diff --git a/cmd/gsap-attestor/main.go b/cmd/gsap-attestor/main.go
index 95f72c3..726a79f 100644
--- a/cmd/gsap-attestor/main.go
+++ b/cmd/gsap-attestor/main.go
@@ -2,7 +2,6 @@ package main
 
 import (
 	"context"
-	"encoding/json"
 	"sync"
 
 	"github.com/hashicorp/hcl/v2/hclsimple"
@@ -42,7 +41,7 @@ func (p *Plugin) Attest(ctx context.Context, req *workloadattestorv1.AttestReque
 
 func decodeConfig(data string) (GsapAttestorConfig, error) {
 	var cfg GsapAttestorConfig
-	if err := json.Unmarshal([]byte(data), &cfg); err != nil {
+	if err := hclsimple.Decode("plugin.json", []byte(data), nil, &cfg); err != nil {
 		if err2 := hclsimple.Decode("plugin.hcl", []byte(data), nil, &cfg); err2 != nil {
 			return cfg, err2
 		}