diff --git a/Data/Aeson.hs b/Data/Aeson.hs
--- a/Data/Aeson.hs
+++ b/Data/Aeson.hs
@@ -113,6 +113,7 @@
     , sumEncoding
     , unwrapUnaryRecords
     , tagSingleConstructors
+    , rejectUnknownFields
     -- *** Options utilities
     , SumEncoding(..)
     , camelTo2
diff --git a/Data/Aeson/Types/Internal.hs b/Data/Aeson/Types/Internal.hs
--- a/Data/Aeson/Types/Internal.hs
+++ b/Data/Aeson/Types/Internal.hs
@@ -4,6 +4,7 @@
 {-# LANGUAGE GeneralizedNewtypeDeriving #-}
 {-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE Rank2Types #-}
+{-# LANGUAGE StandaloneDeriving #-}
 #if __GLASGOW_HASKELL__ >= 800
 -- a) THQ works on cross-compilers and unregisterised GHCs
 -- b) may make compilation faster as no dynamic loading is ever needed (not sure about this)
@@ -366,6 +367,17 @@
            | Bool !Bool
            | Null
              deriving (Eq, Read, Show, Typeable, Data, Generic)
+
+-- |
+--
+-- The ordering is total, consistent with 'Eq' innstance.
+-- However, nothing else about the ordering is specified,
+-- and it may change from environment to environment and version to version
+-- of either this package or its dependencies ('hashable' and 'unordered-containers').
+--
+-- @since 1.5.2.0
+deriving instance Ord Value
+-- standalone deriving to attach since annotation.
 
 -- | A newtype wrapper for 'UTCTime' that uses the same non-standard
 -- serialization format as Microsoft .NET, whose
diff --git a/aeson.cabal b/aeson.cabal
--- a/aeson.cabal
+++ b/aeson.cabal
@@ -1,5 +1,5 @@
 name:            aeson
-version:         1.5.1.0
+version:         1.5.2.0
 license:         BSD3
 license-file:    LICENSE
 category:        Text, Web, JSON
@@ -133,22 +133,17 @@
     build-depends: nats >= 1.1.1 && < 1.2,
                    void >= 0.7.2 && < 0.8
 
-  -- cannot use latest version
-  build-depends:
-    unordered-containers >= 0.2.8.0  && < 0.3,
-
-    -- not in LTS-12.10
-    tagged               >= 0.8.5    && < 0.9,
-    primitive            >= 0.6.3.0  && < 0.8
-
   -- Other dependencies
   build-depends:
     attoparsec           >= 0.13.2.2 && < 0.14,
     dlist                >= 0.8.0.4  && < 0.9,
     hashable             >= 1.2.7.0  && < 1.4,
+    primitive            >= 0.7.0.1  && < 0.8,
     scientific           >= 0.3.6.2  && < 0.4,
+    tagged               >= 0.8.6    && < 0.9,
     th-abstraction       >= 0.2.8.0  && < 0.4,
     these                >= 1.1      && < 1.2,
+    unordered-containers >= 0.2.10.0 && < 0.3,
     uuid-types           >= 1.0.3    && < 1.1,
     vector               >= 0.12.0.1 && < 0.13
 
diff --git a/changelog.md b/changelog.md
--- a/changelog.md
+++ b/changelog.md
@@ -1,5 +1,10 @@
 For the latest version of this document, please see [https://github.com/bos/aeson/blob/master/changelog.md](https://github.com/bos/aeson/blob/master/changelog.md).
 
+### 1.5.2.0
+
+* Add `Ord Value` instance, thanks to Oleg Grenrus.
+* Export `rejectUnknownFields` from `Data.Aeson`
+
 ### 1.5.1.0
 
 * Add instances for `these`, thanks to Oleg Grenrus.