diff --git a/main.go b/main.go
index 4c76067..a0ef8f6 100644
--- a/main.go
+++ b/main.go
@@ -390,9 +390,9 @@ func loadDatabase(data []byte) (string, error) {
 
 func parseFilter(filter string) (*FilterParams, error) {
 	params := &FilterParams{}
-	parts := strings.Fields(filter)
+	parts := strings.FieldsSeq(filter)
 
-	for _, part := range parts {
+	for part := range parts {
 		kv := strings.SplitN(part, ":", 2)
 		if len(kv) != 2 {
 			continue
@@ -497,7 +497,7 @@ func executeCredentialAction(params *FilterParams) (json.RawMessage, error) {
 func executeSessionAction(params *FilterParams) (json.RawMessage, error) {
 	switch params.Action {
 	case "list":
-		return json.Marshal([]map[string]interface{}{})
+		return json.Marshal([]map[string]any{})
 	case "create":
 		return json.Marshal(map[string]string{"session_id": "sess_placeholder"})
 	case "revoke":
@@ -510,7 +510,7 @@ func executeSessionAction(params *FilterParams) (json.RawMessage, error) {
 func executeGrantAction(params *FilterParams) (json.RawMessage, error) {
 	switch params.Action {
 	case "list":
-		return json.Marshal([]map[string]interface{}{})
+		return json.Marshal([]map[string]any{})
 	case "create":
 		return json.Marshal(map[string]string{"grant_id": "grant_placeholder"})
 	case "revoke":