diff --git a/yammat.cabal b/yammat.cabal
index 67f2969..49f3249 100644
--- a/yammat.cabal
+++ b/yammat.cabal
@@ -68,6 +68,8 @@ library
                 DerivingStrategies
                 StandaloneDeriving
                 UndecidableInstances
+                DataKinds
+                FlexibleInstances
 
     build-depends: base                          >= 4          && < 5
                  , yesod                         >= 1.6