diff --git a/go.mod b/go.mod
index 3720bfca852d..f4e34c248f7b 100644
--- a/go.mod
+++ b/go.mod
@@ -11,7 +11,7 @@ require (
 	cosmossdk.io/log v1.1.0
 	cosmossdk.io/math v1.0.0
 	cosmossdk.io/store v0.1.0-alpha.1.0.20230328185921-37ba88872dbc
-	cosmossdk.io/x/tx v0.6.1
+	cosmossdk.io/x/tx v0.6.3
 	github.com/99designs/keyring v1.2.1
 	github.com/armon/go-metrics v0.4.1
 	github.com/bgentry/speakeasy v0.1.1-0.20220910012023-760eaf8b6816
@@ -164,8 +164,6 @@ require (
 replace (
 	cosmossdk.io/core => ./core
 	cosmossdk.io/store => ./store
-	// TODO: remove after release 0.6.2
-	cosmossdk.io/x/tx => ./x/tx
 	// use cosmos fork of keyring
 	github.com/99designs/keyring => github.com/cosmos/keyring v1.2.0
 	// dgrijalva/jwt-go is deprecated and doesn't receive security updates.
diff --git a/go.sum b/go.sum
index 5d8f0dd94550..f037d196144a 100644
--- a/go.sum
+++ b/go.sum
@@ -47,6 +47,8 @@ cosmossdk.io/log v1.1.0 h1:v0ogPHYeTzPcBTcPR1A3j1hkei4pZama8kz8LKlCMv0=
 cosmossdk.io/log v1.1.0/go.mod h1:6zjroETlcDs+mm62gd8Ig7mZ+N+fVOZS91V17H+M4N4=
 cosmossdk.io/math v1.0.0 h1:ro9w7eKx23om2tZz/VM2Pf+z2WAbGX1yDQQOJ6iGeJw=
 cosmossdk.io/math v1.0.0/go.mod h1:Ygz4wBHrgc7g0N+8+MrnTfS9LLn9aaTGa9hKopuym5k=
+cosmossdk.io/x/tx v0.6.3 h1:B9uRBUYrjEuq972T0ma0BCDu5QDElqsQkJuM+UZlDhA=
+cosmossdk.io/x/tx v0.6.3/go.mod h1:Fm+6hJnc0Zivgy90sPbAHaDnucg1qyo8MtA7h3qJHP0=
 dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
 filippo.io/edwards25519 v1.0.0 h1:0wAIcmJUqRdI8IJ/3eGi5/HwXZWPujYXXlkrQogz0Ek=
 filippo.io/edwards25519 v1.0.0/go.mod h1:N1IkdkCkiLB6tki+MYJoSx2JTY9NUlxZE7eHn5EwJns=
diff --git a/simapp/go.mod b/simapp/go.mod
index 887e3c8a522c..75f871fb1d6b 100644
--- a/simapp/go.mod
+++ b/simapp/go.mod
@@ -38,7 +38,7 @@ require (
 	cloud.google.com/go/storage v1.30.0 // indirect
 	cosmossdk.io/collections v0.1.0 // indirect
 	cosmossdk.io/errors v1.0.0-beta.7.0.20230429155654-3ee8242364e4 // indirect
-	cosmossdk.io/x/tx v0.6.1 // indirect
+	cosmossdk.io/x/tx v0.6.3 // indirect
 	filippo.io/edwards25519 v1.0.0 // indirect
 	github.com/99designs/go-keychain v0.0.0-20191008050251-8e49817e8af4 // indirect
 	github.com/99designs/keyring v1.2.1 // indirect
diff --git a/tests/go.mod b/tests/go.mod
index 2314e605e2a4..0622e7d74b55 100644
--- a/tests/go.mod
+++ b/tests/go.mod
@@ -14,7 +14,7 @@ require (
 	cosmossdk.io/x/evidence v0.1.0
 	cosmossdk.io/x/feegrant v0.0.0-20230117113717-50e7c4a4ceff
 	cosmossdk.io/x/nft v0.0.0-20230113085233-fae3332d62fc
-	cosmossdk.io/x/tx v0.6.1
+	cosmossdk.io/x/tx v0.6.3
 	cosmossdk.io/x/upgrade v0.0.0-20230127052425-54c8e1568335
 	github.com/cometbft/cometbft v0.37.1
 	github.com/cosmos/cosmos-db v1.0.0-rc.1
@@ -200,9 +200,6 @@ replace (
 	cosmossdk.io/x/upgrade => ../x/upgrade
 )
 
