diff --git a/aeson-value-parser.cabal b/aeson-value-parser.cabal
--- a/aeson-value-parser.cabal
+++ b/aeson-value-parser.cabal
@@ -1,47 +1,85 @@
-name: aeson-value-parser
-version: 0.19.7
-synopsis: API for parsing "aeson" JSON tree into Haskell types
+cabal-version: 3.0
+name:          aeson-value-parser
+version:       0.19.7.1
+synopsis:      API for parsing "aeson" JSON tree into Haskell types
 description:
   A flexible parser DSL of JSON AST produced by the \"aeson\" library
   with automated and highly detailed error reporting.
   Provides a featureful toolkit for parsing real-world documents with schemas
   of any complexity or ambiguity, which the "FromJSON" instances
   are simply not fit for.
-category: Data, JSON, Parsing
-homepage: https://github.com/sannsyn/aeson-value-parser
-bug-reports: https://github.com/sannsyn/aeson-value-parser/issues
-author: Nikita Volkov <nikita.y.volkov@mail.ru>
-maintainer: Nikita Volkov <nikita.y.volkov@mail.ru>
-copyright: (c) 2015, Sannsyn AS
-license: MIT
-license-file: LICENSE
-build-type: Simple
-cabal-version: >=1.10
 
+category:      Data, JSON, Parsing
+homepage:      https://github.com/sannsyn/aeson-value-parser
+bug-reports:   https://github.com/sannsyn/aeson-value-parser/issues
+author:        Nikita Volkov <nikita.y.volkov@mail.ru>
+maintainer:    Nikita Volkov <nikita.y.volkov@mail.ru>
+copyright:     (c) 2015, Sannsyn AS
+license:       MIT
+license-file:  LICENSE
+
 source-repository head
-  type: git
+  type:     git
   location: git://github.com/sannsyn/aeson-value-parser.git
 
 library
-  hs-source-dirs: library
-  default-extensions: Arrows, BangPatterns, ConstraintKinds, DataKinds, DefaultSignatures, DeriveDataTypeable, DeriveFoldable, DeriveFunctor, DeriveGeneric, DeriveTraversable, EmptyDataDecls, FlexibleContexts, FlexibleInstances, FunctionalDependencies, GADTs, GeneralizedNewtypeDeriving, LambdaCase, LiberalTypeSynonyms, MagicHash, MultiParamTypeClasses, MultiWayIf, NoImplicitPrelude, NoMonomorphismRestriction, OverloadedStrings, PatternGuards, PatternSynonyms, ParallelListComp, QuasiQuotes, RankNTypes, RecordWildCards, ScopedTypeVariables, StandaloneDeriving, TemplateHaskell, TupleSections, TypeFamilies, TypeOperators, UnboxedTuples
-  default-language: Haskell2010
-  exposed-modules:
-    AesonValueParser
+  hs-source-dirs:     library
+  default-extensions:
+    NoImplicitPrelude
+    NoMonomorphismRestriction
+    Arrows
+    BangPatterns
+    ConstraintKinds
+    DataKinds
+    DefaultSignatures
+    DeriveDataTypeable
+    DeriveFoldable
+    DeriveFunctor
+    DeriveGeneric
+    DeriveTraversable
+    EmptyDataDecls
+    FlexibleContexts
+    FlexibleInstances
+    FunctionalDependencies
+    GADTs
+    GeneralizedNewtypeDeriving
+    LambdaCase
+    LiberalTypeSynonyms
+    MagicHash
+    MultiParamTypeClasses
+    MultiWayIf
+    OverloadedStrings
+    ParallelListComp
+    PatternGuards
+    PatternSynonyms
+    QuasiQuotes
+    RankNTypes
+    RecordWildCards
+    ScopedTypeVariables
+    StandaloneDeriving
+    TemplateHaskell
+    TupleSections
+    TypeFamilies
+    TypeOperators
+    UnboxedTuples
+
+  default-language:   Haskell2010
+  exposed-modules:    AesonValueParser
   other-modules:
     AesonValueParser.Error
     AesonValueParser.Prelude
     AesonValueParser.Vector
+
   build-depends:
-    aeson >=2.0.2 && <3,
-    attoparsec >=0.14 && <0.15,
-    base >=4.12 && <5,
-    bytestring >=0.10 && <0.12,
-    hashable >=1.3 && <2,
-    megaparsec >=8 && <10,
-    mtl >=2.2 && <3,
-    scientific ==0.3.*,
-    text >=1 && <3,
-    transformers >=0.5 && <0.7,
-    unordered-containers ==0.2.*,
-    vector >=0.10 && <0.13
+    , aeson >=2.0.2 && <3
+    , attoparsec >=0.14 && <0.15
+    , base >=4.12 && <5
+    , bytestring >=0.10 && <0.12
+    , hashable >=1.3 && <2
+    , megaparsec >=8 && <10
+    , mtl >=2.2 && <3
+    , scientific >=0.3 && <0.4
+    , text >=1 && <3
+    , transformers >=0.5 && <0.7
+    , unordered-containers >=0.2 && <0.3
+    , vector >=0.10 && <0.14
diff --git a/library/AesonValueParser.hs b/library/AesonValueParser.hs
--- a/library/AesonValueParser.hs
+++ b/library/AesonValueParser.hs
@@ -114,15 +114,15 @@
 
