diff --git a/modules/core/04-channel/types/channel.pb.go b/modules/core/04-channel/types/channel.pb.go
index 636f44c2bf1..2263ee69c4e 100644
--- a/modules/core/04-channel/types/channel.pb.go
+++ b/modules/core/04-channel/types/channel.pb.go
@@ -108,41 +108,6 @@ func (Order) EnumDescriptor() ([]byte, []int) {
 	return fileDescriptor_c3a07336710636a0, []int{1}
 }
 
-// IBCVersion defines the version that the IBC packet intends to use.
-// This allows asynchronous upgrades over time as unsupported IBC Versions
-// will simply be rejected by the receiver and timed out on sender.
-type IBCVersion int32
-
-const (
-	// zero-value for IBC version.
-	// This will be treated as a classic packet
-	IBC_VERSION_UNSPECIFIED IBCVersion = 0
-	// IBC version 1 implements the Classic protocol
-	IBC_VERSION_1 IBCVersion = 1
-	// IBC version 2 implements the Eureka protocol
-	IBC_VERSION_2 IBCVersion = 2
-)
-
-var IBCVersion_name = map[int32]string{
-	0: "IBC_VERSION_UNSPECIFIED",
-	1: "IBC_VERSION_1",
-	2: "IBC_VERSION_2",
-}
-
-var IBCVersion_value = map[string]int32{
-	"IBC_VERSION_UNSPECIFIED": 0,
-	"IBC_VERSION_1":           1,
-	"IBC_VERSION_2":           2,
-}
-
-func (x IBCVersion) String() string {
-	return proto.EnumName(IBCVersion_name, int32(x))
-}
-
-func (IBCVersion) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_c3a07336710636a0, []int{2}
-}
-
 // Channel defines pipeline for exactly-once packet delivery between specific
 // modules on separate blockchains, which has at least one end capable of
 // sending packets and one end capable of receiving packets.
@@ -313,12 +278,6 @@ type Packet struct {
 	TimeoutHeight types.Height `protobuf:"bytes,7,opt,name=timeout_height,json=timeoutHeight,proto3" json:"timeout_height"`
 	// block timestamp (in nanoseconds) after which the packet times out
 	TimeoutTimestamp uint64 `protobuf:"varint,8,opt,name=timeout_timestamp,json=timeoutTimestamp,proto3" json:"timeout_timestamp,omitempty"`
-	// which IBC version to use to commit this packet
-	ProtocolVersion IBCVersion `protobuf:"varint,9,opt,name=protocol_version,json=protocolVersion,proto3,enum=ibc.core.channel.v1.IBCVersion" json:"protocol_version,omitempty"`
-	// version which application should use to process the packet data
-	AppVersion string `protobuf:"bytes,10,opt,name=app_version,json=appVersion,proto3" json:"app_version,omitempty"`
-	// encoding to be used TODO clearer message
-	Encoding string `protobuf:"bytes,11,opt,name=encoding,proto3" json:"encoding,omitempty"`
 }
 
 func (m *Packet) Reset()         { *m = Packet{} }
@@ -647,7 +606,6 @@ func (m *Params) GetUpgradeTimeout() Timeout {
 func init() {
 	proto.RegisterEnum("ibc.core.channel.v1.State", State_name, State_value)
 	proto.RegisterEnum("ibc.core.channel.v1.Order", Order_name, Order_value)
-	proto.RegisterEnum("ibc.core.channel.v1.IBCVersion", IBCVersion_name, IBCVersion_value)
 	proto.RegisterType((*Channel)(nil), "ibc.core.channel.v1.Channel")
 	proto.RegisterType((*IdentifiedChannel)(nil), "ibc.core.channel.v1.IdentifiedChannel")
 	proto.RegisterType((*Counterparty)(nil), "ibc.core.channel.v1.Counterparty")
@@ -662,71 +620,66 @@ func init() {
 func init() { proto.RegisterFile("ibc/core/channel/v1/channel.proto", fileDescriptor_c3a07336710636a0) }
 
