diff --git a/packer.pkr.hcl b/packer.pkr.hcl
index 4c6f379..d542716 100644
--- a/packer.pkr.hcl
+++ b/packer.pkr.hcl
@@ -1,5 +1,13 @@
 packer {
   required_plugins {
+    amazon = {
+      source  = "github.com/hashicorp/amazon"
+      version = "~> 1"
+    }
+    chef = {
+      source  = "github.com/hashicorp/chef"
+      version = "~> 1"
+    }
     amazon-ami-management = {
       version = ">= 1.2.0"
       source  = "github.com/wata727/amazon-ami-management"