diff --git a/.travis.yml b/.travis.yml
index 76c22bd..f7149aa 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -12,10 +12,10 @@ cache:
 
 matrix:
   include:
-  - ghc: 8.8.1
-  - ghc: 8.6.5
-  - ghc: 8.4.4
-  - ghc: 8.2.2
+  - ghc: 9.8.2
+  - ghc: 9.6.6
+  - ghc: 9.4.8
+  - ghc: 9.2.8
 
 install:
   - |
diff --git a/cabal.project b/cabal.project
index 5174797..b5444dd 100644
--- a/cabal.project
+++ b/cabal.project
@@ -1,5 +1,4 @@
 packages:
-  ./
-  hreq-client/
-  hreq-core/
-  hreq-conduit/
+  ./hreq-client/
+  ./hreq-core/
+  ./hreq-conduit/
diff --git a/hreq-client/hreq-client.cabal b/hreq-client/hreq-client.cabal
index a3eb0f5..993eb83 100644
--- a/hreq-client/hreq-client.cabal
+++ b/hreq-client/hreq-client.cabal
@@ -13,10 +13,10 @@ license:        MIT
 license-file:   LICENSE.md
 extra-doc-files: CHANGELOG.md, README.md
 tested-with:
-   GHC  ==8.2.2
-    ||  ==8.4.4
-    ||  ==8.6.5
-    ||  ==8.8.1
+   GHC  ==9.2.8
+    ||  ==9.4.8
+    ||  ==9.6.6
+    ||  ==9.8.2
 build-type: Custom
 
 source-repository head
@@ -38,23 +38,23 @@ library
   default-extensions: LambdaCase DeriveGeneric FlexibleInstances FlexibleContexts ScopedTypeVariables TypeApplications TypeOperators MultiParamTypeClasses RecordWildCards TypeApplications TypeFamilies OverloadedStrings GADTs GeneralizedNewtypeDeriving FunctionalDependencies ConstraintKinds RankNTypes PolyKinds DataKinds KindSignatures ViewPatterns UndecidableInstances StrictData
 
   build-depends:
-    base                 >= 4.10.1 && < 5,
-    base-compat          >= 0.10.5 && < 0.13,
-    bytestring           >= 0.10.8 && < 0.11,
-    containers           >= 0.5.7.1 && < 0.7,
-    exceptions           >= 0.10.0 && < 0.11,
-    http-client          >= 0.6.4 && < 0.7,
-    http-client-tls      >= 0.3.5 && < 0.4,
-    hreq-core            >= 0.1.1,
-    http-media           >= 0.8.0 && < 0.9,
-    http-types           >= 0.12.3 && < 0.13,
-    mtl                  >= 2.2.2 && < 3.0,
-    retry                >= 0.8   && < 0.9,
-    time                 >= 1.6.0.1 && < 2.0,
-    text                 >= 1.2.4 && < 1.3,
-    stm                  >= 2.4.5.1 && < 2.6,
-    unliftio-core        >= 0.1.2 && < 0.2.0,
-    string-conversions   >= 0.4.0 && < 0.5
+    base                >= 4.14    && < 5,
+    base-compat         >= 0.10.5  && < 0.15,
+    bytestring          >= 0.10.8  && < 0.13,
+    containers          >= 0.5.7.1 && < 0.8,
+    exceptions          >= 0.10.0  && < 0.11,
+    http-client         >= 0.6.4   && < 0.8,
+    http-client-tls     >= 0.3.5   && < 0.4,
+    hreq-core           >= 0.1.1,
+    http-media          >= 0.8.0   && < 0.9,
+    http-types          >= 0.12.3  && < 0.13,
+    mtl                 >= 2.2.2   && < 3.0,
+    retry               >= 0.8     && < 0.9,
+    time                >= 1.6.0.1 && < 2.0,
+    text                >= 1.2.4   && < 2.2,
+    stm                 >= 2.4.5.1 && < 2.6,
+    unliftio-core      ^>= 0.2,
+    string-conversions  >= 0.4.0   && < 0.5
 
   ghc-options:
     -Wall
@@ -78,16 +78,16 @@ executable example
   build-depends:
       base >= 4.10.1 && < 5
     , hreq-client
-    , aeson  >= 1.4.5 && < 1.5
-    , text  >= 1.2.4 && < 1.3
+    , aeson >= 1.4.5  && < 1.6 || >= 2.2 && < 2.3
+    , text  >= 1.2.4  && < 1.3 || >= 2.0 && < 2.2
 
