diff --git a/library/Magicbane/Validation.hs b/library/Magicbane/Validation.hs
--- a/library/Magicbane/Validation.hs
+++ b/library/Magicbane/Validation.hs
@@ -1,20 +1,10 @@
 {-# OPTIONS_GHC -fno-warn-orphans #-}
 {-# LANGUAGE OverloadedStrings, UnicodeSyntax #-}
 
--- | Integrates the refinement types from the refined library with aeson.
+-- | This module used to integrate the refinement types from the Refined library with aeson.
+-- | This integration is now included in Refined library (as of 0.4), but we keep the re-export for convenience.
 module Magicbane.Validation (
   module Refined
 ) where
 
 import           Refined
-import           Data.Aeson
-
-instance ToJSON α ⇒ ToJSON (Refined ρ α) where
-  toJSON = toJSON . unrefine
-
-instance (FromJSON α, Predicate ρ α) ⇒ FromJSON (Refined ρ α) where
-  parseJSON x = do
-    res ← parseJSON x
-    case refine res of
-      Right v → return v
-      Left e → fail $ show e
diff --git a/magicbane.cabal b/magicbane.cabal
--- a/magicbane.cabal
+++ b/magicbane.cabal
@@ -4,10 +4,10 @@
 --
 -- see: https://github.com/sol/hpack
 --
--- hash: 9ccf29b1676abbc411ffa8622c3786b3bf156e6c1d2e17720bbc4717a5179941
+-- hash: 1afdc0f448841cadb4ff9ee3c0689ee0853c73a6defdcb75087ad67fcdb9697d
 
 name:           magicbane
-version:        0.5.0
+version:        0.5.1
 synopsis:       A web framework that integrates Servant, RIO, EKG, fast-logger, wai-cli…
 
 description:    Inspired by Dropwizard, Magicbane provides a packaged framework for developing web services using the best available libraries, including Servant, RIO, Aeson, EKG/monad-metrics, fast-logger, wai-cli and others.
@@ -16,9 +16,9 @@
 bug-reports:    https://github.com/myfreeweb/magicbane/issues
 author:         Greg V
 maintainer:     greg@unrelenting.technology
-copyright:      2017-2018 Greg V <greg@unrelenting.technology>
+copyright:      2017-2020 Greg V <greg@unrelenting.technology>
 license:        PublicDomain
-tested-with:    GHC==8.6.5
+tested-with:    GHC==8.8.4
 build-type:     Simple
 
 source-repository head