diff --git a/proto/spire/api/server/localauthority/v1/localauthority.pb.go b/proto/spire/api/server/localauthority/v1/localauthority.pb.go
index fc01f99..e6d223e 100644
--- a/proto/spire/api/server/localauthority/v1/localauthority.pb.go
+++ b/proto/spire/api/server/localauthority/v1/localauthority.pb.go
@@ -894,8 +894,9 @@ type TaintX509UpstreamAuthorityRequest struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	// The upstream authority's public key, PKIX encoded
-	PublicKey []byte `protobuf:"bytes,1,opt,name=public_key,json=publicKey,proto3" json:"public_key,omitempty"`
+	// This is the X.509 Subject Key Identifier (or SKID) of the
+	// authority's CA certificate of the upstream X.509 authority to taint.
+	SubjectKeyId string `protobuf:"bytes,1,opt,name=subject_key_id,json=subjectKeyId,proto3" json:"subject_key_id,omitempty"`
 }
 
 func (x *TaintX509UpstreamAuthorityRequest) Reset() {
@@ -930,11 +931,11 @@ func (*TaintX509UpstreamAuthorityRequest) Descriptor() ([]byte, []int) {
 	return file_spire_api_server_localauthority_v1_localauthority_proto_rawDescGZIP(), []int{18}
 }
 
-func (x *TaintX509UpstreamAuthorityRequest) GetPublicKey() []byte {
+func (x *TaintX509UpstreamAuthorityRequest) GetSubjectKeyId() string {
 	if x != nil {
-		return x.PublicKey
+		return x.SubjectKeyId
 	}
-	return nil
+	return ""
 }
 
 type TaintX509UpstreamAuthorityResponse struct {
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 }
 
 var (
diff --git a/proto/spire/api/server/localauthority/v1/localauthority.proto b/proto/spire/api/server/localauthority/v1/localauthority.proto
index 257bb9d..f9c76bd 100644
--- a/proto/spire/api/server/localauthority/v1/localauthority.proto
+++ b/proto/spire/api/server/localauthority/v1/localauthority.proto
@@ -80,7 +80,7 @@ service LocalAuthority {
 	// It is important to change active upstream authority before taiting it, 
 	// since taint will force the rotation of any bundle that is using 
 	// the old upstream authority.
-        // It can receive the public key of an old X.509 authority.
+        // It receive the X.509 Subject Key Identifier (or SKID) of an old X.509 authority.
         //
         // If a X.509 upstream authority does not exist or it is active, a FailedPrecondition
         // error will be returned.
@@ -197,8 +197,9 @@ message TaintX509AuthorityResponse {
 }
 
 message TaintX509UpstreamAuthorityRequest {
-        // The upstream authority's public key, PKIX encoded
-        bytes public_key = 1;
+        // This is the X.509 Subject Key Identifier (or SKID) of the
+        // authority's CA certificate of the upstream X.509 authority to taint.
+        string subject_key_id = 1;
 }
 
 message TaintX509UpstreamAuthorityResponse {
diff --git a/proto/spire/api/server/localauthority/v1/localauthority_grpc.pb.go b/proto/spire/api/server/localauthority/v1/localauthority_grpc.pb.go
index 7f84574..8d7a9f1 100644
--- a/proto/spire/api/server/localauthority/v1/localauthority_grpc.pb.go
+++ b/proto/spire/api/server/localauthority/v1/localauthority_grpc.pb.go
@@ -83,7 +83,7 @@ type LocalAuthorityClient interface {
 	// It is important to change active upstream authority before taiting it,
 	// since taint will force the rotation of any bundle that is using
 	// the old upstream authority.
-	// It can receive the public key of an old X.509 authority.
+	// It receive the X.509 Subject Key Identifier (or SKID) of an old X.509 authority.
 	//
 	// If a X.509 upstream authority does not exist or it is active, a FailedPrecondition
 	// error will be returned.
@@ -276,7 +276,7 @@ type LocalAuthorityServer interface {
 	// It is important to change active upstream authority before taiting it,
 	// since taint will force the rotation of any bundle that is using
 	// the old upstream authority.
-	// It can receive the public key of an old X.509 authority.
+	// It receive the X.509 Subject Key Identifier (or SKID) of an old X.509 authority.
 	//
 	// If a X.509 upstream authority does not exist or it is active, a FailedPrecondition
 	// error will be returned.