 -- | Convert into a function directly applicable as definition
 -- of 'Aeson.parseJSON'.
--- 
+--
 -- Here's an example of how it can be used:
--- 
+--
 -- @
 -- data Artist = Artist
 --   { artistName :: Text,
 --     artistGenres :: [Text]
 --   }
--- 
+--
 -- instance 'Aeson.FromJSON' Artist where
 --   'Aeson.parseJSON' = 'runAsValueParser' $
 --     'object' $ do
@@ -175,7 +175,7 @@
     x -> fmap Just (runReaderT parser x)
 
 {-# INLINE nullableMonoid #-}
-nullableMonoid :: Monoid a => Value a -> Value a
+nullableMonoid :: (Monoid a) => Value a -> Value a
 nullableMonoid (Value parser) = Value $
   ReaderT $ \case
     Aeson.Null -> pure mempty
@@ -203,7 +203,7 @@
     _ -> empty
 
 {-# INLINE fromJSON #-}
-fromJSON :: Aeson.FromJSON a => Value a
+fromJSON :: (Aeson.FromJSON a) => Value a
 fromJSON =
   Value $
     ReaderT $
@@ -279,7 +279,7 @@
       else throwError (Last (Just (fromString ("Number " <> show x <> " is not integer"))))
 
 {-# INLINE floating #-}
-floating :: RealFloat a => Number a
+floating :: (RealFloat a) => Number a
 floating = Number $
   ReaderT $ \a -> case Scientific.toBoundedRealFloat a of
     Right b -> return b
@@ -298,7 +298,7 @@
   Number parser -> parser >>= either (throwError . Last . Just) return . matcher
 
 {-# INLINE matchedFloating #-}
-matchedFloating :: RealFloat floating => (floating -> Either Text a) -> Number a
+matchedFloating :: (RealFloat floating) => (floating -> Either Text a) -> Number a
 matchedFloating matcher = Number $ case floating of
   Number parser -> parser >>= either (throwError . Last . Just) return . matcher
 
diff --git a/library/AesonValueParser/Prelude.hs b/library/AesonValueParser/Prelude.hs
--- a/library/AesonValueParser/Prelude.hs
+++ b/library/AesonValueParser/Prelude.hs
@@ -83,5 +83,5 @@
 import Unsafe.Coerce as Exports
 import Prelude as Exports hiding (all, and, any, concat, concatMap, elem, fail, foldl, foldl1, foldr, foldr1, id, mapM, mapM_, maximum, minimum, notElem, or, product, sequence, sequence_, sum, (.))
 
-showText :: Show a => a -> Text
+showText :: (Show a) => a -> Text
 showText = fromString . show