diff --git a/CHANGELOG.md b/CHANGELOG.md
index 67c6214280f..1bec30fd4a4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -85,6 +85,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 * [#13236](https://github.com/cosmos/cosmos-sdk/pull/13236) Integrate Filter Logging
 * [#13528](https://github.com/cosmos/cosmos-sdk/pull/13528) Update `ValidateMemoDecorator` to only check memo against `MaxMemoCharacters` param when a memo is present.
 * [#13651](https://github.com/cosmos/cosmos-sdk/pull/13651) Update `server/config/config.GetConfig` function.
+* [#13781](https://github.com/cosmos/cosmos-sdk/pull/13781) Remove `client/keys.KeysCdc`.
 * [#13803](https://github.com/cosmos/cosmos-sdk/pull/13803) Add an error log if iavl set operation failed.
 
 ### State Machine Breaking
diff --git a/client/keys/add.go b/client/keys/add.go
index 62bdc67dbab..72a5e7cd08f 100644
--- a/client/keys/add.go
+++ b/client/keys/add.go
@@ -3,6 +3,7 @@ package keys
 import (
 	"bufio"
 	"bytes"
+	"encoding/json"
 	"errors"
 	"fmt"
 	"sort"
@@ -313,7 +314,7 @@ func printCreate(cmd *cobra.Command, k *keyring.Record, showMnemonic bool, mnemo
 			out.Mnemonic = mnemonic
 		}
 
-		jsonString, err := KeysCdc.MarshalJSON(out)
+		jsonString, err := json.Marshal(out)
 		if err != nil {
 			return err
 		}
diff --git a/client/keys/codec.go b/client/keys/codec.go
deleted file mode 100644
index 3b1f6fc38b3..00000000000
--- a/client/keys/codec.go
+++ /dev/null
@@ -1,27 +0,0 @@
-package keys
-
-import (
-	"github.com/cosmos/cosmos-sdk/codec"
-	cryptocodec "github.com/cosmos/cosmos-sdk/crypto/codec"
-)
-
-// TODO: remove this file https://github.com/cosmos/cosmos-sdk/issues/8047
-
-// KeysCdc defines codec to be used with key operations
-var KeysCdc *codec.LegacyAmino
-
-func init() {
-	KeysCdc = codec.NewLegacyAmino()
-	cryptocodec.RegisterCrypto(KeysCdc)
-	KeysCdc.Seal()
-}
-
-// marshal keys
-func MarshalJSON(o interface{}) ([]byte, error) {
-	return KeysCdc.MarshalJSON(o)
-}
-
-// unmarshal json
-func UnmarshalJSON(bz []byte, ptr interface{}) error {
-	return KeysCdc.UnmarshalJSON(bz, ptr)
-}
diff --git a/client/keys/codec_test.go b/client/keys/codec_test.go
deleted file mode 100644
index f61792e600d..00000000000
--- a/client/keys/codec_test.go
+++ /dev/null
@@ -1,97 +0,0 @@
-package keys_test
-
-import (
-	"bytes"
-	"testing"
-
-	"github.com/stretchr/testify/require"
-
-	"github.com/cosmos/cosmos-sdk/client/keys"
-	"github.com/cosmos/cosmos-sdk/crypto/keyring"
-)
-
-type testCases struct {
-	Keys    []keyring.KeyOutput
-	Answers []keyring.KeyOutput
-	JSON    [][]byte
-}
-
-func getTestCases() testCases {
-	return testCases{
-		// nolint:govet
-		[]keyring.KeyOutput{
-			{"A", "B", "C", "D", "E"},
-			{"A", "B", "C", "D", ""},
-			{"", "B", "C", "D", ""},
-			{"", "", "", "", ""},
-		},
-		make([]keyring.KeyOutput, 4),
-		[][]byte{
-			[]byte(`{"name":"A","type":"B","address":"C","pubkey":"D","mnemonic":"E"}`),
-			[]byte(`{"name":"A","type":"B","address":"C","pubkey":"D"}`),
-			[]byte(`{"name":"","type":"B","address":"C","pubkey":"D"}`),
-			[]byte(`{"name":"","type":"","address":"","pubkey":""}`),
-		},
-	}
-}
-
-func TestMarshalJSON(t *testing.T) {
-	type args struct {
-		o keyring.KeyOutput
-	}
-
-	data := getTestCases()
-
-	tests := []struct {
-		name    string
-		args    args
-		want    []byte
-		wantErr bool
-	}{
-		{"basic", args{data.Keys[0]}, data.JSON[0], false},
-		{"mnemonic is optional", args{data.Keys[1]}, data.JSON[1], false},
-
-		// REVIEW: Are the next results expected??
-		{"empty name", args{data.Keys[2]}, data.JSON[2], false},
-		{"empty object", args{data.Keys[3]}, data.JSON[3], false},
-	}
-	for _, tt := range tests {
-		tt := tt
-		t.Run(tt.name, func(t *testing.T) {
-			got, err := keys.MarshalJSON(tt.args.o)
-			require.Equal(t, tt.wantErr, err != nil)
-			require.True(t, bytes.Equal(got, tt.want))
-		})
-	}
-}
-
-func TestUnmarshalJSON(t *testing.T) {
-	type args struct {
-		bz  []byte
-		ptr interface{}
-	}
-
-	data := getTestCases()
-
-	tests := []struct {
-		name    string
-		args    args
-		wantErr bool
-	}{
-		{"basic", args{data.JSON[0], &data.Answers[0]}, false},
-		{"mnemonic is optional", args{data.JSON[1], &data.Answers[1]}, false},
-
-		// REVIEW: Are the next results expected??
-		{"empty name", args{data.JSON[2], &data.Answers[2]}, false},
-		{"empty object", args{data.JSON[3], &data.Answers[3]}, false},
-	}
-	for idx, tt := range tests {
-		idx, tt := idx, tt
-		t.Run(tt.name, func(t *testing.T) {
-			err := keys.UnmarshalJSON(tt.args.bz, tt.args.ptr)
-			require.Equal(t, tt.wantErr, err != nil)
-			// Confirm deserialized objects are the same
-			require.Equal(t, data.Keys[idx], data.Answers[idx])
-		})
-	}
-}
diff --git a/client/keys/parse.go b/client/keys/parse.go
index ba3d3c64b14..b616c5dcdd0 100644
--- a/client/keys/parse.go
+++ b/client/keys/parse.go
@@ -2,6 +2,7 @@ package keys
 
