diff --git a/p2pool/stratum/server.go b/p2pool/stratum/server.go
index dbc436c..02afd47 100644
--- a/p2pool/stratum/server.go
+++ b/p2pool/stratum/server.go
@@ -190,6 +190,10 @@ func (s *Server) fillNewTemplateData(currentDifficulty types.Difficulty) error {
 	if s.newTemplateData.ShareVersion < sidechain.ShareVersion_V2 {
 		return errors.New("unsupported sidechain version")
 	}
+	// no merge mining nor merkle proof support yet
+	if s.newTemplateData.ShareVersion > sidechain.ShareVersion_V2 {
+		return errors.New("unsupported sidechain version")
+	}
 
 	if s.tip != nil {
 		s.newTemplateData.PreviousTemplateId = s.tip.SideTemplateId(s.sidechain.Consensus())
diff --git a/p2pool/stratum/template.go b/p2pool/stratum/template.go
index 5cd2733..36c8502 100644
--- a/p2pool/stratum/template.go
+++ b/p2pool/stratum/template.go
@@ -216,7 +216,7 @@ func (tpl *Template) HashingBlob(hasher *sha3.HasherState, preAllocatedBuffer []
 }
 
 func TemplateFromPoolBlock(b *sidechain.PoolBlock) (tpl *Template, err error) {
-	if b.ShareVersion() != sidechain.ShareVersion_V2 {
+	if b.ShareVersion() < sidechain.ShareVersion_V1 || b.ShareVersion() > sidechain.ShareVersion_V2 {
 		return nil, errors.New("unsupported share version")
 	}
 	totalLen := b.BufferLength()