diff --git a/card-functionality/src/import.rs b/card-functionality/src/import.rs
index 42bb2d4..da2346e 100644
--- a/card-functionality/src/import.rs
+++ b/card-functionality/src/import.rs
@@ -29,7 +29,7 @@ fn main() -> Result<()> {
 
         print!("Set user data");
         let userdata_out = run_test(&mut card, test_set_user_data, &[])?;
-        println!(" {:x?}", userdata_out);
+        println!(" {userdata_out:x?}");
 
         let key_files = {
             let config = card.get_config();
@@ -42,20 +42,20 @@ fn main() -> Result<()> {
 
         for key_file in &key_files {
             // upload keys
-            print!("Upload key '{}'", key_file);
+            print!("Upload key '{key_file}'");
             let upload_res = run_test(&mut card, test_upload_keys, &[key_file]);
 
             if let Err(TestError::KeyUploadError(_file, err)) = &upload_res {
                 // The card doesn't support this key type, so skip to the
                 // next key - don't try to decrypt/sign for this key.
 
-                println!(" => Upload failed ({:?}), skip tests", err);
+                println!(" => Upload failed ({err:?}), skip tests");
 
                 continue;
             }
 
             let upload_out = upload_res?;
-            println!(" {:x?}", upload_out);
+            println!(" {upload_out:x?}");
 
             let key = std::fs::read_to_string(key_file).expect("Unable to read ciphertext");
 
@@ -66,13 +66,13 @@ fn main() -> Result<()> {
             let ciphertext = util::encrypt_to("Hello world!\n", &c)?;
 
             let dec_out = run_test(&mut card, test_decrypt, &[&key, &ciphertext])?;
-            println!(" {:x?}", dec_out);
+            println!(" {dec_out:x?}");
 
             // sign
             print!("  Sign");
 
             let sign_out = run_test(&mut card, test_sign, &[&key])?;
-            println!(" {:x?}", sign_out);
+            println!(" {sign_out:x?}");
         }
 
         // FIXME: import key with password
diff --git a/card-functionality/src/keygen.rs b/card-functionality/src/keygen.rs
index a561488..2cce5b5 100644
--- a/card-functionality/src/keygen.rs
+++ b/card-functionality/src/keygen.rs
@@ -53,7 +53,7 @@ fn main() -> Result<()> {
         };
 
         for algo in algos {
-            println!("Generate key [{}]", algo);
+            println!("Generate key [{algo}]");
 
             let res = run_test(&mut card, test_keygen, &[&algo])?;
 
@@ -61,7 +61,7 @@ fn main() -> Result<()> {
                 // sign
                 print!("  Sign");
                 let sign_out = run_test(&mut card, test_sign, &[cert])?;
-                println!(" {:x?}", sign_out);
+                println!(" {sign_out:x?}");
 
                 // decrypt
                 let c = Cert::from_str(cert)?;
@@ -69,7 +69,7 @@ fn main() -> Result<()> {
 
                 print!("  Decrypt");
                 let dec_out = run_test(&mut card, test_decrypt, &[cert, &ciphertext])?;
-                println!(" {:x?}", dec_out);
+                println!(" {dec_out:x?}");
             } else {
                 panic!("Didn't get back a Cert from test_keygen");
             };
diff --git a/card-functionality/src/tests.rs b/card-functionality/src/tests.rs
index 236c9a1..ca9f53b 100644
--- a/card-functionality/src/tests.rs
+++ b/card-functionality/src/tests.rs
@@ -114,15 +114,15 @@ fn check_key_upload_metadata(
     let card_fp = ard.fingerprints()?;
 
     let sig = card_fp.signature().expect("signature fingerprint");
-    assert_eq!(format!("{:X}", sig), meta[0].0);
+    assert_eq!(format!("{sig:X}"), meta[0].0);
 
     let dec = card_fp.decryption().expect("decryption fingerprint");
-    assert_eq!(format!("{:X}", dec), meta[1].0);
+    assert_eq!(format!("{dec:X}"), meta[1].0);
 
     let auth = card_fp
         .authentication()
         .expect("authentication fingerprint");
-    assert_eq!(format!("{:X}", auth), meta[2].0);
+    assert_eq!(format!("{auth:X}"), meta[2].0);
 
     // get_key_generation_times
     let card_kg = ard.key_generation_times()?;
@@ -154,16 +154,16 @@ pub fn test_print_caps(pgp: &mut OpenPgp, _param: &[&str]) -> Result<TestOutput,
     let ard = pgpt.application_related_data()?;
 
     let aid = ard.application_id()?;
-    println!("aid: {:#x?}", aid);
+    println!("aid: {aid:#x?}");
 
     let hist = ard.historical_bytes()?;
-    println!("hist: {:#?}", hist);
+    println!("hist: {hist:#?}");
 
     let ecap = ard.extended_capabilities()?;
-    println!("ecap: {:#?}", ecap);
+    println!("ecap: {ecap:#?}");
 
     let eli = ard.extended_length_information()?;
-    println!("eli: {:#?}", eli);
+    println!("eli: {eli:#?}");
 
     Ok(vec![])
 }
@@ -174,13 +174,13 @@ pub fn test_print_algo_info(pgp: &mut OpenPgp, _param: &[&str]) -> Result<TestOu
     let ard = pgpt.application_related_data()?;
 
     let dec = ard.algorithm_attributes(KeyType::Decryption)?;
-    println!("Current algorithm for the decrypt slot: {}", dec);
+    println!("Current algorithm for the decrypt slot: {dec}");
 
     println!();
 
     let algo = pgpt.algorithm_information();
     if let Ok(Some(algo)) = algo {
-        println!("Card algorithm list:\n{}", algo);
+        println!("Card algorithm list:\n{algo}");
     }
 
     Ok(vec![])
@@ -276,7 +276,7 @@ pub fn test_get_pub(pgp: &mut OpenPgp, _param: &[&str]) -> Result<TestOutput, Te
     let key =
         public_key_material_and_fp_to_key(&sig, KeyType::Signing, &ts, fps.signature().unwrap())?;
 
-    println!(" sig key data from card -> {:x?}", key);
+    println!(" sig key data from card -> {key:x?}");
 
     // --
 
@@ -289,7 +289,7 @@ pub fn test_get_pub(pgp: &mut OpenPgp, _param: &[&str]) -> Result<TestOutput, Te
         fps.decryption().unwrap(),
     )?;
 
-    println!(" dec key data from card -> {:x?}", key);
+    println!(" dec key data from card -> {key:x?}");
 