 test-suite spec
   build-depends:
-      base       >= 4.10.1 && < 5
-    , aeson      >= 1.4.5  && < 1.5
-    , containers >= 0.5.7.1 && < 0.7
-    , http-types >= 0.12.3 && < 0.13
-    , hspec      >= 2.6.0  && < 2.8
+      base       >= 4.10.1  && < 5
+    , aeson      >= 1.4.5   && < 1.6 || >= 2.2 && < 2.3
+    , containers >= 0.5.7.1 && < 0.8
+    , http-types >= 0.12.3  && < 0.13
+    , hspec      >= 2.6.0   && < 2.8
     , hreq-client
     , hreq-core
   main-is:             Spec.hs
@@ -109,9 +109,9 @@ test-suite doctests
   type:             exitcode-stdio-1.0
   main-is:          DocTests.hs
   build-depends:
-      base       >= 4.10.1 && < 5
-    , aeson      >= 1.4.5 && < 1.5
-    , doctest    >=0.15 && < 0.17
+      base       >= 4.14  && < 5
+    , aeson      >= 1.4.5 && < 1.6  || >= 2.2 && < 2.3
+    , doctest    >= 0.15  && < 0.23
     , hreq-client
 
   ghc-options:      -Wall -threaded
diff --git a/hreq-conduit/hreq-conduit.cabal b/hreq-conduit/hreq-conduit.cabal
index f3fff98..10fc5e2 100644
--- a/hreq-conduit/hreq-conduit.cabal
+++ b/hreq-conduit/hreq-conduit.cabal
@@ -13,10 +13,10 @@ license:        MIT
 license-file:   LICENSE.md
 extra-doc-files: CHANGELOG.md, README.md
 tested-with:
-   GHC  ==8.2.2
-    ||  ==8.4.4
-    ||  ==8.6.5
-    ||  ==8.8.1
+   GHC  ==9.2.8
+    ||  ==9.4.8
+    ||  ==9.6.6
+    ||  ==9.8.2
 build-type: Custom
 
 custom-setup
@@ -39,17 +39,17 @@ library
   default-extensions: LambdaCase DeriveGeneric FlexibleInstances FlexibleContexts ScopedTypeVariables TypeApplications TypeOperators MultiParamTypeClasses RecordWildCards TypeApplications TypeFamilies OverloadedStrings GADTs GeneralizedNewtypeDeriving FunctionalDependencies ConstraintKinds RankNTypes PolyKinds DataKinds KindSignatures ViewPatterns UndecidableInstances StrictData
 
   build-depends:
-    base                 >= 4.10.1 && < 5,
-    bytestring           >= 0.10.8 && < 0.11,
-    exceptions           >= 0.10.0 && < 0.11,
-    http-client          >= 0.6.4 && < 0.7,
-    http-types           >= 0.12.3 && < 0.13,
-    hreq-client          >= 0.1.0,
-    hreq-core            >= 0.1.0,
-    conduit              >=1.3.1   && <1.4,
-    mtl                  >= 2.2.2 && < 3.0,
-    retry                >= 0.8   && < 0.9,
-    unliftio-core        >= 0.1.2 && < 0.2.0
+    base            >= 4.14   && < 5,
+    bytestring      >= 0.10.8 && < 0.13,
+    exceptions      >= 0.10.0 && < 0.11,
+    http-client     >= 0.6.4  && < 0.8,
+    http-types      >= 0.12.3 && < 0.13,
+    hreq-client     >= 0.1.0,
+    hreq-core       >= 0.1.0,
+    conduit         >= 1.3.1  && < 1.4,
+    mtl             >= 2.2.2  && < 3.0,
+    retry           >= 0.8    && < 0.9,
+    unliftio-core  ^>= 0.2.0
 
   ghc-options:
     -Wall
@@ -69,12 +69,12 @@ test-suite spec
 
   build-depends:
       base               >= 4.10.1 && < 5
-    , conduit            >=1.3.1   && <1.4
+    , conduit            >= 1.3.1  && <1.4
     , http-types         >= 0.12.3 && < 0.13
     , hspec              >= 2.6.0  && < 2.8
     , hreq-conduit
     , string-conversions >= 0.4.0 && < 0.5
-    , text               >= 1.2.4 && < 1.3
+    , text               >= 1.2.4 && < 1.3 || >= 2.0 && < 2.2
   main-is:             Spec.hs
   other-modules: Hreq.HttpBin.SuccessSpec
   hs-source-dirs:      test
@@ -87,9 +87,9 @@ test-suite spec
 
 test-suite readme
   build-depends:
-      base              >= 4.10.1 && < 5
-    , conduit           >=1.3.1   && <1.4
-    , bytestring        >= 0.10.8 && < 0.11
+      base               >= 4.10.1 && < 5
+    , conduit            >= 1.3.1  && < 1.4
+    , bytestring         >= 0.10.8 && < 0.11
     , hreq-conduit
     , string-conversions >= 0.4.0 && < 0.5
     , text               >= 1.2.4 && < 1.3
@@ -104,9 +104,9 @@ test-suite doctests
   type:             exitcode-stdio-1.0
   main-is:          DocTests.hs
   build-depends:
-      base       >= 4.10.1 && < 5
-    , aeson      >= 1.4.5 && < 1.5
-    , doctest    >=0.15 && < 0.17
+      base       >= 4.14  && < 5
+    , aeson      >= 1.4.5 && < 1.6 || >= 2.2 && < 2.3
+    , doctest    >= 0.15  && < 0.23
     , hreq-conduit
 
