diff --git a/src/tls_front/fetcher.rs b/src/tls_front/fetcher.rs
index 39a4609..44504d8 100644
--- a/src/tls_front/fetcher.rs
+++ b/src/tls_front/fetcher.rs
@@ -1,19 +1,22 @@
 use std::sync::Arc;
 use std::time::Duration;
 
+use anyhow::Result;
 use tokio::net::TcpStream;
 use tokio::time::timeout;
 use tokio_rustls::client::TlsStream;
 use tokio_rustls::TlsConnector;
-use tracing::{debug, warn};
+use tracing::debug;
 
-use rustls::client::{ClientConfig, ServerCertVerifier, ServerName};
+use rustls::client::danger::{HandshakeSignatureValid, ServerCertVerified, ServerCertVerifier};
+use rustls::client::ClientConfig;
+use rustls::pki_types::{CertificateDer, ServerName, UnixTime};
 use rustls::{DigitallySignedStruct, Error as RustlsError};
-use rustls::pki_types::{ServerName as PkiServerName, UnixTime, CertificateDer};
 
 use crate::tls_front::types::{ParsedServerHello, TlsFetchResult};
 
 /// No-op verifier: accept any certificate (we only need lengths and metadata).
+#[derive(Debug)]
 struct NoVerify;
 
 impl ServerCertVerifier for NoVerify {
@@ -21,11 +24,11 @@ impl ServerCertVerifier for NoVerify {
         &self,
         _end_entity: &CertificateDer<'_>,
         _intermediates: &[CertificateDer<'_>],
-        _server_name: &PkiServerName<'_>,
+        _server_name: &ServerName<'_>,
         _ocsp: &[u8],
         _now: UnixTime,
-    ) -> Result<rustls::client::ServerCertVerified, RustlsError> {
-        Ok(rustls::client::ServerCertVerified::assertion())
+    ) -> Result<ServerCertVerified, RustlsError> {
+        Ok(ServerCertVerified::assertion())
     }
 
     fn verify_tls12_signature(
@@ -33,8 +36,8 @@ impl ServerCertVerifier for NoVerify {
         _message: &[u8],
         _cert: &CertificateDer<'_>,
         _dss: &DigitallySignedStruct,
-    ) -> Result<rustls::client::HandshakeSignatureValid, RustlsError> {
-        Ok(rustls::client::HandshakeSignatureValid::assertion())
+    ) -> Result<HandshakeSignatureValid, RustlsError> {
+        Ok(HandshakeSignatureValid::assertion())
     }
 
     fn verify_tls13_signature(
@@ -42,57 +45,67 @@ impl ServerCertVerifier for NoVerify {
         _message: &[u8],
         _cert: &CertificateDer<'_>,
         _dss: &DigitallySignedStruct,
-    ) -> Result<rustls::client::HandshakeSignatureValid, RustlsError> {
-        Ok(rustls::client::HandshakeSignatureValid::assertion())
+    ) -> Result<HandshakeSignatureValid, RustlsError> {
+        Ok(HandshakeSignatureValid::assertion())
+    }
+
+    fn supported_verify_schemes(&self) -> Vec<rustls::SignatureScheme> {
+        use rustls::SignatureScheme::*;
+        vec![
+            RSA_PKCS1_SHA256,
+            RSA_PSS_SHA256,
+            ECDSA_NISTP256_SHA256,
+            ECDSA_NISTP384_SHA384,
+        ]
     }
 }
 
 fn build_client_config() -> Arc<ClientConfig> {
-    let mut root = rustls::RootCertStore::empty();
-    // Optionally load system roots; failure is non-fatal.
-    let _ = root.add_server_trust_anchors(webpki_roots::TLS_SERVER_ROOTS.iter().cloned());
+    let root = rustls::RootCertStore::empty();
 
