diff --git a/Data/Aeson/IP.hs b/Data/Aeson/IP.hs
--- a/Data/Aeson/IP.hs
+++ b/Data/Aeson/IP.hs
@@ -1,16 +1,11 @@
-{-# LANGUAGE CPP #-}
 {-# LANGUAGE FlexibleContexts #-}
 {-# LANGUAGE UndecidableInstances #-}
 module Data.Aeson.IP () where
 
-#if __GLASGOW_HASKELL__ <= 708
-import Control.Applicative (pure)
-#endif
-
 import           Data.Aeson
+import qualified Data.Aeson.Key as Key
+import qualified Data.Aeson.KeyMap as KeyMap
 import           Data.Aeson.Types
-import           Data.Aeson.Internal
-import qualified Data.HashMap.Strict as HashMap
 import           Data.IP
 import           Data.IP.RouteTable (Routable, IPRTable)
 import qualified Data.IP.RouteTable as RouteTable
@@ -121,8 +116,8 @@
          ) => FromJSON1 (IPRTable k) where
     liftParseJSON p _ = case fromJSONKey of
         FromJSONKeyTextParser f -> withObject "IPRTable k v" $
-            HashMap.foldrWithKey
-                (\k v rt -> RouteTable.insert <$> f k <?> Key k
+            KeyMap.foldrWithKey
+                (\k v rt -> RouteTable.insert <$> f (Key.toText k) <?> Key k
                                               <*> p v <?> Key k
                                               <*> rt)
                 (pure RouteTable.empty)
@@ -137,7 +132,7 @@
 
 instance (Routable k, Show k, ToJSON k) => ToJSON1 (IPRTable k) where
     liftToJSON g _ = case toJSONKey of
-        ToJSONKeyText f _ -> Object . HashMap.fromList
+        ToJSONKeyText f _ -> Object . KeyMap.fromList
                                     . map (\(k, v) -> (f k, g v))
                                     . RouteTable.toList
         _ -> error "using IPRTable as a JSON key is not yet supported"
diff --git a/aeson-iproute.cabal b/aeson-iproute.cabal
--- a/aeson-iproute.cabal
+++ b/aeson-iproute.cabal
@@ -2,7 +2,7 @@
 -- documentation, see http://haskell.org/cabal/users-guide/
 
 name:                aeson-iproute
-version:             0.2.1
+version:             0.3.0
 synopsis:            Aeson instances for iproute types
 description:         Aeson instances for iproute types.
 license:             BSD3
@@ -13,15 +13,14 @@
 category:            Data
 build-type:          Simple
 cabal-version:       >=1.10
-Tested-With:         GHC == 8.4.4, GHC == 8.6.5, GHC == 8.8.4, GHC == 8.10.2
+Tested-With:         GHC == 8.10.7, GHC == 9.0.1
 
 library
   exposed-modules:     Data.Aeson.IP
-  build-depends:       aeson >= 0.8,
+  build-depends:       aeson >= 2.0 && < 3.0,
                        base >=4 && <5,
                        iproute >= 1.7.3,
-                       text >= 1.0,
-                       unordered-containers
+                       text >= 1.0
                         
                         
   default-language:    Haskell2010