diff --git a/client.pb.go b/client.pb.go
index a61cbfa..f80a0d6 100644
--- a/client.pb.go
+++ b/client.pb.go
@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.31.0
-// 	protoc        v4.23.4
+// 	protoc-gen-go v1.32.0
+// 	protoc        v5.26.1
 // source: client.proto
 
 package protocol
@@ -658,6 +658,7 @@ type Publication struct {
 	Info   *ClientInfo       `protobuf:"bytes,5,opt,name=info,proto3" json:"info,omitempty"`
 	Offset uint64            `protobuf:"varint,6,opt,name=offset,proto3" json:"offset,omitempty"`
 	Tags   map[string]string `protobuf:"bytes,7,rep,name=tags,proto3" json:"tags,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	Delta  bool              `protobuf:"varint,8,opt,name=delta,proto3" json:"delta,omitempty"` // When set indicates that data in Publication is a delta from previous data.
 }
 
 func (x *Publication) Reset() {
@@ -720,6 +721,13 @@ func (x *Publication) GetTags() map[string]string {
 	return nil
 }
 
+func (x *Publication) GetDelta() bool {
+	if x != nil {
+		return x.Delta
+	}
+	return false
+}
+
 type Join struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -1562,6 +1570,7 @@ type SubscribeRequest struct {
 	Positioned  bool   `protobuf:"varint,9,opt,name=positioned,proto3" json:"positioned,omitempty"`
 	Recoverable bool   `protobuf:"varint,10,opt,name=recoverable,proto3" json:"recoverable,omitempty"`
 	JoinLeave   bool   `protobuf:"varint,11,opt,name=join_leave,json=joinLeave,proto3" json:"join_leave,omitempty"`
+	Delta       string `protobuf:"bytes,12,opt,name=delta,proto3" json:"delta,omitempty"`
 }
 
 func (x *SubscribeRequest) Reset() {
@@ -1659,6 +1668,13 @@ func (x *SubscribeRequest) GetJoinLeave() bool {
 	return false
 }
 
+func (x *SubscribeRequest) GetDelta() string {
+	if x != nil {
+		return x.Delta
+	}
+	return ""
+}
+
 type SubscribeResult struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -1674,6 +1690,7 @@ type SubscribeResult struct {
 	Positioned    bool           `protobuf:"varint,10,opt,name=positioned,proto3" json:"positioned,omitempty"`
 	Data          Raw            `protobuf:"bytes,11,opt,name=data,proto3" json:"data,omitempty"`
 	WasRecovering bool           `protobuf:"varint,12,opt,name=was_recovering,json=wasRecovering,proto3" json:"was_recovering,omitempty"`
+	Delta         bool           `protobuf:"varint,13,opt,name=delta,proto3" json:"delta,omitempty"`
 }
 
 func (x *SubscribeResult) Reset() {
@@ -1778,6 +1795,13 @@ func (x *SubscribeResult) GetWasRecovering() bool {
 	return false
 }
 
+func (x *SubscribeResult) GetDelta() bool {
+	if x != nil {
+		return x.Delta
+	}
+	return false
+}
+
 type SubRefreshRequest struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -2863,7 +2887,7 @@ var file_client_proto_rawDesc = []byte{
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@@ -2876,241 +2900,245 @@ var file_client_proto_rawDesc = []byte{
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+	0x67, 0x52, 0x65, 0x73, 0x75, 0x6c, 0x74, 0x22, 0x38, 0x0a, 0x0a, 0x52, 0x50, 0x43, 0x52, 0x65,
+	0x71, 0x75, 0x65, 0x73, 0x74, 0x12, 0x12, 0x0a, 0x04, 0x64, 0x61, 0x74, 0x61, 0x18, 0x01, 0x20,
+	0x01, 0x28, 0x0c, 0x52, 0x04, 0x64, 0x61, 0x74, 0x61, 0x12, 0x16, 0x0a, 0x06, 0x6d, 0x65, 0x74,
+	0x68, 0x6f, 0x64, 0x18, 0x02, 0x20, 0x01, 0x28, 0x09, 0x52, 0x06, 0x6d, 0x65, 0x74, 0x68, 0x6f,
+	0x64, 0x22, 0x1f, 0x0a, 0x09, 0x52, 0x50, 0x43, 0x52, 0x65, 0x73, 0x75, 0x6c, 0x74, 0x12, 0x12,
+	0x0a, 0x04, 0x64, 0x61, 0x74, 0x61, 0x18, 0x01, 0x20, 0x01, 0x28, 0x0c, 0x52, 0x04, 0x64, 0x61,
+	0x74, 0x61, 0x22, 0x21, 0x0a, 0x0b, 0x53, 0x65, 0x6e, 0x64, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73,
+	0x74, 0x12, 0x12, 0x0a, 0x04, 0x64, 0x61, 0x74, 0x61, 0x18, 0x01, 0x20, 0x01, 0x28, 0x0c, 0x52,
+	0x04, 0x64, 0x61, 0x74, 0x61, 0x42, 0x0d, 0x5a, 0x0b, 0x2e, 0x2f, 0x3b, 0x70, 0x72, 0x6f, 0x74,
+	0x6f, 0x63, 0x6f, 0x6c, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
diff --git a/client.pb_easyjson.go b/client.pb_easyjson.go
index 80b3871..580aa7b 100644
--- a/client.pb_easyjson.go
+++ b/client.pb_easyjson.go
@@ -250,6 +250,8 @@ func easyjson19c08265DecodeGithubComCentrifugalProtocolBuild3(in *jlexer.Lexer,
 			}
 		case "was_recovering":
 			out.WasRecovering = bool(in.Bool())
+		case "delta":
+			out.Delta = bool(in.Bool())
 		default:
 			in.SkipRecursive()
 		}
@@ -373,6 +375,16 @@ func easyjson19c08265EncodeGithubComCentrifugalProtocolBuild3(out *writer, in Su
 		}
 		out.Bool(bool(in.WasRecovering))
 	}
+	if in.Delta {
+		const prefix string = ",\"delta\":"
+		if first {
+			first = false
+			out.RawString(prefix[1:])
+		} else {
+			out.RawString(prefix)
+		}
+		out.Bool(bool(in.Delta))
+	}
 	out.RawByte('}')
 }
 