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+	0x96, 0xbd, 0x5b, 0x6b, 0x89, 0x5b, 0x96, 0x37, 0x2d, 0x0b, 0x71, 0x17, 0xb2, 0x5c, 0xdc, 0x74,
+	0xff, 0x0d, 0x65, 0xa1, 0xd2, 0x81, 0xc2, 0x85, 0xf3, 0xca, 0x27, 0xaf, 0xa7, 0xd8, 0x1d, 0xe3,
+	0x19, 0xf6, 0x29, 0x52, 0x21, 0x1d, 0xe0, 0x70, 0x31, 0xa5, 0xea, 0xff, 0xa3, 0xa2, 0x9a, 0x09,
+	0x4b, 0xd8, 0xe8, 0x04, 0x52, 0x38, 0x08, 0x48, 0xa0, 0x9e, 0x44, 0x42, 0xcd, 0x84, 0xc5, 0xcd,
+	0x4b, 0x80, 0x6c, 0x80, 0xc3, 0x39, 0xf1, 0x43, 0x5c, 0xb6, 0x21, 0xd3, 0xe7, 0xd3, 0x44, 0x5f,
+	0x43, 0x5a, 0xac, 0x4c, 0xfa, 0x9b, 0x2b, 0x13, 0x7c, 0x74, 0x0a, 0xb9, 0xcd, 0x8e, 0x92, 0xac,
+	0xf0, 0x0d, 0x50, 0x1e, 0x44, 0x17, 0x3e, 0xb0, 0x67, 0x21, 0x7a, 0x01, 0xf1, 0x5f, 0x6c, 0x28,
+	0x56, 0x28, 0xa4, 0x4e, 0xef, 0x7c, 0x45, 0x44, 0x61, 0x42, 0x2c, 0x2f, 0x42, 0x05, 0x7a, 0xf6,
+	0x53, 0x12, 0x52, 0x3d, 0xf1, 0xa2, 0x95, 0x7a, 0xfd, 0x8b, 0xbe, 0x31, 0x1c, 0xb4, 0xcd, 0xb6,
+	0xd9, 0x37, 0x2f, 0x5a, 0xe6, 0x4b, 0xa3, 0x31, 0x1c, 0xb4, 0x7b, 0x5d, 0xa3, 0x6e, 0x3e, 0x33,
+	0x8d, 0x86, 0x92, 0xd0, 0x8e, 0x56, 0x6b, 0xfd, 0x70, 0x87, 0x80, 0x54, 0x00, 0x1e, 0x17, 0x81,
+	0x8a, 0xa4, 0x65, 0x57, 0x6b, 0x5d, 0x8e, 0xce, 0xa8, 0x08, 0x87, 0xdc, 0xd3, 0xb7, 0xbe, 0xeb,
+	0x74, 0x8d, 0xb6, 0x92, 0xd4, 0xf6, 0x57, 0x6b, 0x3d, 0x23, 0xcc, 0x4d, 0x24, 0x73, 0xee, 0xf1,
+	0x48, 0xe6, 0x39, 0x85, 0x03, 0xee, 0xa9, 0xb7, 0x3a, 0x3d, 0xa3, 0xa1, 0xc8, 0x1a, 0xac, 0xd6,
+	0x7a, 0x9a, 0x5b, 0x48, 0x87, 0x3c, 0xf7, 0x3e, 0x6b, 0x0d, 0x7a, 0x4d, 0xb3, 0xfd, 0x5c, 0x49,
+	0x69, 0x07, 0xab, 0xb5, 0x9e, 0x8d, 0x6d, 0x74, 0x06, 0xc7, 0x5b, 0x8c, 0x7a, 0xe7, 0xdb, 0x6e,
+	0xcb, 0xe8, 0x1b, 0x4a, 0x9a, 0xd7, 0xbf, 0x03, 0x6a, 0xf2, 0xdb, 0x5f, 0x8b, 0x89, 0xb3, 0xd7,
+	0x90, 0x62, 0x4f, 0x35, 0xfa, 0x04, 0x4e, 0x3a, 0x56, 0xc3, 0xb0, 0x86, 0xed, 0x4e, 0xdb, 0xb8,
+	0xd5, 0x3d, 0x2b, 0x30, 0xc2, 0x51, 0x19, 0x0a, 0x9c, 0x35, 0x68, 0xb3, 0x5f, 0xa3, 0xa1, 0x48,
+	0xda, 0xe1, 0x6a, 0xad, 0xe7, 0x6e, 0x80, 0xa8, 0x7d, 0xce, 0x89, 0x19, 0xa2, 0x7d, 0x61, 0x72,
+	0xe1, 0xcb, 0xde, 0xbb, 0xab, 0xa2, 0xf4, 0xfe, 0xaa, 0x28, 0xfd, 0x71, 0x55, 0x94, 0x7e, 0xbe,
+	0x2e, 0x26, 0xde, 0x5f, 0x17, 0x13, 0x1f, 0xae, 0x8b, 0x89, 0x97, 0x4f, 0xc7, 0x1e, 0x9d, 0x2c,
+	0x46, 0x55, 0x87, 0xcc, 0x6a, 0x0e, 0x09, 0x67, 0x24, 0xac, 0x79, 0x23, 0xe7, 0xd1, 0x98, 0xd4,
+	0x96, 0x4f, 0x6b, 0x33, 0xe2, 0x2e, 0xa6, 0x38, 0xe4, 0x9f, 0x08, 0x8f, 0xbf, 0x7c, 0x14, 0x7f,
+	0x73, 0xd0, 0x37, 0x73, 0x1c, 0x8e, 0xd2, 0xec, 0x1b, 0xe1, 0x8b, 0xbf, 0x02, 0x00, 0x00, 0xff,
+	0xff, 0x39, 0xda, 0x3d, 0x84, 0x94, 0x08, 0x00, 0x00,
 }
 
