diff --git a/_vendor/src/github.com/coreos/etcd b/_vendor/src/github.com/coreos/etcd
index 7bf87e2b09b3..91d2a9ec87ea 160000
--- a/_vendor/src/github.com/coreos/etcd
+++ b/_vendor/src/github.com/coreos/etcd
@@ -1 +1 @@
-Subproject commit 7bf87e2b09b3225900eb227bd33e8de93f7a270b
+Subproject commit 91d2a9ec87ead03c1bd6666dc527029137a58f26
diff --git a/multiraft/storage.go b/multiraft/storage.go
index 45c74cad5cdf..75b03c077b78 100644
--- a/multiraft/storage.go
+++ b/multiraft/storage.go
@@ -29,7 +29,7 @@ import (
 // It is implemented by *raft.MemoryStorage.
 type WriteableGroupStorage interface {
 	raft.Storage
-	Append(entries []raftpb.Entry)
+	Append(entries []raftpb.Entry) error
 	SetHardState(st raftpb.HardState) error
 }
 
diff --git a/multiraft/storage_test.go b/multiraft/storage_test.go
index d1c3614cd26f..b567d7fb7e25 100644
--- a/multiraft/storage_test.go
+++ b/multiraft/storage_test.go
@@ -50,9 +50,9 @@ type blockableGroupStorage struct {
 	s WriteableGroupStorage
 }
 
-func (b *blockableGroupStorage) Append(entries []raftpb.Entry) {
+func (b *blockableGroupStorage) Append(entries []raftpb.Entry) error {
 	b.b.wait()
-	b.s.Append(entries)
+	return b.s.Append(entries)
 }
 
 func (b *blockableGroupStorage) SetHardState(st raftpb.HardState) error {