@@ -424,6 +436,8 @@ func easyjson19c08265DecodeGithubComCentrifugalProtocolBuild4(in *jlexer.Lexer,
 			out.Recoverable = bool(in.Bool())
 		case "join_leave":
 			out.JoinLeave = bool(in.Bool())
+		case "delta":
+			out.Delta = string(in.String())
 		default:
 			in.SkipRecursive()
 		}
@@ -524,6 +538,16 @@ func easyjson19c08265EncodeGithubComCentrifugalProtocolBuild4(out *writer, in Su
 		}
 		out.Bool(bool(in.JoinLeave))
 	}
+	if in.Delta != "" {
+		const prefix string = ",\"delta\":"
+		if first {
+			first = false
+			out.RawString(prefix[1:])
+		} else {
+			out.RawString(prefix)
+		}
+		out.String(string(in.Delta))
+	}
 	out.RawByte('}')
 }
 
@@ -1931,6 +1955,8 @@ func easyjson19c08265DecodeGithubComCentrifugalProtocolBuild19(in *jlexer.Lexer,
 				}
 				in.Delim('}')
 			}
+		case "delta":
+			out.Delta = bool(in.Bool())
 		default:
 			in.SkipRecursive()
 		}
@@ -1995,6 +2021,16 @@ func easyjson19c08265EncodeGithubComCentrifugalProtocolBuild19(out *writer, in P
 			out.RawByte('}')
 		}
 	}
+	if in.Delta {
+		const prefix string = ",\"delta\":"
+		if first {
+			first = false
+			out.RawString(prefix[1:])
+		} else {
+			out.RawString(prefix)
+		}
+		out.Bool(bool(in.Delta))
+	}
 	out.RawByte('}')
 }
 
diff --git a/client.proto b/client.proto
index 48edefa..05f2c42 100644
--- a/client.proto
+++ b/client.proto
@@ -102,6 +102,7 @@ message Publication {
   ClientInfo info = 5;
   uint64 offset = 6;
   map<string, string> tags = 7;
+  bool delta = 8;  // When set indicates that data in Publication is a delta from previous data.
 }
 
 message Join {
@@ -198,6 +199,7 @@ message SubscribeRequest {
   bool positioned = 9;
   bool recoverable = 10;
   bool join_leave = 11;
+  string delta = 12;
 }
 
 message SubscribeResult {
@@ -212,6 +214,7 @@ message SubscribeResult {
   bool positioned = 10;
   bytes data = 11;
   bool was_recovering = 12;
+  bool delta = 13;
 }
 