-    Arc::new(
-        ClientConfig::builder()
-            .with_safe_default_cipher_suites()
-            .with_safe_default_kx_groups()
-            .with_protocol_versions(&[&rustls::version::TLS13, &rustls::version::TLS12])
-            .unwrap()
-            .with_custom_certificate_verifier(Arc::new(NoVerify))
-            .with_root_certificates(root)
-            .with_no_client_auth(),
-    )
+    let provider = rustls::crypto::ring::default_provider();
+    let mut config = ClientConfig::builder_with_provider(Arc::new(provider))
+        .with_protocol_versions(&[&rustls::version::TLS13, &rustls::version::TLS12])
+        .expect("protocol versions")
+        .with_root_certificates(root)
+        .with_no_client_auth();
+
+    config
+        .dangerous()
+        .set_certificate_verifier(Arc::new(NoVerify));
+
+    Arc::new(config)
 }
 
-/// Try to fetch real TLS metadata for the given SNI.
+/// Fetch real TLS metadata for the given SNI: negotiated cipher and cert lengths.
 pub async fn fetch_real_tls(
     host: &str,
     port: u16,
     sni: &str,
     connect_timeout: Duration,
-) -> anyhow::Result<TlsFetchResult> {
-    let addr = format!("{}:{}", host, port);
+) -> Result<TlsFetchResult> {
+    let addr = format!("{host}:{port}");
     let stream = timeout(connect_timeout, TcpStream::connect(addr)).await??;
 
     let config = build_client_config();
     let connector = TlsConnector::from(config);
 
-    let server_name = ServerName::try_from(sni)
-        .or_else(|_| ServerName::try_from(host))
+    let server_name = ServerName::try_from(sni.to_owned())
+        .or_else(|_| ServerName::try_from(host.to_owned()))
         .map_err(|_| RustlsError::General("invalid SNI".into()))?;
 
-    let mut tls_stream: TlsStream<TcpStream> = connector.connect(server_name, stream).await?;
+    let tls_stream: TlsStream<TcpStream> = connector.connect(server_name, stream).await?;
 
     // Extract negotiated parameters and certificates
-    let (session, _io) = tls_stream.get_ref();
+    let (_io, session) = tls_stream.get_ref();
     let cipher_suite = session
         .negotiated_cipher_suite()
-        .map(|s| s.suite().get_u16().to_be_bytes())
+        .map(|s| u16::from(s.suite()).to_be_bytes())
         .unwrap_or([0x13, 0x01]);
 
     let certs: Vec<CertificateDer<'static>> = session
         .peer_certificates()
-        .map(|slice| slice.iter().cloned().collect())
+        .map(|slice| slice.to_vec())
         .unwrap_or_default();
 
     let total_cert_len: usize = certs.iter().map(|c| c.len()).sum::<usize>().max(1024);
diff --git a/src/transport/socket.rs b/src/transport/socket.rs
index 7113afc..f353c52 100644
--- a/src/transport/socket.rs
+++ b/src/transport/socket.rs
@@ -138,7 +138,7 @@ pub fn resolve_interface_ip(name: &str, want_ipv6: bool) -> Option<IpAddr> {
                         }
                     } else if let Some(v6) = address.as_sockaddr_in6() {
                         if want_ipv6 {
-                            return Some(IpAddr::V6(v6.ip().to_std()));
+                            return Some(IpAddr::V6(v6.ip().clone()));
                         }
                     }
                 }
diff --git a/src/transport/upstream.rs b/src/transport/upstream.rs
index 28319d3..660043f 100644
--- a/src/transport/upstream.rs
+++ b/src/transport/upstream.rs
@@ -609,7 +609,7 @@ impl UpstreamManager {
                             }
                             let result = tokio::time::timeout(
                                 Duration::from_secs(DC_PING_TIMEOUT_SECS),
-                                self.ping_single_dc(&upstream_config, addr)
+                                self.ping_single_dc(&upstream_config, Some(bind_rr.clone()), addr)
                             ).await;
 
                             let ping_result = match result {