diff --git a/README.md b/README.md
index f457af4..d6c2aa0 100644
--- a/README.md
+++ b/README.md
@@ -11,8 +11,6 @@ A HTTP proxy server library intended to be a backend of application like Burp pr
 ## Usage
 
 ```rust, no_run
-use std::sync::Arc;
-
 use futures::StreamExt;
 use http_mitm_proxy::MitmProxy;
 
@@ -34,11 +32,12 @@ fn make_root_cert() -> rcgen::Certificate {
 
 #[tokio::main]
 async fn main() {
-    let root_cert = Arc::new(make_root_cert());
+    let root_cert = make_root_cert();
+    let root_cert_pem = root_cert.serialize_pem().unwrap();
 
     let proxy = MitmProxy::new(
         // This is the root cert that will be used to sign the fake certificates
-        Some(root_cert.clone()),
+        Some(root_cert),
         // This is the connector that will be used to connect to the upstream server from proxy
         tokio_native_tls::native_tls::TlsConnector::new().unwrap(),
     );
@@ -51,7 +50,7 @@ async fn main() {
     println!();
     println!("Trust this cert if you want to use HTTPS");
     println!();
-    println!("{}", root_cert.serialize_pem().unwrap());
+    println!("{}", root_cert_pem);
     println!();
 
     /*
diff --git a/examples/proxy.rs b/examples/proxy.rs
index ffac2e5..dfad4a7 100644
--- a/examples/proxy.rs
+++ b/examples/proxy.rs
@@ -1,5 +1,3 @@
-use std::sync::Arc;
-
 use futures::StreamExt;
 use http_mitm_proxy::MitmProxy;
 
@@ -21,11 +19,12 @@ fn make_root_cert() -> rcgen::Certificate {
 
 #[tokio::main]
 async fn main() {
-    let root_cert = Arc::new(make_root_cert());
+    let root_cert = make_root_cert();
+    let root_cert_pem = root_cert.serialize_pem().unwrap();
 
     let proxy = MitmProxy::new(
         // This is the root cert that will be used to sign the fake certificates
-        Some(root_cert.clone()),
+        Some(root_cert),
         // This is the connector that will be used to connect to the upstream server from proxy
         tokio_native_tls::native_tls::TlsConnector::new().unwrap(),
     );
@@ -38,7 +37,7 @@ async fn main() {
     println!();
     println!("Trust this cert if you want to use HTTPS");
     println!();
-    println!("{}", root_cert.serialize_pem().unwrap());
+    println!("{}", root_cert_pem);
     println!();
 
     /*
diff --git a/src/lib.rs b/src/lib.rs
index ae28aa7..35c247d 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -14,7 +14,7 @@ use hyper::{
     Method, Request, Response, StatusCode, Uri,
 };
 use hyper_util::rt::TokioIo;
-use std::{future::Future, ops::Deref, sync::Arc};
+use std::{borrow::Borrow, future::Future, sync::Arc};
 use tls::server_config;
 use tokio::{
     io::{AsyncReadExt, AsyncWriteExt},
@@ -83,7 +83,7 @@ pub struct Communication<B> {
 }
 
 /// C is typically Arc<Certificate> or &'static Certificate
-impl<C: Deref<Target = rcgen::Certificate> + Send + Sync + 'static> MitmProxy<C> {
+impl<C: Borrow<rcgen::Certificate> + Send + Sync + 'static> MitmProxy<C> {
     /// Bind proxy server to address.
     /// You can observe communications between client and server by receiving stream.
     /// To run proxy server, you need to run returned future. This API design give you an ability to cancel proxy server when you want.
@@ -183,7 +183,7 @@ impl<C: Deref<Target = rcgen::Certificate> + Send + Sync + 'static> MitmProxy<C>
                 };
 
                 if let Some(root_cert) = proxy.root_cert.as_ref() {
-                    let Ok(server_config) = server_config(host.to_string(), root_cert.deref())
+                    let Ok(server_config) = server_config(host.to_string(), root_cert.borrow())
                     else {
                         tracing::error!("Failed to create server config for {}", host);
                         return;
diff --git a/tests/test.rs b/tests/test.rs
index a790916..f37bb8b 100644
--- a/tests/test.rs
+++ b/tests/test.rs
@@ -150,14 +150,11 @@ where
 
     tokio::spawn(server);
 
-    let root_cert = Arc::new(root_cert());
+    let root_cert = root_cert();
+    let root_cert_der = root_cert.serialize_der().unwrap();
 
     let proxy = http_mitm_proxy::MitmProxy::new(
-        if without_cert {
-            None
-        } else {
-            Some(root_cert.clone())
-        },
+        if without_cert { None } else { Some(root_cert) },
         tokio_native_tls::native_tls::TlsConnector::builder()
             .danger_accept_invalid_certs(true)
             .danger_accept_invalid_hostnames(true)
@@ -176,9 +173,7 @@ where
 
     let client = if !without_cert {
         client_builder
-            .add_root_certificate(
-                reqwest::Certificate::from_der(&root_cert.serialize_der().unwrap()).unwrap(),
-            )
+            .add_root_certificate(reqwest::Certificate::from_der(&root_cert_der).unwrap())
             .build()
             .unwrap()
     } else {