diff --git a/log/handler.go b/log/handler.go
index 290e381509..c604a62301 100644
--- a/log/handler.go
+++ b/log/handler.go
@@ -118,7 +118,7 @@ func JSONHandler(wr io.Writer) slog.Handler {
 	return JSONHandlerWithLevel(wr, levelMaxVerbosity)
 }
 
-// JSONHandler returns a handler which prints records in JSON format that are less than or equal to
+// JSONHandlerWithLevel returns a handler which prints records in JSON format that are less than or equal to
 // the specified verbosity level.
 func JSONHandlerWithLevel(wr io.Writer, level slog.Level) slog.Handler {
 	return slog.NewJSONHandler(wr, &slog.HandlerOptions{
diff --git a/signer/core/apitypes/types.go b/signer/core/apitypes/types.go
index eba9d7768f..9113c091c5 100644
--- a/signer/core/apitypes/types.go
+++ b/signer/core/apitypes/types.go
@@ -25,6 +25,7 @@ import (
 	"math/big"
 	"reflect"
 	"regexp"
+	"slices"
 	"sort"
 	"strconv"
 	"strings"
@@ -386,16 +387,8 @@ func (typedData *TypedData) HashStruct(primaryType string, data TypedDataMessage
 // Dependencies returns an array of custom types ordered by their hierarchical reference tree
 func (typedData *TypedData) Dependencies(primaryType string, found []string) []string {
 	primaryType = strings.TrimSuffix(primaryType, "[]")
-	includes := func(arr []string, str string) bool {
-		for _, obj := range arr {
-			if obj == str {
-				return true
-			}
-		}
-		return false
-	}
 
-	if includes(found, primaryType) {
+	if slices.Contains(found, primaryType) {
 		return found
 	}
 	if typedData.Types[primaryType] == nil {
@@ -404,7 +397,7 @@ func (typedData *TypedData) Dependencies(primaryType string, found []string) []s
 	found = append(found, primaryType)
 	for _, field := range typedData.Types[primaryType] {
 		for _, dep := range typedData.Dependencies(field.Type, found) {
-			if !includes(found, dep) {
+			if !slices.Contains(found, dep) {
 				found = append(found, dep)
 			}
 		}