diff --git a/package.yaml b/package.yaml
index ecafdfa..1a6e5b5 100644
--- a/package.yaml
+++ b/package.yaml
@@ -6,16 +6,11 @@ category: Web
 author: Alexey Kotlyarov
 maintainer: a@koterpillar.com
 license: MIT
+language: GHC2021
 default-extensions:
-- DeriveDataTypeable
-- DeriveGeneric
-- FlexibleContexts
-- FlexibleInstances
 - FunctionalDependencies
-- MultiParamTypeClasses
 - OverloadedStrings
 - QuasiQuotes
-- RankNTypes
 - RecordWildCards
 dependencies:
 - base >=4.7 && <5