diff --git a/Cargo.lock b/Cargo.lock
index 6b417ee..65b7c68 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -70,9 +70,9 @@ dependencies = [
 
 [[package]]
 name = "asn1-rs"
-version = "0.3.1"
+version = "0.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "30ff05a702273012438132f449575dbc804e27b2f3cbe3069aa237d26c98fa33"
+checksum = "7f6fd5ddaf0351dff5b8da21b2fb4ff8e08ddd02857f0bf69c47639106c0fff0"
 dependencies = [
  "asn1-rs-derive",
  "asn1-rs-impl",
@@ -86,9 +86,9 @@ dependencies = [
 
 [[package]]
 name = "asn1-rs-derive"
-version = "0.1.0"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "db8b7511298d5b7784b40b092d9e9dcd3a627a5707e4b5e507931ab0d44eeebf"
+checksum = "726535892e8eae7e70657b4c8ea93d26b8553afb1ce617caee529ef96d7dee6c"
 dependencies = [
  "proc-macro2",
  "quote 1.0.33",
@@ -153,12 +153,6 @@ version = "0.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b41b7ea54a0c9d92199de89e20e58d49f02f8e699814ef3fdf266f6f748d15c7"
 
-[[package]]
-name = "base64"
-version = "0.13.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9e1b586273c5702936fe7b7d6896644d8be71e6314cfe09d3167c95f712589e8"
-
 [[package]]
 name = "base64"
 version = "0.21.2"
@@ -615,9 +609,9 @@ dependencies = [
 
 [[package]]
 name = "der-parser"
-version = "7.0.0"
+version = "8.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fe398ac75057914d7d07307bf67dc7f3f574a26783b4fc7805a20ffa9f506e82"
+checksum = "dbd676fbbab537128ef0278adb5576cf363cff6aa22a7b24effe97347cfab61e"
 dependencies = [
  "asn1-rs",
  "displaydoc",
@@ -1454,9 +1448,9 @@ dependencies = [
 
 [[package]]
 name = "oid-registry"
-version = "0.4.0"
+version = "0.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "38e20717fa0541f39bd146692035c37bedfa532b3e5071b35761082407546b2a"
+checksum = "9bedf36ffb6ba96c2eb7144ef6270557b52e54b20c0a8e1eb2ff99a6c6959bff"
 dependencies = [
  "asn1-rs",
 ]
@@ -3065,12 +3059,11 @@ dependencies = [
 
 [[package]]
 name = "x509-parser"
-version = "0.13.2"
+version = "0.15.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9fb9bace5b5589ffead1afb76e43e34cff39cd0f3ce7e170ae0c29e53b88eb1c"
+checksum = "7069fba5b66b9193bd2c5d3d4ff12b839118f6bcbef5328efafafb5395cf63da"
 dependencies = [
  "asn1-rs",
- "base64 0.13.1",
  "data-encoding",
  "der-parser",
  "lazy_static",
diff --git a/Cargo.toml b/Cargo.toml
index 731cc31..d5b624b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -29,7 +29,7 @@ pem = "3.0"
 yubikey = { version = "0.8", features = ["untested"] }
 yubico_manager = "0.9"
 x509 = "0.2"
-x509-parser = "0.13"
+x509-parser = "0.15"
 ssh-agent = { version = "0.2", features = ["agent"] }
 p256 = { version = "0.13", features = ["pem", "ecdh"] }
 spki = { version = "0.7", features = ["pem"] }
diff --git a/src/cmd_piv.rs b/src/cmd_piv.rs
index 5d4bf04..a3a4e41 100644
--- a/src/cmd_piv.rs
+++ b/src/cmd_piv.rs
@@ -113,7 +113,7 @@ fn print_cert_info(yubikey: &mut YubiKey, slot: SlotId, detail_output: bool) ->
                 information!("Issuer: {}", cert.tbs_certificate.issuer);
                 information!("Certificate fingerprint(SHA256): {}", hex::encode(certificate_fingerprint_sha256));
                 information!("Public key fingerprint(SHA256): {}", hex::encode(public_key_fingerprint_sha256));
-                information!("Not Before: {}", cert.tbs_certificate.validity.not_before.to_rfc2822());
+                information!("Not Before: {}", cert.tbs_certificate.validity.not_before.to_rfc2822().unwrap_or_else(|e| format!("Err: {}", e)));
 
                 let mut not_after_desc = String::new();
                 let not_after_timestamp = cert.tbs_certificate.validity.not_after.timestamp();
@@ -125,7 +125,10 @@ fn print_cert_info(yubikey: &mut YubiKey, slot: SlotId, detail_output: bool) ->
                     let valid_time = simpledateformat::format_human(Duration::from_secs((not_after_timestamp - now_timestamp) as u64));
                     not_after_desc.push_str(&format!("(left {})", valid_time));
                 }
-                information!("Not After: {}  {}", cert.tbs_certificate.validity.not_after.to_rfc2822(), not_after_desc);
+                information!("Not After: {}  {}",
+                    cert.tbs_certificate.validity.not_after.to_rfc2822().unwrap_or_else(|e| format!("Err: {}", e)),
+                    not_after_desc
+                );
             }
             _ => {
                 warning!("Failed to parse certificate");
diff --git a/src/pkiutil.rs b/src/pkiutil.rs
index 9785f5f..59aa965 100644
--- a/src/pkiutil.rs
+++ b/src/pkiutil.rs
@@ -23,9 +23,9 @@ pub fn get_pki_algorithm(algorithm_identifier: &AlgorithmIdentifier) -> XResult<
     }
     if "1.2.840.10045.2.1" == algorithm_id_string {
         if let Some(parameters) = &algorithm_identifier.parameters {
-            if let Ok(content) = parameters.content.as_oid() {
-                let content_id_string = content.to_id_string();
-                return match content_id_string.as_str() {
+            if let Ok(parameter_oid) = parameters.as_oid() {
+                let parameter_oid_id_string = parameter_oid.to_id_string();
+                return match parameter_oid_id_string.as_str() {
                     "1.2.840.10045.3.1.7" => Ok(PkiAlgorithm::P256),
                     "1.3.132.0.34" => Ok(PkiAlgorithm::P384),
                     "1.3.132.0.35" => Ok(PkiAlgorithm::P521),