 func (m *Channel) Marshal() (dAtA []byte, err error) {
@@ -928,25 +881,6 @@ func (m *Packet) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	_ = i
 	var l int
 	_ = l
-	if len(m.Encoding) > 0 {
-		i -= len(m.Encoding)
-		copy(dAtA[i:], m.Encoding)
-		i = encodeVarintChannel(dAtA, i, uint64(len(m.Encoding)))
-		i--
-		dAtA[i] = 0x5a
-	}
-	if len(m.AppVersion) > 0 {
-		i -= len(m.AppVersion)
-		copy(dAtA[i:], m.AppVersion)
-		i = encodeVarintChannel(dAtA, i, uint64(len(m.AppVersion)))
-		i--
-		dAtA[i] = 0x52
-	}
-	if m.ProtocolVersion != 0 {
-		i = encodeVarintChannel(dAtA, i, uint64(m.ProtocolVersion))
-		i--
-		dAtA[i] = 0x48
-	}
 	if m.TimeoutTimestamp != 0 {
 		i = encodeVarintChannel(dAtA, i, uint64(m.TimeoutTimestamp))
 		i--
@@ -1363,17 +1297,6 @@ func (m *Packet) Size() (n int) {
 	if m.TimeoutTimestamp != 0 {
 		n += 1 + sovChannel(uint64(m.TimeoutTimestamp))
 	}
-	if m.ProtocolVersion != 0 {
-		n += 1 + sovChannel(uint64(m.ProtocolVersion))
-	}
-	l = len(m.AppVersion)
-	if l > 0 {
-		n += 1 + l + sovChannel(uint64(l))
-	}
-	l = len(m.Encoding)
-	if l > 0 {
-		n += 1 + l + sovChannel(uint64(l))
-	}
 	return n
 }
 
