diff --git a/pubsub.go b/pubsub.go
index 8b4a8a7..1a85642 100644
--- a/pubsub.go
+++ b/pubsub.go
@@ -288,6 +288,12 @@ func (p *PubSub) processLoop(ctx context.Context) {
 				continue
 			}
 
+			_, ok = p.blacklist[pid]
+			if ok {
+				log.Warning("ignoring connection from blacklisted peer: ", pid)
+				continue
+			}
+
 			messages := make(chan *RPC, 32)
 			messages <- p.getHelloPacket()
 			go p.handleNewPeer(ctx, pid, messages)
@@ -296,13 +302,21 @@ func (p *PubSub) processLoop(ctx context.Context) {
 		case s := <-p.newPeerStream:
 			pid := s.Conn().RemotePeer()
 
-			_, ok := p.peers[pid]
+			ch, ok := p.peers[pid]
 			if !ok {
 				log.Warning("new stream for unknown peer: ", pid)
 				s.Reset()
 				continue
 			}
 
+			_, ok = p.blacklist[pid]
+			if ok {
+				log.Warning("closing stream for blacklisted peer: ", pid)
+				close(ch)
+				s.Reset()
+				continue
+			}
+
 			p.rt.AddPeer(pid, s.Protocol())
 
 		case pid := <-p.newPeerError:
@@ -384,6 +398,16 @@ func (p *PubSub) processLoop(ctx context.Context) {
 			log.Infof("Blacklisting peer %s", pid)
 			p.blacklist[pid] = struct{}{}
 
+			ch, ok := p.peers[pid]
+			if ok {
+				close(ch)
+				delete(p.peers, pid)
+				for _, t := range p.topics {
+					delete(t, pid)
+				}
+				p.rt.RemovePeer(pid)
+			}
+
 		case <-ctx.Done():
 			log.Info("pubsub processloop shutting down")
 			return