diff --git a/x/opchild/ante/fee_utils.go b/x/opchild/ante/fee_utils.go
index 3110557..fe4ad90 100644
--- a/x/opchild/ante/fee_utils.go
+++ b/x/opchild/ante/fee_utils.go
@@ -1,6 +1,7 @@
 package ante
 
 import (
+	"cosmossdk.io/math"
 	sdk "github.com/cosmos/cosmos-sdk/types"
 )
 
@@ -26,7 +27,7 @@ func computeRequiredFees(gas uint64, minGasPrices sdk.DecCoins) sdk.Coins {
 		// Determine the required fees by multiplying each required minimum gas
 		// price by the gas limit, where fee = ceil(minGasPrice * gasLimit).
 		for i, gp := range minGasPrices {
-			fee := gp.Amount.MulInt64(int64(gas))
+			fee := gp.Amount.MulInt(math.NewIntFromUint64(gas))
 			requiredFees[i] = sdk.NewCoin(gp.Denom, fee.Ceil().RoundInt())
 		}
 	}
diff --git a/x/opchild/keeper/msg_server.go b/x/opchild/keeper/msg_server.go
index 1add4b4..137fbce 100644
--- a/x/opchild/keeper/msg_server.go
+++ b/x/opchild/keeper/msg_server.go
@@ -109,7 +109,12 @@ func (ms MsgServer) ExecuteMessages(ctx context.Context, req *types.MsgExecuteMe
 
 		// assert that the opchild module account is the only signer for ExecuteMessages message
 		if !bytes.Equal(signers[0], authority) {
-			return nil, errorsmod.Wrapf(types.ErrInvalidSigner, sdk.AccAddress(signers[0]).String())
+			signer, err := ms.addressCodec.BytesToString(signers[0])
+			if err != nil {
+				return nil, err
+			}
+
+			return nil, errorsmod.Wrap(types.ErrInvalidSigner, signer)
 		}
 
 		handler := ms.Router().Handler(msg)
diff --git a/x/opchild/keeper/oracle.go b/x/opchild/keeper/oracle.go
index ac8b9f0..83350fe 100644
--- a/x/opchild/keeper/oracle.go
+++ b/x/opchild/keeper/oracle.go
@@ -65,7 +65,9 @@ func (k L2OracleHandler) UpdateOracle(ctx context.Context, height uint64, extCom
 		return err
 	}
 
-	if hostStoreLastHeight > int64(height) {
+	//nolint:gosec
+	h := int64(height)
+	if hostStoreLastHeight > h {
 		return types.ErrInvalidOracleHeight
 	}
 
@@ -83,7 +85,7 @@ func (k L2OracleHandler) UpdateOracle(ctx context.Context, height uint64, extCom
 		return err
 	}
 
-	err = l2slinky.ValidateVoteExtensions(sdkCtx, k.HostValidatorStore, int64(height-1), hostChainID, extendedCommitInfo)
+	err = l2slinky.ValidateVoteExtensions(sdkCtx, k.HostValidatorStore, h-1, hostChainID, extendedCommitInfo)
 	if err != nil {
 		return err
 	}