diff --git a/definitions/draco_rest/data_types/rest_adapter_auth_type.proto.json b/definitions/draco_rest/data_types/rest_adapter_auth_type.proto.json
index f0e2075..2d2a54b 100644
--- a/definitions/draco_rest/data_types/rest_adapter_auth_type.proto.json
+++ b/definitions/draco_rest/data_types/rest_adapter_auth_type.proto.json
@@ -18,7 +18,7 @@
       "content": "Webhook credential variant"
     }
   ],
-  "type": "'Bearer JWT' | 'Bearer static' | 'Basic'",
+  "type": "'Bearer JWT' | 'Bearer static' | 'Basic' | undefined | null",
   "linkedDataTypeIdentifiers": [],
   "rules": []
 }
diff --git a/definitions/draco_rest/data_types/rest_adapter_auth_value.proto.json b/definitions/draco_rest/data_types/rest_adapter_auth_value.proto.json
index 4f69a1f..8038039 100644
--- a/definitions/draco_rest/data_types/rest_adapter_auth_value.proto.json
+++ b/definitions/draco_rest/data_types/rest_adapter_auth_value.proto.json
@@ -19,7 +19,7 @@
     }
   ],
   "genericKeys": ["T"],
-  "type": "T extends 'Basic' ? { username: string, password: string } : T extends undefined ? undefined : string",
+  "type": "T extends 'Basic' ? { username: string, password: string } : T extends undefined ? undefined : T extends null ? null : string",
   "linkedDataTypeIdentifiers": [],
   "rules": []
 }
diff --git a/definitions/taurus/http/data_types/http_auth_place.proto.json b/definitions/taurus/http/data_types/http_auth_place.proto.json
index 9185894..e35d3ca 100644
--- a/definitions/taurus/http/data_types/http_auth_place.proto.json
+++ b/definitions/taurus/http/data_types/http_auth_place.proto.json
@@ -19,7 +19,7 @@
     }
   ],
   "genericKeys": ["T"],
-  "type": "T extends 'Bearer' ? 'Header' : T extends 'Basic' ? 'Header' : T extends undefined ? undefined : 'Header' | 'Url'",
+  "type": "T extends 'Bearer' ? 'Header' : T extends 'Basic' ? 'Header' : T extends undefined ? undefined : T extends null ? null : 'Header' | 'Url'",
   "linkedDataTypeIdentifiers": [],
   "rules": []
 }
diff --git a/definitions/taurus/http/data_types/http_auth_type.proto.json b/definitions/taurus/http/data_types/http_auth_type.proto.json
index e64bc0b..bd3acfa 100644
--- a/definitions/taurus/http/data_types/http_auth_type.proto.json
+++ b/definitions/taurus/http/data_types/http_auth_type.proto.json
@@ -18,7 +18,7 @@
       "content": "HTTP credential variant"
     }
   ],
-  "type": "'Bearer' | 'Basic' | 'X-API-Key' | string | undefined",
+  "type": "'Bearer' | 'Basic' | 'X-API-Key' | string | undefined | null",
   "linkedDataTypeIdentifiers": [],
   "rules": []
 }
diff --git a/definitions/taurus/http/data_types/http_auth_value.proto.json b/definitions/taurus/http/data_types/http_auth_value.proto.json
index 7546842..e8a454a 100644
--- a/definitions/taurus/http/data_types/http_auth_value.proto.json
+++ b/definitions/taurus/http/data_types/http_auth_value.proto.json
@@ -19,7 +19,7 @@
     }
   ],
   "genericKeys": ["T"],
-  "type": "T extends 'Basic' ? { username: string, password: string } : T extends undefined ? undefined : string",
+  "type": "T extends 'Basic' ? { username: string, password: string } : T extends undefined ? undefined : T extends null ? null : string",
   "linkedDataTypeIdentifiers": [],
   "rules": []
 }
diff --git a/definitions/taurus/http/data_types/http_payload.proto.json b/definitions/taurus/http/data_types/http_payload.proto.json
index 1e2207e..3c0a490 100644
--- a/definitions/taurus/http/data_types/http_payload.proto.json
+++ b/definitions/taurus/http/data_types/http_payload.proto.json
@@ -19,7 +19,7 @@
     }
   ],
   "genericKeys": ["T"],
-  "type": "T extends 'application/json' ? OBJECT<{}> : T extends undefined ? undefined : string",
+  "type": "T extends 'application/json' ? OBJECT<{}> : T extends undefined ? undefined : T extends null ? null : string",
   "linkedDataTypeIdentifiers": ["OBJECT"],
   "rules": []
 }
diff --git a/definitions/taurus/http/data_types/http_schema.proto.json b/definitions/taurus/http/data_types/http_schema.proto.json
index c8bd807..c03d71f 100644
--- a/definitions/taurus/http/data_types/http_schema.proto.json
+++ b/definitions/taurus/http/data_types/http_schema.proto.json
@@ -18,7 +18,7 @@
       "content": "HTTP schema"
     }
   ],
-  "type": "'application/json' | 'application/xml' | 'text/plain' | 'text/csv' | string | undefined",
+  "type": "'application/json' | 'application/xml' | 'text/plain' | 'text/csv' | string | undefined | null",
   "linkedDataTypeIdentifiers": [],
   "rules": []
 }