diff --git a/chat.pb.go b/chat.pb.go
index efa76e8..b19c311 100644
--- a/chat.pb.go
+++ b/chat.pb.go
@@ -41,7 +41,7 @@ func (x MessageStateChange_NewState) String() string {
 	return proto.EnumName(MessageStateChange_NewState_name, int32(x))
 }
 func (MessageStateChange_NewState) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_chat_b5b0755f2470b837, []int{4, 0}
+	return fileDescriptor_chat_d513fb1f4b04c5fb, []int{4, 0}
 }
 
 type DoubleRatchetMsg struct {
@@ -58,7 +58,7 @@ func (m *DoubleRatchetMsg) Reset()         { *m = DoubleRatchetMsg{} }
 func (m *DoubleRatchetMsg) String() string { return proto.CompactTextString(m) }
 func (*DoubleRatchetMsg) ProtoMessage()    {}
 func (*DoubleRatchetMsg) Descriptor() ([]byte, []int) {
-	return fileDescriptor_chat_b5b0755f2470b837, []int{0}
+	return fileDescriptor_chat_d513fb1f4b04c5fb, []int{0}
 }
 func (m *DoubleRatchetMsg) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_DoubleRatchetMsg.Unmarshal(m, b)
@@ -125,7 +125,7 @@ func (m *PlainChatMessage) Reset()         { *m = PlainChatMessage{} }
 func (m *PlainChatMessage) String() string { return proto.CompactTextString(m) }
 func (*PlainChatMessage) ProtoMessage()    {}
 func (*PlainChatMessage) Descriptor() ([]byte, []int) {
-	return fileDescriptor_chat_b5b0755f2470b837, []int{1}
+	return fileDescriptor_chat_d513fb1f4b04c5fb, []int{1}
 }
 func (m *PlainChatMessage) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_PlainChatMessage.Unmarshal(m, b)
@@ -230,7 +230,7 @@ func (m *ChatMessage) Reset()         { *m = ChatMessage{} }
 func (m *ChatMessage) String() string { return proto.CompactTextString(m) }
 func (*ChatMessage) ProtoMessage()    {}
 func (*ChatMessage) Descriptor() ([]byte, []int) {
-	return fileDescriptor_chat_b5b0755f2470b837, []int{2}
+	return fileDescriptor_chat_d513fb1f4b04c5fb, []int{2}
 }
 func (m *ChatMessage) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ChatMessage.Unmarshal(m, b)
@@ -348,7 +348,7 @@ func (m *PreKey) Reset()         { *m = PreKey{} }
 func (m *PreKey) String() string { return proto.CompactTextString(m) }
 func (*PreKey) ProtoMessage()    {}
 func (*PreKey) Descriptor() ([]byte, []int) {
-	return fileDescriptor_chat_b5b0755f2470b837, []int{3}
+	return fileDescriptor_chat_d513fb1f4b04c5fb, []int{3}
 }
 func (m *PreKey) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_PreKey.Unmarshal(m, b)
@@ -410,7 +410,7 @@ func (m *MessageStateChange) Reset()         { *m = MessageStateChange{} }
 func (m *MessageStateChange) String() string { return proto.CompactTextString(m) }
 func (*MessageStateChange) ProtoMessage()    {}
 func (*MessageStateChange) Descriptor() ([]byte, []int) {
-	return fileDescriptor_chat_b5b0755f2470b837, []int{4}
+	return fileDescriptor_chat_d513fb1f4b04c5fb, []int{4}
 }
 func (m *MessageStateChange) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_MessageStateChange.Unmarshal(m, b)
@@ -472,7 +472,7 @@ func (m *BackendMessage) Reset()         { *m = BackendMessage{} }
 func (m *BackendMessage) String() string { return proto.CompactTextString(m) }
 func (*BackendMessage) ProtoMessage()    {}
 func (*BackendMessage) Descriptor() ([]byte, []int) {
-	return fileDescriptor_chat_b5b0755f2470b837, []int{5}
+	return fileDescriptor_chat_d513fb1f4b04c5fb, []int{5}
 }
 func (m *BackendMessage) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_BackendMessage.Unmarshal(m, b)
@@ -533,7 +533,7 @@ func (m *BackendMessage_Auth) Reset()         { *m = BackendMessage_Auth{} }
 func (m *BackendMessage_Auth) String() string { return proto.CompactTextString(m) }
 func (*BackendMessage_Auth) ProtoMessage()    {}
 func (*BackendMessage_Auth) Descriptor() ([]byte, []int) {
-	return fileDescriptor_chat_b5b0755f2470b837, []int{5, 0}
+	return fileDescriptor_chat_d513fb1f4b04c5fb, []int{5, 0}
 }
 func (m *BackendMessage_Auth) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_BackendMessage_Auth.Unmarshal(m, b)
@@ -581,6 +581,7 @@ type BackendMessage_Request struct {
 	NewOneTimePreKeys    uint32               `protobuf:"varint,4,opt,name=newOneTimePreKeys,proto3" json:"newOneTimePreKeys,omitempty"`
 	PreKeyBundle         []byte               `protobuf:"bytes,5,opt,name=preKeyBundle,proto3" json:"preKeyBundle,omitempty"`
 	Auth                 *BackendMessage_Auth `protobuf:"bytes,6,opt,name=auth,proto3" json:"auth,omitempty"`
+	NewSignedPreKey      *PreKey              `protobuf:"bytes,7,opt,name=newSignedPreKey,proto3" json:"newSignedPreKey,omitempty"`
 	XXX_NoUnkeyedLiteral struct{}             `json:"-"`
 	XXX_unrecognized     []byte               `json:"-"`
 	XXX_sizecache        int32                `json:"-"`
@@ -590,7 +591,7 @@ func (m *BackendMessage_Request) Reset()         { *m = BackendMessage_Request{}
 func (m *BackendMessage_Request) String() string { return proto.CompactTextString(m) }
 func (*BackendMessage_Request) ProtoMessage()    {}
 func (*BackendMessage_Request) Descriptor() ([]byte, []int) {
-	return fileDescriptor_chat_b5b0755f2470b837, []int{5, 1}
+	return fileDescriptor_chat_d513fb1f4b04c5fb, []int{5, 1}
 }
 func (m *BackendMessage_Request) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_BackendMessage_Request.Unmarshal(m, b)
@@ -652,6 +653,13 @@ func (m *BackendMessage_Request) GetAuth() *BackendMessage_Auth {
 	return nil
 }
 
