diff --git a/examples/authz/authenticator.rs b/examples/authz/authenticator.rs
index 9147c92..284b782 100644
--- a/examples/authz/authenticator.rs
+++ b/examples/authz/authenticator.rs
@@ -18,8 +18,9 @@ struct Cli {
     /// Pubky Auth url
     url: Url,
 
-    // Whether or not to use testnet Dht network (local testing)
-    testnet: Option<bool>,
+    /// Use testnet mode
+    #[clap(long)]
+    testnet: bool,
 }
 
 #[tokio::main]
@@ -65,7 +66,8 @@ async fn main() -> Result<()> {
     println!("Successfully decrypted recovery file...");
     println!("PublicKey: {}", keypair.public_key());
 
-    let client = if cli.testnet.unwrap_or_default() {
+    let client = if cli.testnet {
+        dbg!("HERE");
         let client = Client::builder().testnet().build()?;
 
         // For the purposes of this demo, we need to make sure
diff --git a/pubky/src/native.rs b/pubky/src/native.rs
index 6826b8c..891aa45 100644
--- a/pubky/src/native.rs
+++ b/pubky/src/native.rs
@@ -43,8 +43,16 @@ impl ClientBuilder {
     /// 2. Pkarr Relay running on port [15411][pubky_common::constants::testnet_ports::PKARR_RELAY]
     pub fn testnet(&mut self) -> &mut Self {
         self.pkarr
-            .bootstrap(&["localhost:6881"])
-            .relays(&["http://localhost:5411"])
+            .bootstrap(&[format!(
+                "localhost:{}",
+                // TODO: update constants
+                // pubky_common::constants::testnet_ports::BOOTSTRAP
+                6881
+            )])
+            .relays(&[format!(
+                "http://localhost:{}",
+                pubky_common::constants::testnet_ports::PKARR_RELAY
+            )])
             .expect("relays urls infallible");
 
         self