diff --git a/verifiers/internal/gcb/provenance.go b/verifiers/internal/gcb/provenance.go
index 964b40652..5bbf85e23 100644
--- a/verifiers/internal/gcb/provenance.go
+++ b/verifiers/internal/gcb/provenance.go
@@ -3,6 +3,7 @@ package gcb
 import (
 	"crypto/sha256"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"os"
 	"reflect"
@@ -54,7 +55,7 @@ func ProvenanceFromBytes(payload []byte) (*Provenance, error) {
 	var prov gloudProvenance
 	err := json.Unmarshal(payload, &prov)
 	if err != nil {
-		return nil, fmt.Errorf("%w: %v", serrors.ErrorInvalidDssePayload, err)
+		return nil, fmt.Errorf("%w: %w", serrors.ErrorInvalidDssePayload, err)
 	}
 
 	return &Provenance{
@@ -492,7 +493,7 @@ func (p *Provenance) VerifyBranch(branch string) error {
 func (p *Provenance) VerifyTag(expectedTag string) error {
 	provenanceTag, err := p.getTag()
 	if err != nil {
-		return fmt.Errorf("%w: %v", serrors.ErrorMismatchTag, err.Error())
+		return fmt.Errorf("%w: %w", serrors.ErrorMismatchTag, err)
 	}
 
 	if provenanceTag != expectedTag {
@@ -505,7 +506,7 @@ func (p *Provenance) VerifyTag(expectedTag string) error {
 func (p *Provenance) VerifyVersionedTag(expectedTag string) error {
 	provenanceTag, err := p.getTag()
 	if err != nil {
-		return fmt.Errorf("%w: %v", serrors.ErrorMismatchVersionedTag, err.Error())
+		return fmt.Errorf("%w: %w", serrors.ErrorMismatchVersionedTag, err)
 	}
 	return utils.VerifyVersionedTag(provenanceTag, expectedTag)
 }
@@ -611,7 +612,7 @@ func (p *Provenance) verifySignatures(prov *provenance) error {
 		return nil
 	}
 
-	return fmt.Errorf("%w: %v", serrors.ErrorNoValidSignature, errs)
+	return fmt.Errorf("%w: %w", serrors.ErrorNoValidSignature, errors.Join(errs...))
 }
 
 // VerifySignature verifiers the signature for a provenance.
@@ -632,5 +633,5 @@ func (p *Provenance) VerifySignature() error {
 		return nil
 	}
 
-	return fmt.Errorf("%w: %v", serrors.ErrorNoValidSignature, errs)
+	return fmt.Errorf("%w: %w", serrors.ErrorNoValidSignature, errors.Join(errs...))
 }
diff --git a/verifiers/internal/gha/builder.go b/verifiers/internal/gha/builder.go
index dbe0479be..2ce8e3b6f 100644
--- a/verifiers/internal/gha/builder.go
+++ b/verifiers/internal/gha/builder.go
@@ -147,7 +147,7 @@ func verifyTrustedBuilderID(certBuilderID, certTag string, expectedBuilderID *st
 	// Note: the certificate builderID has the form `name@refs/tags/v1.2.3`,
 	// so we pass `allowRef = true`.
 	if err := trustedBuilderID.MatchesLoose(*expectedBuilderID, true); err != nil {
-		return nil, false, fmt.Errorf("%w: %v", serrors.ErrorUntrustedReusableWorkflow, err)
+		return nil, false, fmt.Errorf("%w: %w", serrors.ErrorUntrustedReusableWorkflow, err)
 	}
 
 	return trustedBuilderID, false, nil
diff --git a/verifiers/utils/dsse.go b/verifiers/utils/dsse.go
index 8ff226a6b..7c1c212bb 100644
--- a/verifiers/utils/dsse.go
+++ b/verifiers/utils/dsse.go
@@ -9,6 +9,7 @@ import (
 	"encoding/base64"
 	"encoding/json"
 	"encoding/pem"
+	"errors"
 	"fmt"
 	"math/big"
 
@@ -93,7 +94,7 @@ func DecodeSignature(s string) ([]byte, error) {
 	}
 	errs = append(errs, err)
 
-	return nil, fmt.Errorf("%w: %v", serrors.ErrorInvalidEncoding, errs)
+	return nil, fmt.Errorf("%w: %w", serrors.ErrorInvalidEncoding, errors.Join(errs...))
 }
 
 type SignatureEncoding int