     // --
 
@@ -302,7 +302,7 @@ pub fn test_get_pub(pgp: &mut OpenPgp, _param: &[&str]) -> Result<TestOutput, Te
         fps.authentication().unwrap(),
     )?;
 
-    println!(" auth key data from card -> {:x?}", key);
+    println!(" auth key data from card -> {key:x?}");
 
     Ok(vec![])
 }
@@ -360,7 +360,7 @@ pub fn test_private_data(pgp: &mut OpenPgp, _param: &[&str]) -> Result<TestOutpu
     println!();
 
     let d = pgpt.private_use_do(1)?;
-    println!("data 1 {:?}", d);
+    println!("data 1 {d:?}");
 
     pgpt.verify_pw1_user(b"123456")?;
 
@@ -373,13 +373,13 @@ pub fn test_private_data(pgp: &mut OpenPgp, _param: &[&str]) -> Result<TestOutpu
     pgpt.set_private_use_do(4, "Foo bar4!".as_bytes().to_vec())?;
 
     let d = pgpt.private_use_do(1)?;
-    println!("data 1 {:?}", d);
+    println!("data 1 {d:?}");
     let d = pgpt.private_use_do(2)?;
-    println!("data 2 {:?}", d);
+    println!("data 2 {d:?}");
     let d = pgpt.private_use_do(3)?;
-    println!("data 3 {:?}", d);
+    println!("data 3 {d:?}");
     let d = pgpt.private_use_do(4)?;
-    println!("data 4 {:?}", d);
+    println!("data 4 {d:?}");
 
     Ok(out)
 }
@@ -452,7 +452,7 @@ pub fn test_pw_status(pgp: &mut OpenPgp, _param: &[&str]) -> Result<TestOutput,
     let ard = pgpt.application_related_data()?;
     let mut pws = ard.pw_status_bytes()?;
 
-    println!("pws {:?}", pws);
+    println!("pws {pws:?}");
 
     pgpt.verify_pw3(b"12345678")?;
 
@@ -463,7 +463,7 @@ pub fn test_pw_status(pgp: &mut OpenPgp, _param: &[&str]) -> Result<TestOutput,
 
     let ard = pgpt.application_related_data()?;
     let pws = ard.pw_status_bytes()?;
-    println!("pws {:?}", pws);
+    println!("pws {pws:?}");
 
     Ok(out)
 }
diff --git a/openpgp-card-sequoia/examples/test.rs b/openpgp-card-sequoia/examples/test.rs
index 5cf47fa..e87b8ba 100644
--- a/openpgp-card-sequoia/examples/test.rs
+++ b/openpgp-card-sequoia/examples/test.rs
@@ -41,41 +41,41 @@ fn main() -> Result<(), Box<dyn Error>> {
         // card metadata
 
         let app_id = transaction.application_identifier()?;
-        println!("{:x?}\n", app_id);
+        println!("{app_id:x?}\n");
 
         let eli = transaction.extended_length_information()?;
-        println!("extended_length_info: {:?}\n", eli);
+        println!("extended_length_info: {eli:?}\n");
 
         let hist = transaction.historical_bytes()?;
-        println!("{:#x?}\n", hist);
+        println!("{hist:#x?}\n");
 
         let ext = transaction.extended_capabilities()?;
-        println!("{:#x?}\n", ext);
+        println!("{ext:#x?}\n");
 
         let pws = transaction.pw_status_bytes()?;
-        println!("{:#x?}\n", pws);
+        println!("{pws:#x?}\n");
 
         // cardholder
         let ch = transaction.cardholder_related_data()?;
-        println!("{:#x?}\n", ch);
+        println!("{ch:#x?}\n");
 
         // crypto-ish metadata
         let fp = transaction.fingerprints()?;
-        println!("Fingerprint {:#x?}\n", fp);
+        println!("Fingerprint {fp:#x?}\n");
 
         match transaction.algorithm_information() {
-            Ok(Some(ai)) => println!("Algorithm information:\n{}", ai),
+            Ok(Some(ai)) => println!("Algorithm information:\n{ai}"),
             Ok(None) => println!("No Algorithm information found"),
-            Err(e) => println!("Error getting Algorithm information: {:?}", e),
+            Err(e) => println!("Error getting Algorithm information: {e:?}"),
         }
 
         println!("Current algorithm attributes on card:");
         let algo = transaction.algorithm_attributes(KeyType::Signing)?;
-        println!("Sig: {}", algo);
+        println!("Sig: {algo}");
         let algo = transaction.algorithm_attributes(KeyType::Decryption)?;
-        println!("Dec: {}", algo);
+        println!("Dec: {algo}");
         let algo = transaction.algorithm_attributes(KeyType::Authentication)?;
-        println!("Aut: {}", algo);
+        println!("Aut: {algo}");
 
         println!();
 
@@ -87,7 +87,7 @@ fn main() -> Result<(), Box<dyn Error>> {
         assert_eq!(app_id.ident(), test_card_ident.to_ascii_uppercase());
 
         let check = transaction.check_admin_verified();
-        println!("has admin (pw3) been verified yet?\n{:x?}\n", check);
+        println!("has admin (pw3) been verified yet?\n{check:x?}\n");
 
         println!("factory reset\n");
         transaction.factory_reset()?;
@@ -96,7 +96,7 @@ fn main() -> Result<(), Box<dyn Error>> {
         println!("verify for admin ok");
 
         let check = transaction.check_user_verified();
-        println!("has user (pw1/82) been verified yet? {:x?}", check);
+        println!("has user (pw1/82) been verified yet? {check:x?}");
 
         // Use Admin access to card
         let mut admin = transaction.admin_card().expect("just verified");
@@ -148,13 +148,13 @@ fn main() -> Result<(), Box<dyn Error>> {
         assert_eq!(app_id.ident(), test_card_ident.to_ascii_uppercase());
 
         let check = transaction.check_user_verified();
-        println!("has user (pw1/82) been verified yet?\n{:x?}\n", check);
+        println!("has user (pw1/82) been verified yet?\n{check:x?}\n");
 
         transaction.verify_user(b"123456")?;
         println!("verify for user (pw1/82) ok");
 
         let check = transaction.check_user_verified();
-        println!("has user (pw1/82) been verified yet?\n{:x?}\n", check);
+        println!("has user (pw1/82) been verified yet?\n{check:x?}\n");
 
