1 files changed, 7 insertions, 2 deletions
diff --git a/chelleport.cabal b/chelleport.cabal
index 5e68240..ebca222 100644
--- a/chelleport.cabal
+++ b/chelleport.cabal
@@ -17,17 +17,22 @@ Flag release
 common common-config
   default-extensions:
     ExplicitForAll,
+    FlexibleContexts,
+    FlexibleInstances,
+    GeneralizedNewtypeDeriving,
     LambdaCase,
+    NamedFieldPuns,
+    NumericUnderscores,
     OverloadedStrings,
     QuasiQuotes,
     TemplateHaskell,
     TupleSections,
-    NumericUnderscores,
-    NamedFieldPuns
+    UndecidableInstances
   default-language: Haskell2010
   build-depends:
     base,
     text,
+    mtl == 2.3.1,
     containers
 
 common warnings