 message SubRefreshRequest {
diff --git a/client_vtproto.pb.go b/client_vtproto.pb.go
index 0058074..05d0afb 100644
--- a/client_vtproto.pb.go
+++ b/client_vtproto.pb.go
@@ -674,6 +674,16 @@ func (m *Publication) MarshalToSizedBufferVT(dAtA []byte) (int, error) {
 		i -= len(m.unknownFields)
 		copy(dAtA[i:], m.unknownFields)
 	}
+	if m.Delta {
+		i--
+		if m.Delta {
+			dAtA[i] = 1
+		} else {
+			dAtA[i] = 0
+		}
+		i--
+		dAtA[i] = 0x40
+	}
 	if len(m.Tags) > 0 {
 		for k := range m.Tags {
 			v := m.Tags[k]
@@ -1519,6 +1529,13 @@ func (m *SubscribeRequest) MarshalToSizedBufferVT(dAtA []byte) (int, error) {
 		i -= len(m.unknownFields)
 		copy(dAtA[i:], m.unknownFields)
 	}
+	if len(m.Delta) > 0 {
+		i -= len(m.Delta)
+		copy(dAtA[i:], m.Delta)
+		i = encodeVarint(dAtA, i, uint64(len(m.Delta)))
+		i--
+		dAtA[i] = 0x62
+	}
 	if m.JoinLeave {
 		i--
 		if m.JoinLeave {
@@ -1625,6 +1642,16 @@ func (m *SubscribeResult) MarshalToSizedBufferVT(dAtA []byte) (int, error) {
 		i -= len(m.unknownFields)
 		copy(dAtA[i:], m.unknownFields)
 	}
+	if m.Delta {
+		i--
+		if m.Delta {
+			dAtA[i] = 1
+		} else {
+			dAtA[i] = 0
+		}
+		i--
+		dAtA[i] = 0x68
+	}
 	if m.WasRecovering {
 		i--
 		if m.WasRecovering {
@@ -2780,6 +2807,9 @@ func (m *Publication) SizeVT() (n int) {
 			n += mapEntrySize + 1 + sov(uint64(mapEntrySize))
 		}
 	}
+	if m.Delta {
+		n += 2
+	}
 	n += len(m.unknownFields)
 	return n
 }
@@ -3130,6 +3160,10 @@ func (m *SubscribeRequest) SizeVT() (n int) {
 	if m.JoinLeave {
 		n += 2
 	}
+	l = len(m.Delta)
+	if l > 0 {
+		n += 1 + l + sov(uint64(l))
+	}
 	n += len(m.unknownFields)
 	return n
 }
@@ -3175,6 +3209,9 @@ func (m *SubscribeResult) SizeVT() (n int) {
 	if m.WasRecovering {
 		n += 2
 	}
+	if m.Delta {
+		n += 2
+	}
 	n += len(m.unknownFields)
 	return n
 }
@@ -5614,6 +5651,26 @@ func (m *Publication) UnmarshalVT(dAtA []byte) error {
 			}
 			m.Tags[mapkey] = mapvalue
 			iNdEx = postIndex
+		case 8:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Delta", wireType)
+			}
+			var v int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflow
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				v |= int(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			m.Delta = bool(v != 0)
 		default:
 			iNdEx = preIndex
 			skippy, err := skip(dAtA[iNdEx:])
@@ -8030,6 +8087,38 @@ func (m *SubscribeRequest) UnmarshalVT(dAtA []byte) error {
 				}
 			}
 			m.JoinLeave = bool(v != 0)
+		case 12:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Delta", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflow
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				stringLen |= uint64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			intStringLen := int(stringLen)
+			if intStringLen < 0 {
+				return ErrInvalidLength
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex < 0 {
+				return ErrInvalidLength
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.Delta = string(dAtA[iNdEx:postIndex])
+			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skip(dAtA[iNdEx:])
@@ -8319,6 +8408,26 @@ func (m *SubscribeResult) UnmarshalVT(dAtA []byte) error {
 				}
 			}
 			m.WasRecovering = bool(v != 0)
+		case 13:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Delta", wireType)
+			}
+			var v int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflow
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				v |= int(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			m.Delta = bool(v != 0)
 		default:
 			iNdEx = preIndex
 			skippy, err := skip(dAtA[iNdEx:])
diff --git a/definitions/client.proto b/definitions/client.proto
index 48edefa..05f2c42 100644
--- a/definitions/client.proto
+++ b/definitions/client.proto
@@ -102,6 +102,7 @@ message Publication {
   ClientInfo info = 5;
   uint64 offset = 6;
   map<string, string> tags = 7;
+  bool delta = 8;  // When set indicates that data in Publication is a delta from previous data.
 }
 
 message Join {
@@ -198,6 +199,7 @@ message SubscribeRequest {
   bool positioned = 9;
   bool recoverable = 10;
   bool join_leave = 11;
+  string delta = 12;
 }
 
 message SubscribeResult {
@@ -212,6 +214,7 @@ message SubscribeResult {
   bool positioned = 10;
   bytes data = 11;
   bool was_recovering = 12;
+  bool delta = 13;
 }
 
 message SubRefreshRequest {