+func (m *BackendMessage_Request) GetNewSignedPreKey() *PreKey {
+	if m != nil {
+		return m.NewSignedPreKey
+	}
+	return nil
+}
+
 type BackendMessage_Response struct {
 	PreKeyBundle         *BackendMessage_PreKeyBundle `protobuf:"bytes,1,opt,name=preKeyBundle,proto3" json:"preKeyBundle,omitempty"`
 	OneTimePrekeys       []*PreKey                    `protobuf:"bytes,2,rep,name=oneTimePrekeys,proto3" json:"oneTimePrekeys,omitempty"`
@@ -666,7 +674,7 @@ func (m *BackendMessage_Response) Reset()         { *m = BackendMessage_Response
 func (m *BackendMessage_Response) String() string { return proto.CompactTextString(m) }
 func (*BackendMessage_Response) ProtoMessage()    {}
 func (*BackendMessage_Response) Descriptor() ([]byte, []int) {
-	return fileDescriptor_chat_b5b0755f2470b837, []int{5, 2}
+	return fileDescriptor_chat_d513fb1f4b04c5fb, []int{5, 2}
 }
 func (m *BackendMessage_Response) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_BackendMessage_Response.Unmarshal(m, b)
@@ -727,7 +735,7 @@ func (m *BackendMessage_PreKeyBundle) Reset()         { *m = BackendMessage_PreK
 func (m *BackendMessage_PreKeyBundle) String() string { return proto.CompactTextString(m) }
 func (*BackendMessage_PreKeyBundle) ProtoMessage()    {}
 func (*BackendMessage_PreKeyBundle) Descriptor() ([]byte, []int) {
-	return fileDescriptor_chat_b5b0755f2470b837, []int{5, 3}
+	return fileDescriptor_chat_d513fb1f4b04c5fb, []int{5, 3}
 }
 func (m *BackendMessage_PreKeyBundle) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_BackendMessage_PreKeyBundle.Unmarshal(m, b)
@@ -782,66 +790,67 @@ func init() {
 	proto.RegisterEnum("pangea.MessageStateChange_NewState", MessageStateChange_NewState_name, MessageStateChange_NewState_value)
 }
 
-func init() { proto.RegisterFile("chat.proto", fileDescriptor_chat_b5b0755f2470b837) }
-
-var fileDescriptor_chat_b5b0755f2470b837 = []byte{
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+func init() { proto.RegisterFile("chat.proto", fileDescriptor_chat_d513fb1f4b04c5fb) }
+
+var fileDescriptor_chat_d513fb1f4b04c5fb = []byte{
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+	0xd4, 0x42, 0x03, 0x9f, 0x43, 0x2b, 0xfd, 0x4c, 0xdc, 0xa9, 0x79, 0xd8, 0x5a, 0xb9, 0xe2, 0x75,
+	0x0a, 0xac, 0x5d, 0xe3, 0xa5, 0xff, 0xdb, 0xf8, 0xb0, 0xa0, 0x4f, 0xf9, 0x60, 0xd7, 0x39, 0x4e,
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+	0x96, 0x9e, 0xd7, 0x30, 0x4b, 0xf2, 0x7b, 0xf5, 0xec, 0xff, 0xae, 0x87, 0x4f, 0x8b, 0x1f, 0xd2,
+	0xd2, 0xc1, 0x43, 0x79, 0xd2, 0x6d, 0x45, 0xff, 0x53, 0xf5, 0xd9, 0xbf, 0x01, 0x00, 0x00, 0xff,
+	0xff, 0x52, 0xce, 0x00, 0x1e, 0x78, 0x09, 0x00, 0x00,
 }
diff --git a/chat.proto b/chat.proto
index 7060a4e..ab7b6a0 100644
--- a/chat.proto
+++ b/chat.proto
@@ -75,6 +75,7 @@ message BackendMessage {
         uint32 newOneTimePreKeys = 4;
         bytes preKeyBundle = 5;
         Auth auth = 6;
+        PreKey newSignedPreKey = 7;
     }
 
     message Response {