@@ -2334,89 +2257,6 @@ func (m *Packet) Unmarshal(dAtA []byte) error {
 					break
 				}
 			}
-		case 9:
-			if wireType != 0 {
-				return fmt.Errorf("proto: wrong wireType = %d for field ProtocolVersion", wireType)
-			}
-			m.ProtocolVersion = 0
-			for shift := uint(0); ; shift += 7 {
-				if shift >= 64 {
-					return ErrIntOverflowChannel
-				}
-				if iNdEx >= l {
-					return io.ErrUnexpectedEOF
-				}
-				b := dAtA[iNdEx]
-				iNdEx++
-				m.ProtocolVersion |= IBCVersion(b&0x7F) << shift
-				if b < 0x80 {
-					break
-				}
-			}
-		case 10:
-			if wireType != 2 {
-				return fmt.Errorf("proto: wrong wireType = %d for field AppVersion", wireType)
-			}
-			var stringLen uint64
-			for shift := uint(0); ; shift += 7 {
-				if shift >= 64 {
-					return ErrIntOverflowChannel
-				}
-				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 ErrInvalidLengthChannel
-			}
-			postIndex := iNdEx + intStringLen
-			if postIndex < 0 {
-				return ErrInvalidLengthChannel
-			}
-			if postIndex > l {
-				return io.ErrUnexpectedEOF
-			}
-			m.AppVersion = string(dAtA[iNdEx:postIndex])
-			iNdEx = postIndex
-		case 11:
-			if wireType != 2 {
-				return fmt.Errorf("proto: wrong wireType = %d for field Encoding", wireType)
-			}
-			var stringLen uint64
-			for shift := uint(0); ; shift += 7 {
-				if shift >= 64 {
-					return ErrIntOverflowChannel
-				}
-				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 ErrInvalidLengthChannel
-			}
-			postIndex := iNdEx + intStringLen
-			if postIndex < 0 {
-				return ErrInvalidLengthChannel
-			}
-			if postIndex > l {
-				return io.ErrUnexpectedEOF
-			}
-			m.Encoding = string(dAtA[iNdEx:postIndex])
-			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipChannel(dAtA[iNdEx:])
diff --git a/modules/core/04-channel/types/msgs_test.go b/modules/core/04-channel/types/msgs_test.go
index 173131d73df..e660cf39bd4 100644
--- a/modules/core/04-channel/types/msgs_test.go
+++ b/modules/core/04-channel/types/msgs_test.go
@@ -64,7 +64,6 @@ var (
 	disabledTimeout   = clienttypes.ZeroHeight()
 	validPacketData   = []byte("testdata")
 	unknownPacketData = []byte("unknown")
-	validVersion      = "ics-20"
 
 	packet        = types.NewPacket(validPacketData, 1, portid, chanid, cpportid, cpchanid, timeoutHeight, timeoutTimestamp)
 	invalidPacket = types.NewPacket(unknownPacketData, 0, portid, chanid, cpportid, cpchanid, timeoutHeight, timeoutTimestamp)
diff --git a/modules/core/04-channel/types/packet.go b/modules/core/04-channel/types/packet.go
index 71ff5bd62e9..b585f093e50 100644
--- a/modules/core/04-channel/types/packet.go
+++ b/modules/core/04-channel/types/packet.go
@@ -2,8 +2,6 @@ package types
 
 import (
 	"crypto/sha256"
-	"slices"
-	"strings"
 
 	errorsmod "cosmossdk.io/errors"
 
@@ -14,32 +12,13 @@ import (
 	"github.com/cosmos/ibc-go/v9/modules/core/exported"
 )
 
