diff --git a/clientcontroller/babylon.go b/clientcontroller/babylon.go
index 2b7efaa..57be717 100644
--- a/clientcontroller/babylon.go
+++ b/clientcontroller/babylon.go
@@ -2,6 +2,7 @@ package clientcontroller
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"math"
 	"time"
@@ -108,7 +109,7 @@ func (bc *BabylonController) QueryStakingParamsByVersion(version uint32) (*types
 	for _, pk := range stakingParamRes.Params.CovenantPks {
 		covPk, err := pk.ToBTCPK()
 		if err != nil {
-			return nil, fmt.Errorf("invalid covenant public key")
+			return nil, errors.New("invalid covenant public key")
 		}
 		covenantPks = append(covenantPks, covPk)
 	}
@@ -242,11 +243,11 @@ func DelegationRespToDelegation(del *btcstakingtypes.BTCDelegationResponse) (*ty
 	)
 
 	if del.StakingTxHex == "" {
-		return nil, fmt.Errorf("staking tx should not be empty in delegation")
+		return nil, errors.New("staking tx should not be empty in delegation")
 	}
 
 	if del.SlashingTxHex == "" {
-		return nil, fmt.Errorf("slashing tx should not be empty in delegation")
+		return nil, errors.New("slashing tx should not be empty in delegation")
 	}
 
 	for _, s := range del.CovenantSigs {
@@ -270,7 +271,7 @@ func DelegationRespToDelegation(del *btcstakingtypes.BTCDelegationResponse) (*ty
 	}
 
 	if del.UnbondingTime > uint32(math.MaxUint16) {
-		return nil, fmt.Errorf("unbonding time should be smaller than max uint16")
+		return nil, errors.New("unbonding time should be smaller than max uint16")
 	}
 
 	if del.TotalSat > uint64(math.MaxInt64) {
@@ -301,11 +302,11 @@ func UndelegationRespToUndelegation(undel *btcstakingtypes.BTCUndelegationRespon
 	)
 
 	if undel.UnbondingTxHex == "" {
-		return nil, fmt.Errorf("staking tx should not be empty in undelegation")
+		return nil, errors.New("staking tx should not be empty in undelegation")
 	}
 
 	if undel.SlashingTxHex == "" {
-		return nil, fmt.Errorf("slashing tx should not be empty in undelegation")
+		return nil, errors.New("slashing tx should not be empty in undelegation")
 	}
 
 	for _, unbondingSig := range undel.CovenantUnbondingSigList {
diff --git a/config/config.go b/config/config.go
index dc57336..5d46d37 100644
--- a/config/config.go
+++ b/config/config.go
@@ -1,6 +1,7 @@
 package config
 
 import (
+	"errors"
 	"fmt"
 	"path/filepath"
 	"time"
@@ -90,11 +91,11 @@ func LoadConfig(homePath string) (*Config, error) {
 // normalized. The cleaned up config is returned on success.
 func (cfg *Config) Validate() error {
 	if cfg.Metrics == nil {
-		return fmt.Errorf("empty metrics config")
+		return errors.New("empty metrics config")
 	}
 
 	if err := cfg.Metrics.Validate(); err != nil {
-		return fmt.Errorf("invalid metrics config")
+		return errors.New("invalid metrics config")
 	}
 
 	switch cfg.BitcoinNetwork {
diff --git a/covenant-signer/cmd/signerCmd.go b/covenant-signer/cmd/signerCmd.go
index db8922d..acbc2b5 100644
--- a/covenant-signer/cmd/signerCmd.go
+++ b/covenant-signer/cmd/signerCmd.go
@@ -43,7 +43,7 @@ var runSignerCmd = &cobra.Command{
 			}
 			prk = kr
 		} else {
-			return fmt.Errorf("unknown key store type")
+			return errors.New("unknown key store type")
 		}
 
 		app := signerapp.NewSignerApp(
diff --git a/covenant-signer/config/keystore.go b/covenant-signer/config/keystore.go
index 12c8d65..86d97fb 100644
--- a/covenant-signer/config/keystore.go
+++ b/covenant-signer/config/keystore.go
@@ -1,6 +1,8 @@
 package config
 
-import "fmt"
+import (
+	"errors"
+)
 
 type KeyStoreType int
 
@@ -13,7 +15,7 @@ func KeyStoreToString(c KeyStoreType) (string, error) {
 	case CosmosKeyStore:
 		return "cosmos", nil
 	default:
-		return "", fmt.Errorf("unknown key store type")
+		return "", errors.New("unknown key store type")
 	}
 }
 
@@ -22,7 +24,7 @@ func KeyStoreFromString(s string) (KeyStoreType, error) {
 	case "cosmos":
 		return CosmosKeyStore, nil
 	default:
-		return -1, fmt.Errorf("unknown key store type")
+		return -1, errors.New("unknown key store type")
 	}
 }
 
diff --git a/covenant-signer/keystore/cosmos/cosmoskeyretriever.go b/covenant-signer/keystore/cosmos/cosmoskeyretriever.go
index cb2f3e7..efef11f 100644
--- a/covenant-signer/keystore/cosmos/cosmoskeyretriever.go
+++ b/covenant-signer/keystore/cosmos/cosmoskeyretriever.go
@@ -2,6 +2,7 @@ package cosmos
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"strings"
 	"sync"
@@ -41,7 +42,7 @@ func (k *CosmosKeyringRetriever) PrivKey(ctx context.Context) (*btcec.PrivateKey
 	defer k.mu.Unlock()
 
 	if k.btcecPrivKey == nil {
-		return nil, fmt.Errorf("private key is not unlocked. Please call Unlock() first")
+		return nil, errors.New("private key is not unlocked. Please call Unlock() first")
 	}
 
 	return k.btcecPrivKey, nil