validates both TLS certificate integrity and libp2p peer identity.
     """
 
-    def __init__(self):
+    def __init__(self) -> None:
         self.extension_handler = LibP2PExtensionHandler()
 
     def verify_peer_certificate(
-        self, certificate: x509.Certificate, expected_peer_id: Optional[ID] = None
+        self, certificate: x509.Certificate, expected_peer_id: ID | None = None
     ) -> ID:
         """
         Verify a peer's TLS certificate and extract/validate peer identity.
@@ -366,7 +392,8 @@ class PeerAuthenticator:
             # Verify against expected peer ID if provided
             if expected_peer_id and derived_peer_id != expected_peer_id:
                 raise QUICPeerVerificationError(
-                    f"Peer ID mismatch: expected {expected_peer_id}, got {derived_peer_id}"
+                    f"Peer ID mismatch: expected {expected_peer_id}, "
+                    f"got {derived_peer_id}"
                 )
 
             logger.info(f"Successfully verified peer certificate for {derived_peer_id}")
@@ -397,38 +424,46 @@ class QUICTLSConfigManager:
             libp2p_private_key, peer_id
         )
 
-    def create_server_config(self) -> dict:
+    def create_server_config(
+        self,
+    ) -> TSecurityConfig:
         """
         Create aioquic server configuration with libp2p TLS settings.
+        Returns cryptography objects instead of DER bytes.
 
         Returns:
             Configuration dictionary for aioquic QuicConfiguration
 
         """
-        return {
-            "certificate": self.tls_config.get_certificate_der(),
-            "private_key": self.tls_config.get_private_key_der(),
-            "alpn_protocols": ["libp2p"],  # Required ALPN protocol
-            "verify_mode": True,  # Require client certificates
+        config: TSecurityConfig = {
+            "certificate": self.tls_config.certificate,
+            "private_key": self.tls_config.private_key,
+            "certificate_chain": [],
+            "alpn_protocols": ["libp2p"],
+            "verify_mode": True,
         }
+        return config
 
-    def create_client_config(self) -> dict:
+    def create_client_config(self) -> TSecurityConfig:
         """
         Create aioquic client configuration with libp2p TLS settings.
+        Returns cryptography objects instead of DER bytes.
 
         Returns:
             Configuration dictionary for aioquic QuicConfiguration
 
         """
-        return {
-            "certificate": self.tls_config.get_certificate_der(),
-            "private_key": self.tls_config.get_private_key_der(),
-            "alpn_protocols": ["libp2p"],  # Required ALPN protocol
-            "verify_mode": True,  # Verify server certificate
+        config: TSecurityConfig = {
+            "certificate": self.tls_config.certificate,
+            "private_key": self.tls_config.private_key,
+            "certificate_chain": [],
+            "alpn_protocols": ["libp2p"],
+            "verify_mode": True,
         }
+        return config
 
     def verify_peer_identity(
-        self, peer_certificate: x509.Certificate, expected_peer_id: Optional[ID] = None
+        self, peer_certificate: x509.Certificate, expected_peer_id: ID | None = None
     ) -> ID:
         """
         Verify remote peer's identity from their TLS certificate.
diff --git a/libp2p/transport/quic/transport.py b/libp2p/transport/quic/transport.py
index f65787e2..59d62715 100644
--- a/libp2p/transport/quic/transport.py
+++ b/libp2p/transport/quic/transport.py
@@ -5,6 +5,7 @@ Based on aioquic library with interface consistency to go-libp2p and js-libp2p.
 Updated to include Module 5 security integration.
 """
 
+from collections.abc import Iterable
 import copy
 import logging
 
@@ -16,7 +17,6 @@ from aioquic.quic.connection import (
 )
 import multiaddr
 import trio
-from typing_extensions import Unpack
 
 from libp2p.abc import (
     IRawConnection,
@@ -29,13 +29,13 @@ from libp2p.custom_types import THandler, TProtocol
 from libp2p.peer.id import (
     ID,
 )
-from libp2p.transport.quic.config import QUICTransportKwargs
+from libp2p.transport.quic.security import TSecurityConfig
 from libp2p.transport.quic.utils import (
+    get_alpn_protocols,
     is_quic_multiaddr,
     multiaddr_to_quic_version,
     quic_multiaddr_to_endpoint,
     quic_version_to_wire_format,
-    get_alpn_protocols,
 )
 
 from .config import (
@@ -111,7 +111,7 @@ class QUICTransport(ITransport):
         )
 
     def _setup_quic_configurations(self) -> None:
-        """Setup QUIC configurations for supported protocol versions with TLS security."""
+        """Setup QUIC configurations."""
         try:
             # Get TLS configuration from security manager
             server_tls_config = self._security_manager.create_server_config()
@@ -140,12 +140,12 @@ class QUICTransport(ITransport):
             self._apply_tls_configuration(base_client_config, client_tls_config)
 