         // Use User access to card
         let mut user = transaction
@@ -164,14 +164,14 @@ fn main() -> Result<(), Box<dyn Error>> {
         let _cert = Cert::from_file(TEST_KEY_PATH)?;
         let msg = std::fs::read_to_string(TEST_ENC_MSG).expect("Unable to read file");
 
-        println!("Encrypted message:\n{}", msg);
+        println!("Encrypted message:\n{msg}");
 
         let sp = StandardPolicy::new();
         let d = user.decryptor(&|| println!("Touch confirmation needed for decryption"))?;
         let res = sq_util::decryption_helper(d, msg.into_bytes(), &sp)?;
 
         let plain = String::from_utf8_lossy(&res);
-        println!("Decrypted plaintext: {}", plain);
+        println!("Decrypted plaintext: {plain}");
 
         assert_eq!(plain, "Hello world!\n");
 
@@ -197,7 +197,7 @@ fn main() -> Result<(), Box<dyn Error>> {
         let signer = sign.signer(&|| {})?;
         let sig = sq_util::sign_helper(signer, &mut text.as_bytes())?;
 
-        println!("Signature from card:\n{}", sig)
+        println!("Signature from card:\n{sig}")
 
         // FIXME: validate sig
     } else {
diff --git a/openpgp-card-sequoia/src/privkey.rs b/openpgp-card-sequoia/src/privkey.rs
index 6c9337b..c537609 100644
--- a/openpgp-card-sequoia/src/privkey.rs
+++ b/openpgp-card-sequoia/src/privkey.rs
@@ -53,7 +53,7 @@ impl CardUploadableKey for SequoiaKey {
                 .key
                 .clone()
                 .decrypt_secret(&sequoia_openpgp::crypto::Password::from(pw.as_str()))
-                .map_err(|e| Error::InternalError(format!("sequoia decrypt failed {:?}", e)))?,
+                .map_err(|e| Error::InternalError(format!("sequoia decrypt failed {e:?}")))?,
         };
 
         // Get private cryptographic material
@@ -129,7 +129,7 @@ impl SqRSA {
         q: ProtectedMPI,
     ) -> Result<Self, Error> {
         let nettle = nettle::rsa::PrivateKey::new(d.value(), p.value(), q.value(), None)
-            .map_err(|e| Error::InternalError(format!("nettle error {:?}", e)))?;
+            .map_err(|e| Error::InternalError(format!("nettle error {e:?}")))?;
 
         Ok(Self { e, n, p, q, nettle })
     }
diff --git a/openpgp-card-sequoia/src/util.rs b/openpgp-card-sequoia/src/util.rs
index a4ba462..5583187 100644
--- a/openpgp-card-sequoia/src/util.rs
+++ b/openpgp-card-sequoia/src/util.rs
@@ -37,8 +37,8 @@ use crate::{Card, PublicKey};
 ///
 /// FIXME: accept optional metadata for user_id(s)?
 #[allow(clippy::too_many_arguments)]
-pub fn make_cert<'app>(
-    open: &mut Card<Transaction<'app>>,
+pub fn make_cert(
+    open: &mut Card<Transaction<'_>>,
     key_sig: PublicKey,
     key_dec: Option<PublicKey>,
     key_aut: Option<PublicKey>,
@@ -230,7 +230,7 @@ pub fn public_key_material_to_key(
     match pkm {
         PublicKeyMaterial::R(rsa) => {
             let k4 = Key4::import_public_rsa(rsa.v(), rsa.n(), Some(time)).map_err(|e| {
-                Error::InternalError(format!("sequoia Key4::import_public_rsa failed: {:?}", e))
+                Error::InternalError(format!("sequoia Key4::import_public_rsa failed: {e:?}"))
             })?;
 
             Ok(k4.into())
@@ -254,8 +254,7 @@ pub fn public_key_material_to_key(
                             let k4 =
                                 Key4::import_public_ed25519(ecc.data(), time).map_err(|e| {
                                     Error::InternalError(format!(
-                                        "sequoia Key4::import_public_ed25519 failed: {:?}",
-                                        e
+                                        "sequoia Key4::import_public_ed25519 failed: {e:?}"
                                     ))
                                 })?;
 
@@ -272,8 +271,7 @@ pub fn public_key_material_to_key(
                             )
                             .map_err(|e| {
                                 Error::InternalError(format!(
-                                    "sequoia Key4::new for ECDSA failed: {:?}",
-                                    e
+                                    "sequoia Key4::new for ECDSA failed: {e:?}"
                                 ))
                             })?;
 
@@ -286,8 +284,7 @@ pub fn public_key_material_to_key(
                             let k4 = Key4::import_public_cv25519(ecc.data(), hash, sym, time)
                                 .map_err(|e| {
                                     Error::InternalError(format!(
-                                        "sequoia Key4::import_public_cv25519 failed: {:?}",
-                                        e
+                                        "sequoia Key4::import_public_cv25519 failed: {e:?}"
                                     ))
                                 })?;
 
@@ -306,8 +303,7 @@ pub fn public_key_material_to_key(
                             )
                             .map_err(|e| {
                                 Error::InternalError(format!(
-                                    "sequoia Key4::new for ECDH failed: {:?}",
-                                    e
+                                    "sequoia Key4::new for ECDH failed: {e:?}"
                                 ))
                             })?;
 
diff --git a/openpgp-card/src/algorithm.rs b/openpgp-card/src/algorithm.rs
index 0e81124..47f6d7e 100644
--- a/openpgp-card/src/algorithm.rs
+++ b/openpgp-card/src/algorithm.rs
@@ -45,7 +45,7 @@ impl TryFrom<&str> for AlgoSimple {
             "NIST384" => NIST384,
             "NIST521" => NIST521,
             "Curve25519" => Curve25519,
-            _ => return Err(Error::UnsupportedAlgo(format!("unexpected algo {}", algo))),
+            _ => return Err(Error::UnsupportedAlgo(format!("unexpected algo {algo}"))),
         })
     }
 }
@@ -175,7 +175,7 @@ impl fmt::Display for Algo {
                 )
             }
             Self::Unknown(u) => {
-                write!(f, "Unknown: {:?}", u)
+                write!(f, "Unknown: {u:?}")
             }
         }
     }
@@ -188,10 +188,7 @@ impl Algo {
         match self {
             Algo::Rsa(rsa) => Self::rsa_algo_attrs(rsa),
             Algo::Ecc(ecc) => Self::ecc_algo_attrs(ecc.oid(), ecc.ecc_type()),
-            _ => Err(Error::UnsupportedAlgo(format!(
-                "Unexpected Algo {:?}",
-                self
-            ))),
+            _ => Err(Error::UnsupportedAlgo(format!("Unexpected Algo {self:?}"))),
         }
     }
 
