diff --git a/haxl.cabal b/haxl.cabal
index 8106318..f96e728 100644
--- a/haxl.cabal
+++ b/haxl.cabal
@@ -43,7 +43,7 @@ extra-source-files:
 library
 
   build-depends:
-    aeson >= 0.6 && < 1.6,
+    aeson >= 0.6 && < 2.1,
     base >= 4.10 && < 5,
     binary >= 0.7 && < 0.10,
     bytestring >= 0.9 && < 0.11,
diff --git a/stack.yaml b/stack.yaml
index 10b0c58..df137d5 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -1,4 +1,4 @@
-resolver: lts-8.15
+resolver: lts-19.2
 
 packages:
   - '.'
diff --git a/stack.yaml.lock b/stack.yaml.lock
new file mode 100644
index 0000000..5e0d4ce
--- /dev/null
+++ b/stack.yaml.lock
@@ -0,0 +1,12 @@
+# This file was autogenerated by Stack.
+# You should not edit this file by hand.
+# For more information, please see the documentation at:
+#   https://docs.haskellstack.org/en/stable/lock_files
+
+packages: []
+snapshots:
+- completed:
+    size: 617368
+    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/19/2.yaml
+    sha256: e7e57649a12f6178d1158e4b6f1f1885ed56d210ae6174385271cecc9b1ea974
+  original: lts-19.2
diff --git a/tests/ProfileTests.hs b/tests/ProfileTests.hs
index 8d31175..ae44fa3 100644
--- a/tests/ProfileTests.hs
+++ b/tests/ProfileTests.hs
@@ -7,6 +7,7 @@
 {-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE RecordWildCards #-}
+{-# LANGUAGE CPP #-}
 
 module ProfileTests where
 
@@ -23,6 +24,11 @@ import Control.Exception (evaluate)
 import Data.Aeson
 import Data.IORef
 import qualified Data.HashMap.Strict as HashMap
+#if MIN_VERSION_aeson(2,0,0)
+import qualified Data.Aeson.KeyMap as KeyMap
+#else
+import qualified Data.HashMap.Strict as KeyMap
+#endif
 import Data.Int
 
 import TestUtils
@@ -53,7 +59,7 @@ collectsdata = do
               slp <- sum <$> mapM (\x -> withLabel "baz" $ return x) [1..5]
               -- do some non-trivial work that can't be lifted out
               -- first sleep though in order to force a Blocked result
-              sleep slp `andThen` case fromJSON <$> HashMap.lookup "A" u of
+              sleep slp `andThen` case fromJSON <$> KeyMap.lookup "A" u of
                 Just (Success n) | sum [n .. 1000::Integer] > 0 -> return 5
                 _otherwise -> return (4::Int)
   profCopy <- readIORef (profRef e)
@@ -94,7 +100,7 @@ collectsLazyData = do
   _x <- runHaxl e $ withLabel "bar" $ do
           u <- env userEnv
           withLabel "foo" $ do
-             let start = if HashMap.member "A" u
+             let start = if KeyMap.member "A" u
                          then 10
                          else 1
              return $ sum [start..10000::Integer]
diff --git a/tests/TestTypes.hs b/tests/TestTypes.hs
index 1f533d5..cb5e1a2 100644
--- a/tests/TestTypes.hs
+++ b/tests/TestTypes.hs
@@ -7,6 +7,7 @@
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE GeneralizedNewtypeDeriving #-}
 {-# LANGUAGE DeriveDataTypeable #-}
+{-# LANGUAGE CPP #-}
 
 module TestTypes
    ( UserEnv
@@ -18,29 +19,40 @@ module TestTypes
 
 import Data.Aeson
 import Data.Binary (Binary)
-import Data.Text (Text)
 import qualified Data.Text as Text
-import qualified Data.HashMap.Strict as HashMap
+#if MIN_VERSION_aeson(2,0,0)
+import qualified Data.Aeson.KeyMap as KeyMap
+import Data.Aeson.Key (toText)
+#else
+import qualified Data.HashMap.Strict as KeyMap
+#endif
 import Data.Hashable
 import Data.Typeable
 
 import Haxl.Core
 
+#if !MIN_VERSION_aeson(2,0,0)
+type Key = Text.Text
+
+toText :: Key -> Text.Text
+toText = id
+#endif
+
 type UserEnv = Object
 type Haxl a = GenHaxl UserEnv () a
 type HaxlEnv = Env UserEnv ()
 
-lookupInput :: FromJSON a => Text -> Haxl a
+lookupInput :: FromJSON a => Key -> Haxl a
 lookupInput field = do
-  mb_val <- env (HashMap.lookup field . userEnv)
+  mb_val <- env (KeyMap.lookup field . userEnv)
   case mb_val of
     Nothing ->
-      throw (NotFound (Text.concat ["field ", field, " was not found."]))
+      throw (NotFound (Text.concat ["field ", toText field, " was not found."]))
     Just val ->
       case fromJSON val of
         Error str ->
           throw (UnexpectedType (Text.concat
-            ["field ", field, ": ", Text.pack str]))
+            ["field ", toText field, ": ", Text.pack str]))
         Success a -> return a
 
 
diff --git a/tests/TestUtils.hs b/tests/TestUtils.hs
index e8ba513..92201a4 100644
--- a/tests/TestUtils.hs
+++ b/tests/TestUtils.hs
@@ -5,6 +5,7 @@
 -- found in the LICENSE file.
 
 {-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE CPP #-}
 module TestUtils
   ( makeTestEnv
   , expectResultWithEnv
@@ -21,7 +22,11 @@ import Haxl.DataSource.ConcurrentIO
 import Data.IORef
 import Data.Aeson
 import Test.HUnit
-import qualified Data.HashMap.Strict as HashMap
+#if MIN_VERSION_aeson(2,0,0)
+import qualified Data.Aeson.KeyMap as KeyMap
+#else
+import qualified Data.HashMap.Strict as KeyMap
+#endif
 
 import Haxl.Core
 
@@ -29,7 +34,7 @@ import Prelude()
 import Haxl.Prelude
 
 testinput :: Object
-testinput = HashMap.fromList [
+testinput = KeyMap.fromList [
   "A" .= (1 :: Int),
   "B" .= (2 :: Int),
   "C" .= (3 :: Int),