             # QUIC v1 (RFC 9000) configurations
-            quic_v1_server_config = copy.deepcopy(base_server_config)
+            quic_v1_server_config = copy.copy(base_server_config)
             quic_v1_server_config.supported_versions = [
                 quic_version_to_wire_format(QUIC_V1_PROTOCOL)
             ]
 
-            quic_v1_client_config = copy.deepcopy(base_client_config)
+            quic_v1_client_config = copy.copy(base_client_config)
             quic_v1_client_config.supported_versions = [
                 quic_version_to_wire_format(QUIC_V1_PROTOCOL)
             ]
@@ -160,12 +160,12 @@ class QUICTransport(ITransport):
 
             # QUIC draft-29 configurations for compatibility
             if self._config.enable_draft29:
-                draft29_server_config = copy.deepcopy(base_server_config)
+                draft29_server_config: QuicConfiguration = copy.copy(base_server_config)
                 draft29_server_config.supported_versions = [
                     quic_version_to_wire_format(QUIC_DRAFT29_PROTOCOL)
                 ]
 
-                draft29_client_config = copy.deepcopy(base_client_config)
+                draft29_client_config = copy.copy(base_client_config)
                 draft29_client_config.supported_versions = [
                     quic_version_to_wire_format(QUIC_DRAFT29_PROTOCOL)
                 ]
@@ -185,10 +185,10 @@ class QUICTransport(ITransport):
             ) from e
 
     def _apply_tls_configuration(
-        self, config: QuicConfiguration, tls_config: dict
+        self, config: QuicConfiguration, tls_config: TSecurityConfig
     ) -> None:
         """
-        Apply TLS configuration to QuicConfiguration.
+        Apply TLS configuration to a QUIC configuration using aioquic's actual API.
 
         Args:
             config: QuicConfiguration to update
@@ -196,22 +196,54 @@ class QUICTransport(ITransport):
 
         """
         try:
-            # Set certificate and private key
+            # Set certificate and private key directly on the configuration
+            # aioquic expects cryptography objects, not DER bytes
             if "certificate" in tls_config and "private_key" in tls_config:
-                # aioquic expects certificate and private key in specific formats
-                # This is a simplified approach - full implementation would handle
-                # proper certificate chain setup
-                config.load_cert_chain_from_der(
-                    tls_config["certificate"], tls_config["private_key"]
-                )
+                # The security manager should return cryptography objects
+                # not DER bytes, but if it returns DER bytes, we need to handle that
+                certificate = tls_config["certificate"]
+                private_key = tls_config["private_key"]
+
+                # Check if we received DER bytes and need
+                # to convert to cryptography objects
+                if isinstance(certificate, bytes):
+                    from cryptography import x509
+
+                    certificate = x509.load_der_x509_certificate(certificate)
+
+                if isinstance(private_key, bytes):
+                    from cryptography.hazmat.primitives import serialization
+
+                    private_key = serialization.load_der_private_key(  # type: ignore
+                        private_key, password=None
+                    )
+
+                # Set directly on the configuration object
+                config.certificate = certificate
+                config.private_key = private_key
+
+                # Handle certificate chain if provided
+                certificate_chain = tls_config.get("certificate_chain", [])
+                if certificate_chain and isinstance(certificate_chain, Iterable):
+                    # Convert DER bytes to cryptography objects if needed
+                    chain_objects = []
+                    for cert in certificate_chain:
+                        if isinstance(cert, bytes):
+                            from cryptography import x509
+
+                            cert = x509.load_der_x509_certificate(cert)
+                        chain_objects.append(cert)
+                    config.certificate_chain = chain_objects
 
             # Set ALPN protocols
             if "alpn_protocols" in tls_config:
-                config.alpn_protocols = tls_config["alpn_protocols"]
+                config.alpn_protocols = tls_config["alpn_protocols"]  # type: ignore
 
-            # Set certificate verification
+            # Set certificate verification mode
             if "verify_mode" in tls_config:
-                config.verify_mode = tls_config["verify_mode"]
+                config.verify_mode = tls_config["verify_mode"]  # type: ignore
+
+            logger.debug("Successfully applied TLS configuration to QUIC config")
 
         except Exception as e:
             raise QUICSecurityError(f"Failed to apply TLS configuration: {e}") from e
@@ -301,6 +333,7 @@ class QUICTransport(ITransport):
 
