diff --git a/crypto/base_test.go b/crypto/base_test.go
index c4429c76..35924282 100644
--- a/crypto/base_test.go
+++ b/crypto/base_test.go
@@ -35,8 +35,8 @@ func readTestFile(name string, trimNewlines bool) string {
 func init() {
 	testPGP = PGP()
 	testPGP.defaultTime = NewConstantClock(testTime) // 2019-05-13T13:37:07+00:00
-	testProfiles = []*profile.Custom{profile.Default(), profile.RFC4880(), profile.RFC9580()}
-	testProfileNames = []string{"Default", "RFC4880", "RFC9580"}
+	testProfiles = []*profile.Custom{profile.Default(), profile.RFC4880(), profile.RFC9580(), profile.PQC()}
+	testProfileNames = []string{"Default", "RFC4880", "RFC9580", "PQC"}
 	initEncDecTest()
 	initGenerateKeys()
 	initArmoredKeys()
diff --git a/crypto/key_clear.go b/crypto/key_clear.go
index b19aae86..1721d42d 100644
--- a/crypto/key_clear.go
+++ b/crypto/key_clear.go
@@ -12,8 +12,14 @@ import (
 	"github.com/ProtonMail/go-crypto/openpgp/ed448"
 	"github.com/ProtonMail/go-crypto/openpgp/eddsa"
 	"github.com/ProtonMail/go-crypto/openpgp/elgamal"
+	"github.com/ProtonMail/go-crypto/openpgp/mldsa_eddsa"
+	"github.com/ProtonMail/go-crypto/openpgp/mlkem_ecdh"
+	"github.com/ProtonMail/go-crypto/openpgp/slhdsa"
 	"github.com/ProtonMail/go-crypto/openpgp/x25519"
 	"github.com/ProtonMail/go-crypto/openpgp/x448"
+
+	"github.com/cloudflare/circl/sign/mldsa/mldsa65"
+	"github.com/cloudflare/circl/sign/mldsa/mldsa87"
 )
 
 // Clear zeroes the sensitive data in the session key.
@@ -75,6 +81,12 @@ func clearPrivateKey(privateKey interface{}) error {
 		return clearX448PrivateKey(priv)
 	case *ed448.PrivateKey:
 		return clearEd448PrivateKey(priv)
+	case *mlkem_ecdh.PrivateKey:
+		return clearMlKemECDHPrivateKey(priv)
+	case *mldsa_eddsa.PrivateKey:
+		return clearMlDsaEdDSAPrivateKey(priv)
+	case *slhdsa.PrivateKey:
+		return clearSlhDsaPrivateKey(priv)
 	default:
 		return errors.New("gopenpgp: unknown private key")
 	}
@@ -164,3 +176,41 @@ func clearEd448PrivateKey(priv *ed448.PrivateKey) error {
 
 	return nil
 }
+
+func clearMlKemECDHPrivateKey(priv *mlkem_ecdh.PrivateKey) error {
+	// Note: the priv.SecretMlkem type is internal in circl, so we can't clear its fields here.
+	// And, the key material is stored in a slice, so we can't overwrite it with zeros here.
+	// The best we can do is let the garbage collector clean it up.
+	priv.SecretMlkem = nil
+	clearMem(priv.SecretMlkemSeed)
+	clearMem(priv.SecretEc)
+
+	return nil
+}
+
+func clearMlDsaEdDSAPrivateKey(priv *mldsa_eddsa.PrivateKey) (err error) {
+	// Note: the priv.SecretMldsa type is internal in circl, so we can't clear its fields here.
+	// Instead, we overwrite the entire struct with zero values.
+	switch secretMldsa := priv.SecretMldsa.(type) {
+	case *mldsa65.PrivateKey:
+		*secretMldsa = mldsa65.PrivateKey{}
+	case *mldsa87.PrivateKey:
+		*secretMldsa = mldsa87.PrivateKey{}
+	default:
+		err = errors.New("gopenpgp: unexpected ML-DSA private key type")
+	}
+	priv.SecretMldsa = nil
+	clearMem(priv.SecretMldsaSeed)
+	clearMem(priv.SecretEc)
+
+	return
+}
+
+func clearSlhDsaPrivateKey(priv *slhdsa.PrivateKey) error {
+	// Note: the priv.SecretSlhdsa type is internal in circl, so we can't clear its fields here.
+	// And, the key material is stored in a slice, so we can't overwrite it with zeros here.
+	// The best we can do is let the garbage collector clean it up.
+	priv.SecretSlhdsa = nil
+
+	return nil
+}
diff --git a/profile/preset.go b/profile/preset.go
index 01ce53a1..8ec9844e 100644
--- a/profile/preset.go
+++ b/profile/preset.go
@@ -80,3 +80,39 @@ func RFC9580() *Custom {
 		V6: true,
 	}
 }
+
+func PQC() *Custom {
+	setKeyAlgorithm := func(cfg *packet.Config, securityLevel int8) {
+		switch securityLevel {
+		case constants.HighSecurity:
+			cfg.Algorithm = packet.PubKeyAlgoMldsa87Ed448
+		default:
+			cfg.Algorithm = packet.PubKeyAlgoMldsa65Ed25519
+		}
+	}
+	return &Custom{
+		SetKeyAlgorithm:      setKeyAlgorithm,
+		Hash:                 crypto.SHA512,
+		CipherEncryption:     packet.CipherAES256,
+		CipherKeyEncryption:  packet.CipherAES256,
+		CompressionAlgorithm: packet.CompressionZLIB,
+		AeadKeyEncryption: &packet.AEADConfig{
+			DefaultMode: packet.AEADModeGCM,
+		},
+		AeadEncryption: &packet.AEADConfig{
+			DefaultMode: packet.AEADModeGCM,
+		},
+		CompressionConfiguration: &packet.CompressionConfig{
+			Level: 6,
+		},
+		S2kKeyEncryption: &s2k.Config{
+			S2KMode:      s2k.Argon2S2K,
+			Argon2Config: &s2k.Argon2Config{},
+		},
+		S2kEncryption: &s2k.Config{
+			S2KMode:      s2k.Argon2S2K,
+			Argon2Config: &s2k.Argon2Config{},
+		},
+		V6: true,
+	}
+}