diff --git a/vendor/go.etcd.io/etcd/raft/log.go b/vendor/go.etcd.io/etcd/raft/log.go
index 03f83e6..77eedfc 100644
--- a/vendor/go.etcd.io/etcd/raft/log.go
+++ b/vendor/go.etcd.io/etcd/raft/log.go
@@ -332,8 +332,10 @@ func (l *raftLog) slice(lo, hi, maxSize uint64) ([]pb.Entry, error) {
 	if hi > l.unstable.offset {
 		unstable := l.unstable.slice(max(lo, l.unstable.offset), hi)
 		if len(ents) > 0 {
-			ents = append([]pb.Entry{}, ents...)
-			ents = append(ents, unstable...)
+			combined := make([]pb.Entry, len(ents)+len(unstable))
+			n := copy(combined, ents)
+			copy(combined[n:], unstable)
+			ents = combined
 		} else {
 			ents = unstable
 		}
diff --git a/vendor/go.etcd.io/etcd/raft/raft.go b/vendor/go.etcd.io/etcd/raft/raft.go
index 61ad12c..71c3749 100644
--- a/vendor/go.etcd.io/etcd/raft/raft.go
+++ b/vendor/go.etcd.io/etcd/raft/raft.go
@@ -607,14 +607,14 @@ func (r *raft) maybeCommit() bool {
 	if cap(r.matchBuf) < len(r.prs) {
 		r.matchBuf = make(uint64Slice, len(r.prs))
 	}
-	mis := r.matchBuf[:len(r.prs)]
+	r.matchBuf = r.matchBuf[:len(r.prs)]
 	idx := 0
 	for _, p := range r.prs {
-		mis[idx] = p.Match
+		r.matchBuf[idx] = p.Match
 		idx++
 	}
-	sort.Sort(mis)
-	mci := mis[len(mis)-r.quorum()]
+	sort.Sort(&r.matchBuf)
+	mci := r.matchBuf[len(r.matchBuf)-r.quorum()]
 	return r.raftLog.maybeCommit(mci, r.Term)
 }
 
@@ -1005,11 +1005,12 @@ func stepLeader(r *raft, m pb.Message) error {
 			return ErrProposalDropped
 		}
 
-		for i, e := range m.Entries {
+		for i := range m.Entries {
+			e := &m.Entries[i]
 			if e.Type == pb.EntryConfChange {
 				if r.pendingConfIndex > r.raftLog.applied {
 					r.logger.Infof("propose conf %s ignored since pending unapplied configuration [index %d, applied %d]",
-						e.String(), r.pendingConfIndex, r.raftLog.applied)
+						e, r.pendingConfIndex, r.raftLog.applied)
 					m.Entries[i] = pb.Entry{Type: pb.EntryNormal}
 				} else {
 					r.pendingConfIndex = r.raftLog.lastIndex() + uint64(i) + 1