diff --git a/sig/yaml_vault.rbs b/sig/yaml_vault.rbs
index 2b12a5d..78b137e 100644
--- a/sig/yaml_vault.rbs
+++ b/sig/yaml_vault.rbs
@@ -2,31 +2,35 @@ module YamlVault
   class Main
     @yaml: String
     @keys: Array[String]
-    @prefix: String
-    @suffix: String
-    @passphrase: String
-    @sign_passphrase: String
-    @salt: String
-    @cipher: String
+    @prefix: String?
+    @suffix: String?
+    @passphrase: String?
+    @sign_passphrase: String?
+    @salt: String?
+    @cipher: String?
     @key_len: Integer
     @signature_key_len: Integer
     @digest: String
-    @aws_kms_key_id: String
-    @aws_region: String
-    @aws_access_key_id: String
-    @aws_secret_access_key: String
-    @aws_profile: String
-    @gcp_kms_resource_id: String
-    @gcp_credential_file: String
+    @aws_kms_key_id: String?
+    @aws_region: String?
+    @aws_access_key_id: String?
+    @aws_secret_access_key: String?
+    @aws_profile: String?
+    @gcp_kms_resource_id: String?
+    @gcp_credential_file: String?
     @cryptor: _Cryptor
 
+    def initialize: (String, Array[String], ?String?, ?String?, ?String?, ?passphrase: String?, ?sign_passphrase: String?, ?salt: String?, ?cipher: String, ?key_len: Integer, ?signature_key_len: Integer, ?digest: String,
+      ?aws_kms_key_id: String?, ?aws_region: String?, ?aws_access_key_id: String?, ?aws_secret_access_key: String?, ?aws_profile: String?,
+      ?gcp_kms_resource_id: String?, ?gcp_credential_file: String?) -> void
+
     def encrypt: () -> untyped
     def decrypt: () -> untyped
     def encrypt_hash: () -> Hash[String, Object]
     def decrypt_hash: () -> Hash[String, Object]
     def encrypt_yaml: () -> String
     def decrypt_yaml: () -> String
-    def get_cryptor: (String) -> _Cryptor
+    def get_cryptor: (String?) -> _Cryptor
 
     module ValueCryptor
       class KMS