diff --git a/cmd/cmd.go b/cmd/cmd.go
index 1568dd6..a68d0cd 100644
--- a/cmd/cmd.go
+++ b/cmd/cmd.go
@@ -64,14 +64,28 @@ func initConfig() {
 
 	handlerOptions := &slog.HandlerOptions{
 		Level:     level,
-		AddSource: level <= slog.LevelDebug,
+		AddSource: level <= -100,
 	}
 	var handler slog.Handler
 	switch format {
 	case "json":
 		handler = slog.NewJSONHandler(os.Stderr, handlerOptions)
 	case "text":
-		handler = slog.NewTextHandler(os.Stderr, handlerOptions)
+		suppress := func(
+			next func([]string, slog.Attr) slog.Attr,
+		) func([]string, slog.Attr) slog.Attr {
+			return func(groups []string, a slog.Attr) slog.Attr {
+				if a.Key == slog.TimeKey {
+					return slog.Attr{}
+				}
+				if next == nil {
+					return a
+				}
+				return next(groups, a)
+			}
+		}
+		handlerOptions.ReplaceAttr = suppress(handlerOptions.ReplaceAttr)
+		handler = slog.NewTextHandler(os.Stdout, handlerOptions)
 	default:
 		log.Panicf("unknown log format: %s", format)
 	}
diff --git a/cmd/secrets/secrets.go b/cmd/secrets/secrets.go
index 0dde744..4938ad8 100644
--- a/cmd/secrets/secrets.go
+++ b/cmd/secrets/secrets.go
@@ -10,7 +10,7 @@ import (
 	"github.com/plumber-cd/argocd-cmp-replicator/k8s"
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"
-	"gopkg.in/yaml.v2"
+	"sigs.k8s.io/yaml"
 )
 
 func init() {
@@ -47,12 +47,17 @@ var Cmd = &cobra.Command{
 				slog.Error("Both ARGOCD_APP_PARAMETERS and --alternative-label-selector were set")
 				return fmt.Errorf("Both ARGOCD_APP_PARAMETERS and --alternative-label-selector were set")
 			}
+			slog.Debug("ARGOCD_APP_PARAMETERS", "value", v)
 			params := argocdv1alpha1.ApplicationSourcePluginParameters{}
 			if err := yaml.Unmarshal([]byte(v), &params); err != nil {
 				return err
 			}
 			for _, param := range params {
 				if param.Name == "alternative-label-selector" {
+					if param.String_ == nil {
+						slog.Error("alternative-label-selector is not a string")
+						return fmt.Errorf("alternative-label-selector is not a string")
+					}
 					alternativeLabelSelector = *param.String_
 					break
 				}
diff --git a/go.mod b/go.mod
index 152a4c1..5eab2b2 100644
--- a/go.mod
+++ b/go.mod
@@ -7,11 +7,11 @@ require (
 	github.com/spf13/cobra v1.8.0
 	github.com/spf13/viper v1.18.2
 	github.com/stretchr/testify v1.8.4
-	gopkg.in/yaml.v2 v2.4.0
 	k8s.io/api v0.26.11
 	k8s.io/apimachinery v0.26.11
 	k8s.io/cli-runtime v0.26.11
 	k8s.io/client-go v0.26.11
+	sigs.k8s.io/yaml v1.3.0
 )
 
 // https://argo-cd.readthedocs.io/en/stable/user-guide/import/
@@ -179,6 +179,7 @@ require (
 	gopkg.in/inf.v0 v0.9.1 // indirect
 	gopkg.in/ini.v1 v1.67.0 // indirect
 	gopkg.in/warnings.v0 v0.1.2 // indirect
+	gopkg.in/yaml.v2 v2.4.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 	k8s.io/apiextensions-apiserver v0.26.10 // indirect
 	k8s.io/apiserver v0.26.11 // indirect
@@ -195,5 +196,4 @@ require (
 	sigs.k8s.io/kustomize/api v0.13.5-0.20230601165947-6ce0bf390ce3 // indirect
 	sigs.k8s.io/kustomize/kyaml v0.14.3-0.20230601165947-6ce0bf390ce3 // indirect
 	sigs.k8s.io/structured-merge-diff/v4 v4.4.1 // indirect
-	sigs.k8s.io/yaml v1.3.0 // indirect
 )