diff --git a/Cargo.toml b/Cargo.toml
index a89bc30..e2e42f5 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -22,7 +22,7 @@ jsonwebkey = { version = "0.3.5", features = ["pkcs-convert"] }
 tokio = { version = "1.43.0", features = ["full"] }
 
 [dependencies.serde_with]
-version = "3.11.0"
+version = "3.14.0"
 features = ["base64", "chrono"]
 
 [dev-dependencies]
diff --git a/deny.toml b/deny.toml
index 82a265b..6010bd4 100644
--- a/deny.toml
+++ b/deny.toml
@@ -107,6 +107,7 @@ allow = [
     "MIT",
     "Apache-2.0",
     "BSD-3-Clause",
+    "CDLA-Permissive-2.0",
     "ISC",
     "OpenSSL",
     # Unicode-DFS-2016 is superseded by Unicode-3.0
diff --git a/examples/challenge_response.rs b/examples/challenge_response.rs
index b9aeb45..40b6cd9 100644
--- a/examples/challenge_response.rs
+++ b/examples/challenge_response.rs
@@ -10,8 +10,8 @@ fn my_evidence_builder(
     accept: &[String],
     token: Vec<u8>,
 ) -> Result<(Vec<u8>, String), Error> {
-    println!("server challenge: {:?}", nonce);
-    println!("acceptable media types: {:#?}", accept);
+    println!("server challenge: {nonce:?}");
+    println!("acceptable media types: {accept:#?}");
 
     let mut token = token;
     if token.is_empty() {
@@ -45,7 +45,7 @@ async fn main() {
         .get_api_endpoint("newChallengeResponseSession")
         .expect("Could not locate a newChallengeResponseSession endpoint");
 
-    let api_endpoint = format!("{}{}", base_url, relative_endpoint);
+    let api_endpoint = format!("{base_url}{relative_endpoint}");
 
     // create a ChallengeResponse object
     let cr = ChallengeResponseBuilder::new()
@@ -58,7 +58,7 @@ async fn main() {
     // alternatively, to let Veraison pick the challenge: "let nonce = Nonce::Size(32);"
 
     match cr.run(nonce, my_evidence_builder, Vec::new()).await {
-        Err(e) => println!("Error: {}", e),
-        Ok(attestation_result) => println!("Attestation Result: {}", attestation_result),
+        Err(e) => println!("Error: {e}"),
+        Ok(attestation_result) => println!("Attestation Result: {attestation_result}"),
     }
 }
diff --git a/src/lib.rs b/src/lib.rs
index 493e8b8..989644e 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -49,7 +49,7 @@ impl std::fmt::Debug for Error {
             | Error::ApiError(e)
             | Error::CallbackError(e)
             | Error::DataConversionError(e) => {
-                write!(f, "{}", e)
+                write!(f, "{e}")
             }
         }
     }
@@ -263,8 +263,7 @@ impl ChallengeResponse {
                     Err(Error::NotImplementedError("asynchronous model".to_string()))
                 }
                 status => Err(Error::ApiError(format!(
-                    "session response has unexpected success status: {}",
-                    status,
+                    "session response has unexpected success status: {status}",
                 ))),
             }
         } else {
@@ -556,6 +555,7 @@ impl Discovery {
     }
 }
 
+#[allow(dead_code)]
 #[derive(serde::Deserialize)]
 struct ProblemDetails {
     r#type: String,