diff --git a/proto b/proto
index 9305cdc..c2ff3f0 160000
--- a/proto
+++ b/proto
@@ -1 +1 @@
-Subproject commit 9305cdcaeee44337a269db3336193127e38f9e21
+Subproject commit c2ff3f0a1e6cc12320c9353197c3bbba7de50185
diff --git a/src/error.rs b/src/error.rs
index 2f7e1d2..8624420 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -25,6 +25,8 @@ pub enum WorkerError {
     IO,
     #[error("UTF8 conversion failed")]
     UTF8Conversion,
+    #[error("Cannot find key serial number")]
+    SerialNotFound,
 }
 
 impl From<tonic::transport::Error> for WorkerError {
diff --git a/src/gpg.rs b/src/gpg.rs
index 9c19a33..35e58ff 100644
--- a/src/gpg.rs
+++ b/src/gpg.rs
@@ -223,7 +223,8 @@ pub fn factory_reset_key() -> Result<(), WorkerError> {
     }
 }
 
-pub fn check_card() -> Result<(), WorkerError> {
+// returns serial number of yubikey if detected
+pub fn check_card() -> Result<String, WorkerError> {
     let out = Command::new("ykman")
         .args(["list"])
         .output()
@@ -245,9 +246,20 @@ pub fn check_card() -> Result<(), WorkerError> {
     if keys_found != 1 {
         return Err(WorkerError::MultipleKeysPresent);
     }
-    Ok(())
+    let out_split: Vec<&str> = out_str.split_whitespace().collect();
+    for (i, &item) in out_split.iter().enumerate() {
+        if item == "Serial:" {
+            if let Some(serial) = out_split.get(i + 1) {
+                return Ok(serial.to_string());
+            } else {
+                return Err(WorkerError::SerialNotFound);
+            }
+        }
+    }
+    Err(WorkerError::SerialNotFound)
 }
 
+#[allow(dead_code)]
 pub fn get_fingerprint() -> Result<String, WorkerError> {
     let out = Command::new("gpg")
         .args(["--list-keys"])
@@ -274,7 +286,7 @@ pub fn get_fingerprint() -> Result<String, WorkerError> {
 pub struct ProvisioningInfo {
     pub pgp: String,
     pub ssh: String,
-    pub fingerprint: String,
+    pub serial: String,
 }
 
 pub async fn provision_key(
@@ -287,10 +299,14 @@ pub async fn provision_key(
     let check_duration = Duration::from_secs(config.smartcard_retry_interval);
     let mut check_interval = interval(check_duration);
     let mut fail_counter = 0;
+    let serial: String;
     loop {
         check_interval.tick().await;
         match check_card() {
-            Ok(_) => break,
+            Ok(res) => {
+                serial = res;
+                break;
+            }
             Err(e) => match e {
                 WorkerError::NoKeysFound => {
                     info!(
@@ -306,7 +322,7 @@ pub async fn provision_key(
             },
         }
     }
-    debug!("Key found");
+    debug!("Key with serial ({serial}) found");
     let (gpg_home, mut gpg_process) = init_gpg()?;
     debug!("Temporary GPG session crated");
     debug!("Resetting card to factory");
@@ -320,7 +336,6 @@ pub async fn provision_key(
         &job.email,
     )?;
     debug!("OpenPGP key for {} created", &job.email);
-    let fingerprint = get_fingerprint()?;
     let pgp = export_public(gpg_command, &gpg_home, &job.email)?;
     let ssh = export_ssh(gpg_command, &gpg_home, &job.email)?;
     key_to_card(gpg_command, &config.gpg_debug_level, &gpg_home, &job.email)?;
@@ -336,9 +351,5 @@ pub async fn provision_key(
     }
     debug!("Temp home cleared");
     info!("Yubikey openpgp provisioning completed.");
-    Ok(ProvisioningInfo {
-        pgp,
-        ssh,
-        fingerprint,
-    })
+    Ok(ProvisioningInfo { pgp, ssh, serial })
 }
diff --git a/src/main.rs b/src/main.rs
index 04515c0..d34b6ab 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -110,7 +110,7 @@ async fn main() -> Result<(), WorkerError> {
                         success: true,
                         public_key: key_info.pgp,
                         ssh_key: key_info.ssh,
-                        fingerprint: key_info.fingerprint,
+                        yubikey_serial: key_info.serial,
                         error: "".into(),
                     };
                     let request = tonic::Request::new(job_status);
@@ -124,7 +124,7 @@ async fn main() -> Result<(), WorkerError> {
                         success: false,
                         public_key: "".into(),
                         ssh_key: "".into(),
-                        fingerprint: "".into(),
+                        yubikey_serial: "".into(),
                         error: err.to_string(),
                     };
                     let request = tonic::Request::new(job_status);