-// CommitPacket returns the packet commitment bytes based on
-// the ProtocolVersion specified in the Packet. The commitment
-// must commit to all fields in the packet apart from the source port
-// source channel and sequence (which will be committed to in the packet commitment key path)
-// and the ProtocolVersion which is defining how to hash the packet fields.
-// NOTE: The commitment MUST be a fixed length preimage to prevent relayers from being able
-// to malleate the packet fields and create a commitment hash that matches the original packet.
-func CommitPacket(packet Packet) []byte {
-	switch packet.ProtocolVersion {
-	case IBC_VERSION_UNSPECIFIED, IBC_VERSION_1:
-		return commitV1Packet(packet)
-	case IBC_VERSION_2:
-		// TODO: convert to PacketV2 and commit.
-		return commitV2Packet(packet)
-	default:
-		panic("unsupported version")
-	}
-}
-
-// commitV1Packet returns the V1 packet commitment bytes. The commitment consists of:
+// CommitPacket returns the packet commitment bytes. The commitment consists of:
 // sha256_hash(timeout_timestamp + timeout_height.RevisionNumber + timeout_height.RevisionHeight + sha256_hash(data))
 // from a given packet. This results in a fixed length preimage.
 // NOTE: A fixed length preimage is ESSENTIAL to prevent relayers from being able
 // to malleate the packet fields and create a commitment hash that matches the original packet.
 // NOTE: sdk.Uint64ToBigEndian sets the uint64 to a slice of length 8.
-func commitV1Packet(packet Packet) []byte {
+func CommitPacket(packet Packet) []byte {
 	timeoutHeight := packet.GetTimeoutHeight()
 
 	buf := sdk.Uint64ToBigEndian(packet.GetTimeoutTimestamp())
@@ -57,50 +36,6 @@ func commitV1Packet(packet Packet) []byte {
 	return hash[:]
 }
 
-// commitV2Packet returns the V2 packet commitment bytes. The commitment consists of:
-// sha256_hash(timeout_timestamp + timeout_height.RevisionNumber + timeout_height.RevisionHeight)
-// + sha256_hash(destPort) + sha256_hash(destChannel) + sha256_hash(version) + sha256_hash(data))
-// from a given packet. This results in a fixed length preimage.
-// NOTE: A fixed length preimage is ESSENTIAL to prevent relayers from being able
-// to malleate the packet fields and create a commitment hash that matches the original packet.
-// NOTE: sdk.Uint64ToBigEndian sets the uint64 to a slice of length 8.
-func commitV2Packet(packet Packet) []byte {
-	timeoutHeight := packet.GetTimeoutHeight()
-
-	timeoutBuf := sdk.Uint64ToBigEndian(packet.GetTimeoutTimestamp())
-
-	// only hash the timeout height if it is non-zero. This will allow us to remove it entirely in the future
-	if !timeoutHeight.EQ(clienttypes.ZeroHeight()) {
-		revisionNumber := sdk.Uint64ToBigEndian(timeoutHeight.GetRevisionNumber())
-		timeoutBuf = append(timeoutBuf, revisionNumber...)
-
-		revisionHeight := sdk.Uint64ToBigEndian(timeoutHeight.GetRevisionHeight())
-		timeoutBuf = append(timeoutBuf, revisionHeight...)
-	}
-
-	// hash the timeout rather than using a fixed-size preimage directly
-	// this will allow more flexibility in the future with how timeouts are defined
-	timeoutHash := sha256.Sum256(timeoutBuf)
-	buf := timeoutHash[:]
-
-	// hash the destination identifiers since we can no longer retrieve them from the channelEnd
-	portHash := sha256.Sum256([]byte(packet.GetDestPort()))
-	buf = append(buf, portHash[:]...)
-	destinationHash := sha256.Sum256([]byte(packet.GetDestChannel()))
-	buf = append(buf, destinationHash[:]...)
-
-	// hash the app version.
-	versionHash := sha256.Sum256([]byte(packet.AppVersion))
-	buf = append(buf, versionHash[:]...)
-
-	// hash the data
-	dataHash := sha256.Sum256(packet.GetData())
-	buf = append(buf, dataHash[:]...)
-
-	hash := sha256.Sum256(buf)
-	return hash[:]
-}
-
 // CommitAcknowledgement returns the hash of commitment bytes
 func CommitAcknowledgement(data []byte) []byte {
 	hash := sha256.Sum256(data)
@@ -124,29 +59,6 @@ func NewPacket(
 		DestinationChannel: destinationChannel,
 		TimeoutHeight:      timeoutHeight,
 		TimeoutTimestamp:   timeoutTimestamp,
-		ProtocolVersion:    IBC_VERSION_1,
-		Encoding:           "json",
-	}
-}
-
-func NewPacketWithVersion(
-	data []byte,
-	sequence uint64, sourcePort, sourceChannel,
-	destinationPort, destinationChannel string,
-	timeoutHeight clienttypes.Height, timeoutTimestamp uint64,
-	appVersion string,
-) Packet {
-	return Packet{
-		Data:               data,
-		Sequence:           sequence,
-		SourcePort:         sourcePort,
-		SourceChannel:      sourceChannel,
-		DestinationPort:    destinationPort,
-		DestinationChannel: destinationChannel,
-		TimeoutHeight:      timeoutHeight,
-		TimeoutTimestamp:   timeoutTimestamp,
-		ProtocolVersion:    IBC_VERSION_2,
-		AppVersion:         appVersion,
 	}
 }
 
