diff --git a/proto/agynio/api/networks/v1/networks.proto b/proto/agynio/api/networks/v1/networks.proto
index 5d064b0..3d0a37d 100644
--- a/proto/agynio/api/networks/v1/networks.proto
+++ b/proto/agynio/api/networks/v1/networks.proto
@@ -78,6 +78,7 @@ enum PrivateResourceAccessPrincipalType {
   PRIVATE_RESOURCE_ACCESS_PRINCIPAL_TYPE_USER = 2;
   PRIVATE_RESOURCE_ACCESS_PRINCIPAL_TYPE_APP = 3;
   PRIVATE_RESOURCE_ACCESS_PRINCIPAL_TYPE_GROUP = 4;
+  PRIVATE_RESOURCE_ACCESS_PRINCIPAL_TYPE_ENVIRONMENT = 5;
 }
 
 // Organization-scoped private network.