@@ -351,7 +348,7 @@ impl TryFrom<&[u8]> for Curve {
             oid::ED448 => Ed448,
             oid::X448 => X448,
 
-            _ => return Err(Error::ParseError(format!("Unknown curve OID {:?}", oid))),
+            _ => return Err(Error::ParseError(format!("Unknown curve OID {oid:?}"))),
         };
 
         Ok(curve)
diff --git a/openpgp-card/src/apdu/command.rs b/openpgp-card/src/apdu/command.rs
index 2e37bfe..cdb6497 100644
--- a/openpgp-card/src/apdu/command.rs
+++ b/openpgp-card/src/apdu/command.rs
@@ -93,8 +93,8 @@ impl Command {
         if !ext_len {
             assert!(
                 len <= 0xff,
-                "unexpected: len = {:x?}, but ext says Short",
-                len
+                "{}",
+                "unexpected: len = {len:x?}, but ext says Short"
             );
         }
 
diff --git a/openpgp-card/src/card_do.rs b/openpgp-card/src/card_do.rs
index 1ea5560..6276dd5 100644
--- a/openpgp-card/src/card_do.rs
+++ b/openpgp-card/src/card_do.rs
@@ -112,8 +112,7 @@ impl ApplicationRelatedData {
             Algo::try_from(&aa.serialize()[..])
         } else {
             Err(Error::NotFound(format!(
-                "Failed to get algorithm attributes for {:?}.",
-                key_type
+                "Failed to get algorithm attributes for {key_type:?}."
             )))
         }
     }
@@ -317,7 +316,7 @@ impl TryFrom<Vec<u8>> for UIF {
         if v.len() == 2 {
             Ok(UIF(v.try_into().unwrap()))
         } else {
-            Err(Error::ParseError(format!("Can't get UID from {:x?}", v)))
+            Err(Error::ParseError(format!("Can't get UID from {v:x?}")))
         }
     }
 }
@@ -388,7 +387,7 @@ impl Display for TouchPolicy {
             TouchPolicy::Fixed => write!(f, "Fixed"),
             TouchPolicy::Cached => write!(f, "Cached"),
             TouchPolicy::CachedFixed => write!(f, "CachedFixed"),
-            TouchPolicy::Unknown(i) => write!(f, "Unknown({})", i),
+            TouchPolicy::Unknown(i) => write!(f, "Unknown({i})"),
         }
     }
 }
@@ -575,7 +574,7 @@ impl Display for KeyStatus {
             KeyStatus::NotPresent => write!(f, "not present"),
             KeyStatus::Generated => write!(f, "generated"),
             KeyStatus::Imported => write!(f, "imported"),
-            KeyStatus::Unknown(i) => write!(f, "unknown status ({})", i),
+            KeyStatus::Unknown(i) => write!(f, "unknown status ({i})"),
         }
     }
 }
@@ -755,19 +754,15 @@ impl Display for ExtendedCapabilities {
 
         // v2
         if let Some(max_cmd_len) = self.max_cmd_len {
-            writeln!(f, "- maximum command length: {}", max_cmd_len)?;
+            writeln!(f, "- maximum command length: {max_cmd_len}")?;
         }
         if let Some(max_resp_len) = self.max_resp_len {
-            writeln!(f, "- maximum response length: {}", max_resp_len)?;
+            writeln!(f, "- maximum response length: {max_resp_len}")?;
         }
 
         // v3
         if let Some(max_len_special_do) = self.max_len_special_do {
-            writeln!(
-                f,
-                "- maximum length for special DOs: {}",
-                max_len_special_do
-            )?;
+            writeln!(f, "- maximum length for special DOs: {max_len_special_do}")?;
         }
         if self.pin_block_2_format_support == Some(true) {
             writeln!(f, "- PIN block 2 format supported")?;
@@ -809,7 +804,7 @@ impl Display for CardholderRelatedData {
             writeln!(f, "Name: {}", Self::latin1_to_string(name))?;
         }
         if let Some(sex) = self.sex {
-            writeln!(f, "Sex: {}", sex)?;
+            writeln!(f, "Sex: {sex}")?;
         }
         if let Some(lang) = &self.lang {
             for (n, l) in lang.iter().enumerate() {
@@ -839,7 +834,7 @@ impl Display for Sex {
             Self::Male => write!(f, "Male"),
             Self::Female => write!(f, "Female"),
             Self::NotApplicable => write!(f, "Not applicable"),
-            Self::UndefinedValue(v) => write!(f, "Undefined value {:x?}", v),
+            Self::UndefinedValue(v) => write!(f, "Undefined value {v:x?}"),
         }
     }
 }
@@ -884,7 +879,7 @@ impl Display for Lang {
                 write!(f, "{}{}", v[0] as char, v[1] as char)
             }
             Self::Invalid(v) => {
-                write!(f, "{:x?}", v)
+                write!(f, "{v:x?}")
             }
         }
     }
@@ -1023,8 +1018,7 @@ pub(crate) fn complete<O>(result: nom::IResult<&[u8], O>) -> Result<O, Error> {
         Ok(output)
     } else {
         Err(Error::ParseError(format!(
-            "Parsing incomplete, trailing data: {:x?}",
-            rem
+            "Parsing incomplete, trailing data: {rem:x?}"
         )))
     }
 }
diff --git a/openpgp-card/src/card_do/algo_info.rs b/openpgp-card/src/card_do/algo_info.rs
index 37bbfd1..1c90724 100644
--- a/openpgp-card/src/card_do/algo_info.rs
+++ b/openpgp-card/src/card_do/algo_info.rs
@@ -33,7 +33,7 @@ impl fmt::Display for AlgoInfo {
                 KeyType::Authentication => "AUT",
                 KeyType::Attestation => "ATT",
             };
-            writeln!(f, "{}: {} ", kt, a)?;
+            writeln!(f, "{kt}: {a} ")?;
         }
         Ok(())
     }
diff --git a/openpgp-card/src/card_do/extended_cap.rs b/openpgp-card/src/card_do/extended_cap.rs
index 542d2c9..1a34853 100644
--- a/openpgp-card/src/card_do/extended_cap.rs
+++ b/openpgp-card/src/card_do/extended_cap.rs
@@ -80,8 +80,7 @@ impl TryFrom<(&[u8], u16)> for ExtendedCapabilities {
 
             if i8 > 1 {
                 return Err(Error::ParseError(format!(
-                    "Illegal value '{}' for pin_block_2_format_support",
-                    i8
+                    "Illegal value '{i8}' for pin_block_2_format_support"
                 )));
             }
 