@@ -197,12 +109,6 @@ func (p Packet) ValidateBasic() error {
 	if len(p.Data) == 0 {
 		return errorsmod.Wrap(ErrInvalidPacket, "packet data bytes cannot be empty")
 	}
-	if p.AppVersion != "" && slices.Contains([]IBCVersion{IBC_VERSION_UNSPECIFIED, IBC_VERSION_1}, p.ProtocolVersion) {
-		return errorsmod.Wrapf(ErrInvalidPacket, "app version cannot be specified when packet does not use protocol %s", IBC_VERSION_2)
-	}
-	if strings.TrimSpace(p.AppVersion) == "" && p.ProtocolVersion == IBC_VERSION_2 {
-		return errorsmod.Wrapf(ErrInvalidPacket, "app version must be specified when packet uses protocol %s", IBC_VERSION_2)
-	}
 
 	return nil
 }
diff --git a/modules/core/04-channel/types/packet_test.go b/modules/core/04-channel/types/packet_test.go
index a030f813375..296ebb6d8ed 100644
--- a/modules/core/04-channel/types/packet_test.go
+++ b/modules/core/04-channel/types/packet_test.go
@@ -5,41 +5,13 @@ import (
 
 	"github.com/stretchr/testify/require"
 
-	clienttypes "github.com/cosmos/ibc-go/v9/modules/core/02-client/types"
 	"github.com/cosmos/ibc-go/v9/modules/core/04-channel/types"
 )
 
 func TestCommitPacket(t *testing.T) {
-	// V1 packet1 commitment
-	packet1 := types.NewPacket(validPacketData, 1, portid, chanid, cpportid, cpchanid, timeoutHeight, timeoutTimestamp)
-	commitment1 := types.CommitPacket(packet1)
-	require.NotNil(t, commitment1)
-
-	// V2 packet commitment with empty app version
-	packet2 := types.NewPacketWithVersion(validPacketData, 1, portid, chanid, cpportid, cpchanid, timeoutHeight, timeoutTimestamp, "")
-	commitment2 := types.CommitPacket(packet2)
-	require.NotNil(t, commitment2)
-
-	// even though app version is empty for both packet1 and packet2
-	// the commitment is different because we use Eureka protocol for packet2
-	require.NotEqual(t, commitment1, commitment2)
-
-	// V2 packet commitment with non-empty app version
-	packet3 := types.NewPacketWithVersion(validPacketData, 1, portid, chanid, cpportid, cpchanid, timeoutHeight, timeoutTimestamp, validVersion)
-	commitment3 := types.CommitPacket(packet3)
-	require.NotNil(t, commitment3)
-
-	require.NotEqual(t, commitment1, commitment3)
-	require.NotEqual(t, commitment2, commitment3)
-
-	// V2 packet commitment with non-empty app version and zero timeout height
-	packet4 := types.NewPacketWithVersion(validPacketData, 1, portid, chanid, cpportid, cpchanid, clienttypes.ZeroHeight(), timeoutTimestamp, validVersion)
-	commitment4 := types.CommitPacket(packet4)
-	require.NotNil(t, commitment4)
-
-	require.NotEqual(t, commitment1, commitment4)
-	require.NotEqual(t, commitment2, commitment4)
-	require.NotEqual(t, commitment3, commitment4)
+	packet := types.NewPacket(validPacketData, 1, portid, chanid, cpportid, cpchanid, timeoutHeight, timeoutTimestamp)
+	commitment := types.CommitPacket(packet)
+	require.NotNil(t, commitment)
 }
 