-// temporary replace
-replace cosmossdk.io/x/tx => ../x/tx
-
 // Below are the long-lived replace for tests.
 replace (
 	cosmossdk.io/core => ../core
diff --git a/tests/go.sum b/tests/go.sum
index 95e98f411f7b..97a5a28e40fe 100644
--- a/tests/go.sum
+++ b/tests/go.sum
@@ -200,6 +200,8 @@ cosmossdk.io/log v1.1.0 h1:v0ogPHYeTzPcBTcPR1A3j1hkei4pZama8kz8LKlCMv0=
 cosmossdk.io/log v1.1.0/go.mod h1:6zjroETlcDs+mm62gd8Ig7mZ+N+fVOZS91V17H+M4N4=
 cosmossdk.io/math v1.0.0 h1:ro9w7eKx23om2tZz/VM2Pf+z2WAbGX1yDQQOJ6iGeJw=
 cosmossdk.io/math v1.0.0/go.mod h1:Ygz4wBHrgc7g0N+8+MrnTfS9LLn9aaTGa9hKopuym5k=
+cosmossdk.io/x/tx v0.6.3 h1:B9uRBUYrjEuq972T0ma0BCDu5QDElqsQkJuM+UZlDhA=
+cosmossdk.io/x/tx v0.6.3/go.mod h1:Fm+6hJnc0Zivgy90sPbAHaDnucg1qyo8MtA7h3qJHP0=
 dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
 filippo.io/edwards25519 v1.0.0 h1:0wAIcmJUqRdI8IJ/3eGi5/HwXZWPujYXXlkrQogz0Ek=
 filippo.io/edwards25519 v1.0.0/go.mod h1:N1IkdkCkiLB6tki+MYJoSx2JTY9NUlxZE7eHn5EwJns=
diff --git a/types/simulation/types.go b/types/simulation/types.go
index 34d29d04e323..4d1da924f149 100644
--- a/types/simulation/types.go
+++ b/types/simulation/types.go
@@ -2,14 +2,20 @@ package simulation
 
 import (
 	"encoding/json"
+	"fmt"
 	"math/rand"
 	"time"
 
+	gogoproto "github.com/cosmos/gogoproto/proto"
+	"google.golang.org/protobuf/proto"
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	"google.golang.org/protobuf/types/dynamicpb"
+
+	"cosmossdk.io/x/tx/signing/aminojson"
 	"github.com/cosmos/cosmos-sdk/baseapp"
 	"github.com/cosmos/cosmos-sdk/codec"
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	"github.com/cosmos/cosmos-sdk/types/kv"
-	"github.com/cosmos/cosmos-sdk/x/auth/migrations/legacytx"
 )
 
 // Deprecated: Use WeightedProposalMsg instead.
@@ -95,11 +101,26 @@ func NewOperationMsg(msg sdk.Msg, ok bool, comment string, cdc *codec.ProtoCodec
 		moduleName = msgType
 	}
 
-	if legacyMsg, okType := msg.(legacytx.LegacyMsg); okType {
-		return NewOperationMsgBasic(moduleName, msgType, comment, ok, legacyMsg.GetSignBytes())
+	resolver := gogoproto.HybridResolver
+	desc, err := resolver.FindDescriptorByName(protoreflect.FullName(gogoproto.MessageName(msg)))
+	if err != nil {
+		panic(fmt.Errorf("failed to find proto descriptor for %s: %w", msgType, err))
+	}
+
+	dynamicMsg := dynamicpb.NewMessageType(desc.(protoreflect.MessageDescriptor)).New().Interface()
+	gogoBytes, err := gogoproto.Marshal(msg)
+	if err != nil {
+		panic(fmt.Errorf("failed to marshal msg: %w", err))
+	}
+	err = proto.Unmarshal(gogoBytes, dynamicMsg)
+
+	encoder := aminojson.NewEncoder()
+	jsonBytes, err := encoder.Marshal(dynamicMsg)
+	if err != nil {
+		panic(fmt.Errorf("failed to marshal msg: %w", err))
 	}
 
-	return NewOperationMsgBasic(moduleName, msgType, comment, ok, cdc.MustMarshalJSON(msg))
+	return NewOperationMsgBasic(moduleName, msgType, comment, ok, jsonBytes)
 }
 
 // NoOpMsg - create a no-operation message