@@ -89,8 +88,7 @@ impl TryFrom<(&[u8], u16)> for ExtendedCapabilities {
 
             if i9 > 1 {
                 return Err(Error::ParseError(format!(
-                    "Illegal value '{}' for mse_command_support",
-                    i9
+                    "Illegal value '{i9}' for mse_command_support"
                 )));
             }
             mse_command_support = Some(i9 != 0);
diff --git a/openpgp-card/src/card_do/fingerprint.rs b/openpgp-card/src/card_do/fingerprint.rs
index 6c0ea9a..1f86572 100644
--- a/openpgp-card/src/card_do/fingerprint.rs
+++ b/openpgp-card/src/card_do/fingerprint.rs
@@ -44,14 +44,14 @@ impl Fingerprint {
 
 impl fmt::Display for Fingerprint {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        write!(f, "{:X}", self)
+        write!(f, "{self:X}")
     }
 }
 
 impl fmt::UpperHex for Fingerprint {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         for b in &self.0 {
-            write!(f, "{:02X}", b)?;
+            write!(f, "{b:02X}")?;
         }
         Ok(())
     }
@@ -133,9 +133,6 @@ mod test {
 
         let fp = Fingerprint::try_from(&data1[..]).expect("failed to parse fingerprint");
 
-        assert_eq!(
-            format!("{}", fp),
-            "B7CD9F76371E077F761C826555543E6D656D1D80"
-        );
+        assert_eq!(format!("{fp}"), "B7CD9F76371E077F761C826555543E6D656D1D80");
     }
 }
diff --git a/openpgp-card/src/card_do/historical.rs b/openpgp-card/src/card_do/historical.rs
index 971bb40..f12e759 100644
--- a/openpgp-card/src/card_do/historical.rs
+++ b/openpgp-card/src/card_do/historical.rs
@@ -100,8 +100,7 @@ impl TryFrom<&[u8]> for HistoricalBytes {
             // historical bytes cannot be this short
 
             return Err(Error::ParseError(format!(
-                "Historical bytes too short ({} bytes), must be >= 4",
-                len
+                "Historical bytes too short ({len} bytes), must be >= 4"
             )));
         }
 
diff --git a/openpgp-card/src/keys.rs b/openpgp-card/src/keys.rs
index e3511e6..b283428 100644
--- a/openpgp-card/src/keys.rs
+++ b/openpgp-card/src/keys.rs
@@ -76,7 +76,7 @@ pub(crate) fn gen_key_with_metadata(
     // Store creation timestamp (unix time format, limited to u32)
     let ts = time
         .duration_since(UNIX_EPOCH)
-        .map_err(|e| Error::InternalError(format!("This should never happen {}", e)))?
+        .map_err(|e| Error::InternalError(format!("This should never happen {e}")))?
         .as_secs() as u32;
 
     let ts = ts.into();
@@ -111,8 +111,7 @@ fn tlv_to_pubkey(tlv: &Tlv, algo: &Algo) -> Result<PublicKeyMaterial, crate::Err
         }
 
         (_, _, _) => Err(Error::UnsupportedAlgo(format!(
-            "Unexpected public key material from card {:?}",
-            tlv
+            "Unexpected public key material from card {tlv:?}"
         ))),
     }
 }
@@ -285,8 +284,7 @@ pub(crate) fn determine_ecc_attrs(
         if algos.is_empty() {
             // If oid is not in algo_info, return error.
             return Err(Error::UnsupportedAlgo(format!(
-                "Oid {:?} unsupported according to algo_info",
-                oid
+                "Oid {oid:?} unsupported according to algo_info"
             )));
         }
 
@@ -340,8 +338,7 @@ fn card_algo_rsa(algo_info: AlgoInfo, key_type: KeyType, rsa_bits: u16) -> Resul
     } else {
         // RSA with this bit length is not in algo_info
         Err(Error::UnsupportedAlgo(format!(
-            "RSA {} unsupported according to algo_info",
-            rsa_bits
+            "RSA {rsa_bits} unsupported according to algo_info"
         )))
     }
 }
diff --git a/openpgp-card/src/lib.rs b/openpgp-card/src/lib.rs
index 4119254..a89a12a 100644
--- a/openpgp-card/src/lib.rs
+++ b/openpgp-card/src/lib.rs
@@ -39,7 +39,6 @@ mod openpgp;
 mod tlv;
 
 use std::convert::TryInto;
-use std::ops::{Deref, DerefMut};
 
 use crate::apdu::commands;
 use crate::card_do::ApplicationRelatedData;
@@ -186,19 +185,6 @@ pub trait CardTransaction {
     }
 }
 
-impl<'a> Deref for dyn CardTransaction + Send + Sync + 'a {
-    type Target = dyn CardTransaction + 'a;
-
-    fn deref(&self) -> &Self::Target {
-        self
-    }
-}
-impl<'a> DerefMut for dyn CardTransaction + Send + Sync + 'a {
-    fn deref_mut(&mut self) -> &mut Self::Target {
-        self
-    }
-}
-
 /// Information about the capabilities of a card.
 ///
 /// CardCaps is used to signal capabilities (chaining, extended length support, max
diff --git a/pcsc/src/lib.rs b/pcsc/src/lib.rs
index 1258c45..98dedd6 100644
--- a/pcsc/src/lib.rs
+++ b/pcsc/src/lib.rs
@@ -126,8 +126,7 @@ impl<'b> PcscTransaction<'b> {
                         c.reconnect(mode, pcsc::Protocols::ANY, Disposition::ResetCard)
                             .map_err(|e| {
                                 Error::Smartcard(SmartcardError::Error(format!(
-                                    "Reconnect failed: {:?}",
-                                    e
+                                    "Reconnect failed: {e:?}"
                                 )))
                             })?;
                     }
@@ -139,8 +138,7 @@ impl<'b> PcscTransaction<'b> {
                 Err((_, e)) => {
                     log::trace!("start_tx: error {:?}", e);
                     break Err(Error::Smartcard(SmartcardError::Error(format!(
-                        "Error: {:?}",
-                        e
+                        "Error: {e:?}"
                     ))));
                 }
             };
@@ -162,8 +160,7 @@ impl<'b> PcscTransaction<'b> {
     ) -> Result<ApplicationRelatedData, Error> {
         <dyn CardTransaction>::application_related_data(card_tx).map_err(|e| {
             Error::Smartcard(SmartcardError::Error(format!(
-                "TxClient: failed to get application_related_data {:x?}",
-                e
+                "TxClient: failed to get application_related_data {e:x?}"
             )))
         })
     }
@@ -179,8 +176,7 @@ impl<'b> PcscTransaction<'b> {
             .control(cm_ioctl_get_feature_request, &[], &mut recv)
             .map_err(|e| {
                 Error::Smartcard(SmartcardError::Error(format!(
-                    "GET_FEATURE_REQUEST control call failed: {:?}",
-                    e
+                    "GET_FEATURE_REQUEST control call failed: {e:?}"
                 )))
             })?;
 
