diff --git a/network/peer/peer.go b/network/peer/peer.go
index 2b0f5788895b..4352e21a7af5 100644
--- a/network/peer/peer.go
+++ b/network/peer/peer.go
@@ -716,14 +716,6 @@ func (p *peer) shouldDisconnect() bool {
 		return false
 	}
 
-	if p.ip.BLSSignature == nil {
-		p.Log.Debug(disconnectingLog,
-			zap.String("reason", "missing BLS signature"),
-			zap.Stringer("nodeID", p.id),
-		)
-		return true
-	}
-
 	validSignature := bls.VerifyProofOfPossession(
 		vdr.PublicKey,
 		p.ip.BLSSignature,
@@ -1082,24 +1074,21 @@ func (p *peer) handleHandshake(msg *p2p.Handshake) {
 		return
 	}
 
-	// TODO: After v1.11.x is activated, require the key to be provided.
-	if len(msg.IpBlsSig) > 0 {
-		signature, err := bls.SignatureFromBytes(msg.IpBlsSig)
-		if err != nil {
-			p.Log.Debug(malformedMessageLog,
-				zap.Stringer("nodeID", p.id),
-				zap.Stringer("messageOp", message.HandshakeOp),
-				zap.String("field", "blsSignature"),
-				zap.Error(err),
-			)
-			p.StartClose()
-			return
-		}
-
-		p.ip.BLSSignature = signature
-		p.ip.BLSSignatureBytes = msg.IpBlsSig
+	signature, err := bls.SignatureFromBytes(msg.IpBlsSig)
+	if err != nil {
+		p.Log.Debug(malformedMessageLog,
+			zap.Stringer("nodeID", p.id),
+			zap.Stringer("messageOp", message.HandshakeOp),
+			zap.String("field", "blsSignature"),
+			zap.Error(err),
+		)
+		p.StartClose()
+		return
 	}
 
+	p.ip.BLSSignature = signature
+	p.ip.BLSSignatureBytes = msg.IpBlsSig
+
 	// If the peer is running an incompatible version or has an invalid BLS
 	// signature, disconnect from them prior to marking the handshake as
 	// completed.
@@ -1238,8 +1227,8 @@ func (p *peer) handlePeerList(msg *p2p.PeerList) {
 				zap.String("field", "port"),
 				zap.Uint32("port", claimedIPPort.IpPort),
 			)
-			// TODO: After v1.11.x is activated, close the peer here.
-			continue
+			p.StartClose()
+			return
 		}
 
 		discoveredIPs[i] = ips.NewClaimedIPPort(
diff --git a/proto/pb/sdk/sdk.pb.go b/proto/pb/sdk/sdk.pb.go
index ca0904ffcb0c..d6f458984a80 100644
--- a/proto/pb/sdk/sdk.pb.go
+++ b/proto/pb/sdk/sdk.pb.go
@@ -173,20 +173,20 @@ var File_sdk_sdk_proto protoreflect.FileDescriptor
 
 var file_sdk_sdk_proto_rawDesc = []byte{
 	0x0a, 0x0d, 0x73, 0x64, 0x6b, 0x2f, 0x73, 0x64, 0x6b, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12,
-	0x03, 0x73, 0x64, 0x6b, 0x22, 0x45, 0x0a, 0x11, 0x50, 0x75, 0x6c, 0x6c, 0x47, 0x6f, 0x73, 0x73,
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-	0x68, 0x47, 0x6f, 0x73, 0x73, 0x69, 0x70, 0x12, 0x16, 0x0a, 0x06, 0x67, 0x6f, 0x73, 0x73, 0x69,
-	0x70, 0x18, 0x01, 0x20, 0x03, 0x28, 0x0c, 0x52, 0x06, 0x67, 0x6f, 0x73, 0x73, 0x69, 0x70, 0x42,
-	0x2e, 0x5a, 0x2c, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x61, 0x76,
-	0x61, 0x2d, 0x6c, 0x61, 0x62, 0x73, 0x2f, 0x61, 0x76, 0x61, 0x6c, 0x61, 0x6e, 0x63, 0x68, 0x65,
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-	0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
+	0x69, 0x6c, 0x74, 0x65, 0x72, 0x22, 0x2c, 0x0a, 0x12, 0x50, 0x75, 0x6c, 0x6c, 0x47, 0x6f, 0x73,
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+	0x6f, 0x73, 0x73, 0x69, 0x70, 0x18, 0x01, 0x20, 0x03, 0x28, 0x0c, 0x52, 0x06, 0x67, 0x6f, 0x73,
+	0x73, 0x69, 0x70, 0x22, 0x24, 0x0a, 0x0a, 0x50, 0x75, 0x73, 0x68, 0x47, 0x6f, 0x73, 0x73, 0x69,
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+	0x0c, 0x52, 0x06, 0x67, 0x6f, 0x73, 0x73, 0x69, 0x70, 0x42, 0x2e, 0x5a, 0x2c, 0x67, 0x69, 0x74,
+	0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x61, 0x76, 0x61, 0x2d, 0x6c, 0x61, 0x62, 0x73,
+	0x2f, 0x61, 0x76, 0x61, 0x6c, 0x61, 0x6e, 0x63, 0x68, 0x65, 0x67, 0x6f, 0x2f, 0x70, 0x72, 0x6f,
+	0x74, 0x6f, 0x2f, 0x70, 0x62, 0x2f, 0x73, 0x64, 0x6b, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f,
+	0x33,
 }
 
 var (
diff --git a/proto/sdk/sdk.proto b/proto/sdk/sdk.proto
index f42912391fe7..3f91f23efdfe 100644
--- a/proto/sdk/sdk.proto
+++ b/proto/sdk/sdk.proto
@@ -5,8 +5,6 @@ package sdk;
 option go_package = "github.com/ava-labs/avalanchego/proto/pb/sdk";
 
 message PullGossipRequest {
-  // TODO: Remove reservation after v1.11.x activates.
-  reserved 1;
   bytes salt = 2;
   bytes filter = 3;
 }