diff --git a/monadic-recursion-schemes.cabal b/monadic-recursion-schemes.cabal
--- a/monadic-recursion-schemes.cabal
+++ b/monadic-recursion-schemes.cabal
@@ -4,7 +4,7 @@
 -- http://haskell.org/cabal/users-guide/
 
 name:                monadic-recursion-schemes
-version:             0.1.13.1
+version:             0.1.13.2
 synopsis:            Recursion Schemes for Monadic version.
 description:         Yet another recursion schemes for monadic style, depends on recursion-schemes.
 homepage:            https://github.com/cutsea110/monadic-recursion-schemes.git
@@ -28,7 +28,7 @@
                        GADTs,
                        LambdaCase,
                        ScopedTypeVariables
-  build-depends:       base >=4.12.0.0 && <4.16,
+  build-depends:       base >=4.12.0.0 && <4.19,
                        containers >=0.6,
                        mtl >=2.2.2,
                        transformers >=0.5.6,
@@ -44,4 +44,4 @@
   type:                exitcode-stdio-1.0
   hs-source-dirs:      test
   main-is:             MyLibTest.hs
-  build-depends:       base >=4.12.0.0 && <4.16
+  build-depends:       base >=4.12.0.0
diff --git a/src/Data/Functor/Foldable/Monadic.hs b/src/Data/Functor/Foldable/Monadic.hs
--- a/src/Data/Functor/Foldable/Monadic.hs
+++ b/src/Data/Functor/Foldable/Monadic.hs
@@ -6,6 +6,7 @@
 {-# LANGUAGE GADTs #-}
 {-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE ScopedTypeVariables #-}
+{-# LANGUAGE TypeOperators #-}
 module Data.Functor.Foldable.Monadic
   ( -- * Folding
     cataM