@@ -216,7 +212,7 @@ impl CardTransaction for PcscTransaction<'_> {
             .transmit(cmd, &mut resp_buffer)
             .map_err(|e| match e {
                 pcsc::Error::NotTransacted => Error::Smartcard(SmartcardError::NotTransacted),
-                _ => Error::Smartcard(SmartcardError::Error(format!("Transmit failed: {:?}", e))),
+                _ => Error::Smartcard(SmartcardError::Error(format!("Transmit failed: {e:?}"))),
             })?;
 
         Ok(resp.to_vec())
@@ -317,13 +313,13 @@ impl CardTransaction for PcscTransaction<'_> {
             .ok_or_else(|| Error::Smartcard(SmartcardError::Error("no reader_capability".into())))?
             .value()
             .try_into()
-            .map_err(|e| Error::ParseError(format!("unexpected feature data: {:?}", e)))?;
+            .map_err(|e| Error::ParseError(format!("unexpected feature data: {e:?}")))?;
 
         let res = self
             .tx
             .control(u32::from_be_bytes(verify_ioctl).into(), &send, &mut recv)
             .map_err(|e: pcsc::Error| {
-                Error::Smartcard(SmartcardError::Error(format!("pcsc Error: {:?}", e)))
+                Error::Smartcard(SmartcardError::Error(format!("pcsc Error: {e:?}")))
             })?;
 
         log::trace!(" <- pcsc pinpad_verify result: {:x?}", res);
@@ -420,13 +416,13 @@ impl CardTransaction for PcscTransaction<'_> {
             .ok_or_else(|| Error::Smartcard(SmartcardError::Error("no reader_capability".into())))?
             .value()
             .try_into()
-            .map_err(|e| Error::ParseError(format!("unexpected feature data: {:?}", e)))?;
+            .map_err(|e| Error::ParseError(format!("unexpected feature data: {e:?}")))?;
 
         let res = self
             .tx
             .control(u32::from_be_bytes(modify_ioctl).into(), &send, &mut recv)
             .map_err(|e: pcsc::Error| {
-                Error::Smartcard(SmartcardError::Error(format!("pcsc Error: {:?}", e)))
+                Error::Smartcard(SmartcardError::Error(format!("pcsc Error: {e:?}")))
             })?;
 
         log::trace!(" <- pcsc pinpad_modify result: {:x?}", res);
diff --git a/scdc/src/lib.rs b/scdc/src/lib.rs
index 2dc8fb5..2632d84 100644
--- a/scdc/src/lib.rs
+++ b/scdc/src/lib.rs
@@ -103,16 +103,13 @@ impl ScdBackend {
         } else {
             // Create and use a new Agent based on a default Context
             let ctx = Context::new().map_err(|e| {
-                Error::Smartcard(SmartcardError::Error(format!("Context::new failed {}", e)))
+                Error::Smartcard(SmartcardError::Error(format!("Context::new failed {e}")))
             })?;
             RT.lock()
                 .unwrap()
                 .block_on(Agent::connect(&ctx))
                 .map_err(|e| {
-                    Error::Smartcard(SmartcardError::Error(format!(
-                        "Agent::connect failed {}",
-                        e
-                    )))
+                    Error::Smartcard(SmartcardError::Error(format!("Agent::connect failed {e}")))
                 })?
         };
 
@@ -131,8 +128,7 @@ impl ScdBackend {
     fn send2(&mut self, cmd: &str) -> Result<(), Error> {
         self.agent.send(cmd).map_err(|e| {
             Error::Smartcard(SmartcardError::Error(format!(
-                "scdc agent send failed: {}",
-                e
+                "scdc agent send failed: {e}"
             )))
         })
     }
@@ -166,7 +162,7 @@ impl ScdBackend {
     /// Ask scdameon to switch to using a specific OpenPGP card, based on
     /// its `serial`.
     fn select_card(&mut self, serial: &str) -> Result<(), Error> {
-        let send = format!("SCD SERIALNO --demand={}", serial);
+        let send = format!("SCD SERIALNO --demand={serial}");
         self.send2(&send)?;
 
         let rt = RT.lock().unwrap();
@@ -204,7 +200,7 @@ impl ScdBackend {
             log::trace!("select res: {:x?}", response);
 
             if let Err(e) = response {
-                return Err(Error::Smartcard(SmartcardError::Error(format!("{:?}", e))));
+                return Err(Error::Smartcard(SmartcardError::Error(format!("{e:?}"))));
             }
 
             if let Ok(..) = response {
@@ -218,8 +214,7 @@ impl ScdBackend {
         }
 
         Err(Error::Smartcard(SmartcardError::Error(format!(
-            "Error sending command {}",
-            cmd
+            "Error sending command {cmd}"
         ))))
     }
 }
@@ -250,7 +245,7 @@ impl CardTransaction for ScdTransaction<'_> {
             "".to_string()
         };
 
-        let send = format!("SCD APDU {}{}\n", ext, hex);
+        let send = format!("SCD APDU {ext}{hex}\n");
         log::trace!("SCDC command: '{}'", send);
 
         if send.len() > ASSUAN_LINELENGTH {
@@ -268,8 +263,7 @@ impl CardTransaction for ScdTransaction<'_> {
             log::trace!("res: {:x?}", response);
             if response.is_err() {
                 return Err(Error::Smartcard(SmartcardError::Error(format!(
-                    "Unexpected error response from SCD {:?}",
-                    response
+                    "Unexpected error response from SCD {response:?}"
                 ))));
             }
 
diff --git a/tools/src/commands/admin.rs b/tools/src/commands/admin.rs
index 130b08a..8fb686d 100644
--- a/tools/src/commands/admin.rs
+++ b/tools/src/commands/admin.rs
@@ -515,7 +515,7 @@ fn generate_command(
 
     let algo = cmd.algo.map(AlgoSimple::from);
     log::info!(" Key generation will be attempted with algo: {:?}", algo);
-    output.algorithm(format!("{:?}", algo));
+    output.algorithm(format!("{algo:?}"));
 