         Raises:
             QUICSecurityError: If peer verification fails
+
         """
         try:
             # Get peer certificate from the connection
@@ -316,7 +349,8 @@ class QUICTransport(ITransport):
 
             if verified_peer_id != expected_peer_id:
                 raise QUICSecurityError(
-                    f"Peer ID verification failed: expected {expected_peer_id}, got {verified_peer_id}"
+                    "Peer ID verification failed: expected "
+                    f"{expected_peer_id}, got {verified_peer_id}"
                 )
 
             logger.info(f"Peer identity verified: {verified_peer_id}")
@@ -437,5 +471,6 @@ class QUICTransport(ITransport):
 
         Returns:
             The QUIC TLS configuration manager
+
         """
         return self._security_manager
diff --git a/libp2p/transport/quic/utils.py b/libp2p/transport/quic/utils.py
index 5bf119c9..c9db6fa9 100644
--- a/libp2p/transport/quic/utils.py
+++ b/libp2p/transport/quic/utils.py
@@ -184,7 +184,8 @@ def create_quic_multiaddr(
         if version == "quic-v1" or version == "/quic-v1":
             quic_proto = QUIC_V1_PROTOCOL
         elif version == "quic" or version == "/quic":
-            quic_proto = QUIC_DRAFT29_PROTOCOL
+            # This is DRAFT Protocol
+            quic_proto = QUIC_V1_PROTOCOL
         else:
             raise QUICInvalidMultiaddrError(f"Invalid QUIC version: {version}")
 
diff --git a/tests/core/transport/quic/test_connection.py b/tests/core/transport/quic/test_connection.py
index 80b4a5da..12e08138 100644
--- a/tests/core/transport/quic/test_connection.py
+++ b/tests/core/transport/quic/test_connection.py
@@ -36,8 +36,8 @@ class MockResourceScope:
         self.memory_reserved = max(0, self.memory_reserved - size)
 
 
-class TestQUICConnectionEnhanced:
-    """Enhanced test suite for QUIC connection functionality."""
+class TestQUICConnection:
+    """Test suite for QUIC connection functionality."""
 
     @pytest.fixture
     def mock_quic_connection(self):
@@ -58,10 +58,13 @@ class TestQUICConnectionEnhanced:
         return MockResourceScope()
 
     @pytest.fixture
-    def quic_connection(self, mock_quic_connection, mock_resource_scope):
+    def quic_connection(
+        self, mock_quic_connection: Mock, mock_resource_scope: MockResourceScope
+    ):
         """Create test QUIC connection with enhanced features."""
         private_key = create_new_key_pair().private_key
         peer_id = ID.from_pubkey(private_key.get_public_key())
+        mock_security_manager = Mock()
 
         return QUICConnection(
             quic_connection=mock_quic_connection,
@@ -72,6 +75,7 @@ class TestQUICConnectionEnhanced:
             maddr=Multiaddr("/ip4/127.0.0.1/udp/4001/quic"),
             transport=Mock(),
             resource_scope=mock_resource_scope,
+            security_manager=mock_security_manager,
         )
 
     @pytest.fixture
@@ -267,7 +271,9 @@ class TestQUICConnectionEnhanced:
             await quic_connection.start()
 
     @pytest.mark.trio
-    async def test_connection_connect_with_nursery(self, quic_connection):
+    async def test_connection_connect_with_nursery(
+        self, quic_connection: QUICConnection
+    ):
         """Test connection establishment with nursery."""
         quic_connection._started = True
         quic_connection._established = True
@@ -277,7 +283,9 @@ class TestQUICConnectionEnhanced:
             quic_connection, "_start_background_tasks", new_callable=AsyncMock
         ) as mock_start_tasks:
             with patch.object(
-                quic_connection, "verify_peer_identity", new_callable=AsyncMock
+                quic_connection,
+                "_verify_peer_identity_with_security",
+                new_callable=AsyncMock,
             ) as mock_verify:
                 async with trio.open_nursery() as nursery:
                     await quic_connection.connect(nursery)
diff --git a/tests/core/transport/quic/test_utils.py b/tests/core/transport/quic/test_utils.py
index 9300c5a7..acc96ade 100644
--- a/tests/core/transport/quic/test_utils.py
+++ b/tests/core/transport/quic/test_utils.py
@@ -66,7 +66,8 @@ Focused tests covering essential functionality required for QUIC transport.
 
 #         for addr_str in invalid_addrs:
 #             maddr = Multiaddr(addr_str)
-#             assert not is_quic_multiaddr(maddr), f"Should not detect {addr_str} as QUIC"
+#             assert not is_quic_multiaddr(maddr),
+#                 f"Should not detect {addr_str} as QUIC"
 
 #     def test_malformed_multiaddrs(self):
 #         """Test malformed multiaddrs don't crash."""