 import (
 	"encoding/hex"
+	"encoding/json"
 	"errors"
 	"fmt"
 	"io"
@@ -140,7 +141,7 @@ func displayParseKeyInfo(w io.Writer, stringer fmt.Stringer, output string) {
 		out, err = yaml.Marshal(&stringer)
 
 	case OutputFormatJSON:
-		out, err = KeysCdc.MarshalJSON(stringer)
+		out, err = json.Marshal(&stringer)
 	}
 
 	if err != nil {
diff --git a/client/keys/utils.go b/client/keys/utils.go
index 114e6315c9a..a5d8460c282 100644
--- a/client/keys/utils.go
+++ b/client/keys/utils.go
@@ -1,6 +1,7 @@
 package keys
 
 import (
+	"encoding/json"
 	"fmt"
 	"io"
 
@@ -30,7 +31,7 @@ func printKeyringRecord(w io.Writer, k *cryptokeyring.Record, bechKeyOut bechKey
 		}
 
 	case OutputFormatJSON:
-		out, err := KeysCdc.MarshalJSON(ko)
+		out, err := json.Marshal(ko)
 		if err != nil {
 			return err
 		}
@@ -57,8 +58,7 @@ func printKeyringRecords(w io.Writer, records []*cryptokeyring.Record, output st
 
 	case OutputFormatJSON:
 		// TODO https://github.com/cosmos/cosmos-sdk/issues/8046
-		// Replace AminoCdc with Proto JSON
-		out, err := KeysCdc.MarshalJSON(kos)
+		out, err := json.Marshal(kos)
 		if err != nil {
 			return err
 		}