     // 2) Then, generate keys on the card.
     // We need "admin" access to the card for this).
diff --git a/tools/src/commands/attestation.rs b/tools/src/commands/attestation.rs
index 9d003b1..40b0c20 100644
--- a/tools/src/commands/attestation.rs
+++ b/tools/src/commands/attestation.rs
@@ -187,7 +187,7 @@ fn statement(ident: Option<String>, key: BaseKeySlot) -> Result<(), Box<dyn std:
 
     if !cert.is_empty() {
         let pem = util::pem_encode(cert);
-        println!("{}", pem);
+        println!("{pem}");
     } else {
         println!("Cardholder certificate slot is empty");
     }
diff --git a/tools/src/commands/pin.rs b/tools/src/commands/pin.rs
index 73b42e4..2e7e5c8 100644
--- a/tools/src/commands/pin.rs
+++ b/tools/src/commands/pin.rs
@@ -205,7 +205,7 @@ fn set_user(
     match res {
         Err(err) => {
             println!("\nFailed to change the User PIN!");
-            println!("{:?}", err);
+            println!("{err:?}");
             print_gnuk_note(err, &card)?;
         }
         Ok(_) => println!("\nUser PIN has been set."),
diff --git a/tools/src/commands/status.rs b/tools/src/commands/status.rs
index 06084b9..280bcd5 100644
--- a/tools/src/commands/status.rs
+++ b/tools/src/commands/status.rs
@@ -70,7 +70,7 @@ pub fn print_status(
     // Language Preference
     if let Some(lang) = card.cardholder_related_data()?.lang() {
         for lang in lang {
-            output.language_preference(format!("{}", lang));
+            output.language_preference(format!("{lang}"));
         }
     }
 
@@ -97,7 +97,7 @@ pub fn print_status(
         signature_key.touch_features(format!("{}", uif.features()));
     }
     if let Some(ks) = ki.as_ref().map(|ki| ki.sig_status()) {
-        signature_key.status(format!("{}", ks));
+        signature_key.status(format!("{ks}"));
     }
 
     if let Ok(pkm) = card.public_key_material(KeyType::Signing) {
@@ -125,7 +125,7 @@ pub fn print_status(
         decryption_key.touch_features(format!("{}", uif.features()));
     }
     if let Some(ks) = ki.as_ref().map(|ki| ki.dec_status()) {
-        decryption_key.status(format!("{}", ks));
+        decryption_key.status(format!("{ks}"));
     }
     if let Ok(pkm) = card.public_key_material(KeyType::Decryption) {
         decryption_key.public_key_material(pkm.to_string());
@@ -148,7 +148,7 @@ pub fn print_status(
         authentication_key.touch_features(format!("{}", uif.features()));
     }
     if let Some(ks) = ki.as_ref().map(|ki| ki.aut_status()) {
-        authentication_key.status(format!("{}", ks));
+        authentication_key.status(format!("{ks}"));
     }
     if let Ok(pkm) = card.public_key_material(KeyType::Authentication) {
         authentication_key.public_key_material(pkm.to_string());
@@ -160,7 +160,7 @@ pub fn print_status(
         attestation_key.fingerprint(fp.to_spaced_hex());
     }
     if let Ok(Some(algo)) = card.attestation_key_algorithm_attributes() {
-        attestation_key.algorithm(format!("{}", algo));
+        attestation_key.algorithm(format!("{algo}"));
     }
     if let Ok(Some(kgt)) = card.attestation_key_generation_time() {
         attestation_key.creation_time(format!("{}", kgt.to_datetime()));
@@ -180,7 +180,7 @@ pub fn print_status(
     if let Some(ki) = ki.as_ref() {
         if let Some(n) = (0..ki.num_additional()).find(|&n| ki.additional_ref(n) == 0x81) {
             let ks = ki.additional_status(n);
-            attestation_key.status(format!("{}", ks));
+            attestation_key.status(format!("{ks}"));
         }
     };
 
diff --git a/tools/src/opgpcard.rs b/tools/src/opgpcard.rs
index 00f19b7..731f11a 100644
--- a/tools/src/opgpcard.rs
+++ b/tools/src/opgpcard.rs
@@ -76,9 +76,9 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
 fn output_versions(chosen: OutputVersion) {
     for v in OUTPUT_VERSIONS.iter() {
         if v == &chosen {
-            println!("* {}", v);
+            println!("* {v}");
         } else {
-            println!("  {}", v);
+            println!("  {v}");
         }
     }
 }
diff --git a/tools/src/output/info.rs b/tools/src/output/info.rs
index 5c65b36..9a6cacb 100644
--- a/tools/src/output/info.rs
+++ b/tools/src/output/info.rs
@@ -85,7 +85,7 @@ impl Info {
         if !self.card_capabilities.is_empty() {
             s.push_str("Card Capabilities:\n");
             for c in self.card_capabilities.iter() {
-                s.push_str(&format!("- {}\n", c));
+                s.push_str(&format!("- {c}\n"));
             }
             s.push('\n');
         }
@@ -93,7 +93,7 @@ impl Info {
         if !self.card_service_data.is_empty() {
             s.push_str("Card service data:\n");
             for c in self.card_service_data.iter() {
-                s.push_str(&format!("- {}\n", c));
+                s.push_str(&format!("- {c}\n"));
             }
             s.push('\n');
         }
@@ -101,27 +101,27 @@ impl Info {
         if !self.extended_length_info.is_empty() {
             s.push_str("Extended Length Info:\n");
             for c in self.extended_length_info.iter() {
-                s.push_str(&format!("- {}\n", c));
+                s.push_str(&format!("- {c}\n"));
             }
             s.push('\n');
         }
 
         s.push_str("Extended Capabilities:\n");
         for c in self.extended_capabilities.iter() {
-            s.push_str(&format!("- {}\n", c));
+            s.push_str(&format!("- {c}\n"));
         }
         s.push('\n');
 
         if let Some(algos) = &self.algorithms {
             s.push_str("Supported algorithms:\n");
             for c in algos.iter() {
-                s.push_str(&format!("- {}\n", c));
+                s.push_str(&format!("- {c}\n"));
             }
             s.push('\n');
         }
 
         if let Some(v) = &self.firmware_version {
-            s.push_str(&format!("Firmware Version: {}\n", v));
+            s.push_str(&format!("Firmware Version: {v}\n"));
         }
 