 func TestPacketValidateBasic(t *testing.T) {
@@ -58,11 +30,6 @@ func TestPacketValidateBasic(t *testing.T) {
 		{types.NewPacket(validPacketData, 1, portid, chanid, cpportid, cpchanid, disabledTimeout, 0), false, "disabled both timeout height and timestamp"},
 		{types.NewPacket(validPacketData, 1, portid, chanid, cpportid, cpchanid, disabledTimeout, timeoutTimestamp), true, "disabled timeout height, valid timeout timestamp"},
 		{types.NewPacket(validPacketData, 1, portid, chanid, cpportid, cpchanid, timeoutHeight, 0), true, "disabled timeout timestamp, valid timeout height"},
-		{types.NewPacketWithVersion(validPacketData, 1, portid, chanid, cpportid, cpchanid, timeoutHeight, timeoutTimestamp, "version"), true, "valid v2 packet"},
-		{types.Packet{1, portid, chanid, cpportid, cpchanid, validPacketData, timeoutHeight, timeoutTimestamp, types.IBC_VERSION_1, "version", "json"}, false, "invalid specifying of app version with protocol version 1"},
-		{types.Packet{1, portid, chanid, cpportid, cpchanid, validPacketData, timeoutHeight, timeoutTimestamp, types.IBC_VERSION_UNSPECIFIED, "version", "json"}, false, "invalid specifying of app version with unspecified protocol version"},
-		{types.NewPacketWithVersion(validPacketData, 1, portid, chanid, cpportid, cpchanid, timeoutHeight, timeoutTimestamp, ""), false, "app version must be specified when packet uses protocol version 2"},
-		{types.NewPacketWithVersion(validPacketData, 1, portid, chanid, cpportid, cpchanid, timeoutHeight, timeoutTimestamp, "      "), false, "app version must be specified when packet uses protocol version 2"},
 	}
 
 	for i, tc := range testCases {
diff --git a/proto/ibc/core/channel/v1/channel.proto b/proto/ibc/core/channel/v1/channel.proto
index 77b523c181f..78df62bdbb4 100644
--- a/proto/ibc/core/channel/v1/channel.proto
+++ b/proto/ibc/core/channel/v1/channel.proto
@@ -90,21 +90,6 @@ enum Order {
   ORDER_ORDERED = 2 [(gogoproto.enumvalue_customname) = "ORDERED"];
 }
 
-// IBCVersion defines the version that the IBC packet intends to use.
-// This allows asynchronous upgrades over time as unsupported IBC Versions
-// will simply be rejected by the receiver and timed out on sender.
-enum IBCVersion {
-  option (gogoproto.goproto_enum_prefix) = false;
-
-  // zero-value for IBC version.
-  // This will be treated as a classic packet
-  IBC_VERSION_UNSPECIFIED = 0;
-  // IBC version 1 implements the Classic protocol
-  IBC_VERSION_1 = 1;
-  // IBC version 2 implements the Eureka protocol
-  IBC_VERSION_2 = 2;
-}
-
 // Counterparty defines a channel end counterparty
 message Counterparty {
   option (gogoproto.goproto_getters) = false;
@@ -137,12 +122,6 @@ message Packet {
   ibc.core.client.v1.Height timeout_height = 7 [(gogoproto.nullable) = false];
   // block timestamp (in nanoseconds) after which the packet times out
   uint64 timeout_timestamp = 8;
-  // which IBC version to use to commit this packet
-  IBCVersion protocol_version = 9;
-  // version which application should use to process the packet data
-  string app_version = 10;
-  // encoding to be used TODO clearer message
-  string encoding = 11;
 }
 
 // PacketState defines the generic type necessary to retrieve and store