         Ok(s)
diff --git a/tools/src/output/list.rs b/tools/src/output/list.rs
index eb2d010..8483f59 100644
--- a/tools/src/output/list.rs
+++ b/tools/src/output/list.rs
@@ -22,7 +22,7 @@ impl List {
         } else {
             let mut s = "Available OpenPGP cards:\n".to_string();
             for id in self.idents.iter() {
-                s.push_str(&format!("  {}\n", id));
+                s.push_str(&format!("  {id}\n"));
             }
             s
         };
diff --git a/tools/src/output/ssh.rs b/tools/src/output/ssh.rs
index 39429c5..5ba0467 100644
--- a/tools/src/output/ssh.rs
+++ b/tools/src/output/ssh.rs
@@ -30,10 +30,10 @@ impl Ssh {
         let mut s = format!("OpenPGP card {}\n\n", self.ident);
 
         if let Some(fp) = &self.authentication_key_fingerprint {
-            s.push_str(&format!("Authentication key fingerprint:\n{}\n\n", fp));
+            s.push_str(&format!("Authentication key fingerprint:\n{fp}\n\n"));
         }
         if let Some(key) = &self.ssh_public_key {
-            s.push_str(&format!("SSH public key:\n{}\n", key));
+            s.push_str(&format!("SSH public key:\n{key}\n"));
         }
 
         Ok(s)
diff --git a/tools/src/output/status.rs b/tools/src/output/status.rs
index 64eaa32..e65e01b 100644
--- a/tools/src/output/status.rs
+++ b/tools/src/output/status.rs
@@ -112,14 +112,14 @@ impl Status {
         let mut nl = false;
         if let Some(name) = &self.cardholder_name {
             if !name.is_empty() {
-                s.push_str(&format!("Cardholder: {}\n", name));
+                s.push_str(&format!("Cardholder: {name}\n"));
                 nl = true;
             }
         }
 
         if let Some(url) = &self.certificate_url {
             if !url.is_empty() {
-                s.push_str(&format!("Certificate URL: {}\n", url));
+                s.push_str(&format!("Certificate URL: {url}\n"));
                 nl = true;
             }
         }
@@ -127,7 +127,7 @@ impl Status {
         if !self.language_preferences.is_empty() {
             let prefs = self.language_preferences.to_vec().join(", ");
             if !prefs.is_empty() {
-                s.push_str(&format!("Language preferences: '{}'\n", prefs));
+                s.push_str(&format!("Language preferences: '{prefs}'\n"));
                 nl = true;
             }
         }
@@ -138,7 +138,7 @@ impl Status {
 
         s.push_str("Signature key:\n");
         for line in self.signature_key.format(self.verbose, self.pkm) {
-            s.push_str(&format!("  {}\n", line));
+            s.push_str(&format!("  {line}\n"));
         }
         if self.verbose {
             if self.user_pin_valid_for_only_one_signature {
@@ -152,13 +152,13 @@ impl Status {
 
         s.push_str("Decryption key:\n");
         for line in self.decryption_key.format(self.verbose, self.pkm) {
-            s.push_str(&format!("  {}\n", line));
+            s.push_str(&format!("  {line}\n"));
         }
         s.push('\n');
 
         s.push_str("Authentication key:\n");
         for line in self.authentication_key.format(self.verbose, self.pkm) {
-            s.push_str(&format!("  {}\n", line));
+            s.push_str(&format!("  {line}\n"));
         }
         s.push('\n');
 
@@ -167,7 +167,7 @@ impl Status {
                 if attestation_key.touch_policy.is_some() || attestation_key.algorithm.is_some() {
                     s.push_str("Attestation key:\n");
                     for line in attestation_key.format(self.verbose, self.pkm) {
-                        s.push_str(&format!("  {}\n", line));
+                        s.push_str(&format!("  {line}\n"));
                     }
                     s.push('\n');
                 }
@@ -183,10 +183,7 @@ impl Status {
 
         if self.verbose {
             for (keyref, status) in self.additional_key_statuses.iter() {
-                s.push_str(&format!(
-                    "Additional key status (#{}): {}\n",
-                    keyref, status
-                ));
+                s.push_str(&format!("Additional key status (#{keyref}): {status}\n"));
             }
         }
 
@@ -311,30 +308,30 @@ impl KeySlotInfo {
         let mut lines = vec![];
 
         if let Some(fp) = &self.fingerprint {
-            lines.push(format!("Fingerprint: {}", fp));
+            lines.push(format!("Fingerprint: {fp}"));
         } else {
             lines.push("Fingerprint: [unset]".to_string());
         }
         if let Some(ts) = &self.creation_time {
-            lines.push(format!("Creation Time: {}", ts));
+            lines.push(format!("Creation Time: {ts}"));
         }
         if let Some(a) = &self.algorithm {
-            lines.push(format!("Algorithm: {}", a));
+            lines.push(format!("Algorithm: {a}"));
         }
 
         if verbose {
             if let Some(policy) = &self.touch_policy {
                 if let Some(features) = &self.touch_features {
-                    lines.push(format!("Touch policy: {} (features: {})", policy, features));
+                    lines.push(format!("Touch policy: {policy} (features: {features})"));
                 }
             }
             if let Some(status) = &self.status {
-                lines.push(format!("Key Status: {}", status));
+                lines.push(format!("Key Status: {status}"));
             }
         }
         if pkm {
             if let Some(material) = &self.public_key_material {
-                lines.push(format!("Public key material: {}", material));
+                lines.push(format!("Public key material: {material}"));
             }
         }
 
diff --git a/tools/src/util.rs b/tools/src/util.rs
index af846e1..a9aa949 100644
--- a/tools/src/util.rs
+++ b/tools/src/util.rs
@@ -133,7 +133,7 @@ pub(crate) fn open_or_stdout(f: Option<&Path>) -> Result<Box<dyn std::io::Write
 }
 
 fn get_ssh_pubkey(pkm: &PublicKeyMaterial, ident: String) -> Result<sshkeys::PublicKey> {
-    let cardname = format!("opgpcard:{}", ident);
+    let cardname = format!("opgpcard:{ident}");
 
     let (key_type, kind) = match pkm {
         PublicKeyMaterial::R(rsa) => {