   ghc-options:      -Wall -threaded
diff --git a/hreq-conduit/src/Hreq/Conduit/Internal/HTTP.hs b/hreq-conduit/src/Hreq/Conduit/Internal/HTTP.hs
index ff74e4c..17e906e 100644
--- a/hreq-conduit/src/Hreq/Conduit/Internal/HTTP.hs
+++ b/hreq-conduit/src/Hreq/Conduit/Internal/HTTP.hs
@@ -75,12 +75,12 @@ runStreamingHttp
 runStreamingHttp req f = do
     config <- ask
     let manager = httpManager config
-    let baseUrl = httpBaseUrl config
-    let statusRange = httpStatuses config
+        baseUrl = httpBaseUrl config
+        statusRange = httpStatuses config
 
-    let httpRequest = requestToHTTPRequest baseUrl req
+        httpRequest = requestToHTTPRequest baseUrl req
 
-    let action = liftIO $ catchConnectionError $ HTTP.withResponse httpRequest manager $ \res -> do
+        action = liftIO $ catchConnectionError $ HTTP.withResponse httpRequest manager $ \res -> do
                     checkStreamResponse res statusRange
                     f (ResBodyStream $ bodyReaderSource (HTTP.responseBody res))
 
diff --git a/hreq-core/hreq-core.cabal b/hreq-core/hreq-core.cabal
index bf5e968..e81e7bb 100644
--- a/hreq-core/hreq-core.cabal
+++ b/hreq-core/hreq-core.cabal
@@ -13,10 +13,10 @@ license:        MIT
 license-file:   LICENSE.md
 extra-doc-files: CHANGELOG.md, README.md
 tested-with:
-   GHC  ==8.2.2
-    ||  ==8.4.4
-    ||  ==8.6.5
-    ||  ==8.8.1
+   GHC  ==9.2.8
+    ||  ==9.4.8
+    ||  ==9.6.6
+    ||  ==9.8.2
 build-type: Custom
 
 source-repository head
@@ -54,19 +54,20 @@ library
 
   default-extensions: LambdaCase DeriveGeneric FlexibleInstances FlexibleContexts ScopedTypeVariables TypeApplications TypeOperators MultiParamTypeClasses RecordWildCards TypeApplications TypeFamilies OverloadedStrings GADTs GeneralizedNewtypeDeriving FunctionalDependencies ConstraintKinds RankNTypes PolyKinds DataKinds KindSignatures ViewPatterns UndecidableInstances StrictData
   build-depends:
-    base                 >= 4.10.1 && < 5,
-    base-compat          >= 0.10.5 && < 0.13,
-    aeson                >= 1.4.5 && < 1.5,
-    attoparsec           >= 0.13.2.2 && < 0.14,
-    bytestring           >= 0.10.8 && < 0.11,
-    containers           >= 0.5.7.1 && < 0.7,
-    exceptions           >= 0.10.0 && < 0.11,
-    http-api-data        >= 0.4.1 && < 0.5,
-    http-media           >= 0.8.0 && < 0.9,
-    http-types           >= 0.12.3 && < 0.13,
-    mtl                  >= 2.2.2 && < 3.0,
-    text                 >= 1.2.4 && < 1.3,
-    string-conversions   >= 0.4.0 && < 0.5
+    base                 >= 4.14     && < 5,
+    base-compat          >= 0.10.5   && < 0.13,
+    aeson                >= 1.4.5    && < 1.6 || >= 2.2 && < 2.3,
+    attoparsec           >= 0.13.2.2 && < 0.15,
+    attoparsec-aeson     >= 2.0,
+    bytestring           >= 0.10.8   && < 0.13,
+    containers           >= 0.5.7.1  && < 0.8,
+    exceptions           >= 0.10.0   && < 0.11,
+    http-api-data        >= 0.4.1    && < 0.7,
+    http-media           >= 0.8.0    && < 0.9,
+    http-types           >= 0.12.3   && < 0.13,
+    mtl                  >= 2.2.2    && < 3.0,
+    text                 >= 1.2.4    && < 2.2,
+    string-conversions   >= 0.4.0    && < 0.5
   ghc-options:
     -Wall
     -Wincomplete-uni-patterns
@@ -85,8 +86,8 @@ test-suite doctests
   type:             exitcode-stdio-1.0
   main-is:          DocTests.hs
   build-depends:
-      base       >= 4.10.1 && < 5
-    , doctest    >=0.15 && < 0.17
+      base       >= 4.14 && < 5
+    , doctest    >= 0.15 && < 0.23
     , hreq-core
 
   ghc-options:      -Wall -threaded
diff --git a/hreq-core/src/Data/Singletons.hs b/hreq-core/src/Data/Singletons.hs
index 7b086df..e8d4c47 100644
--- a/hreq-core/src/Data/Singletons.hs
+++ b/hreq-core/src/Data/Singletons.hs
@@ -15,11 +15,18 @@
     ===Attribution
     Some of the code in this module was directly borrowed from the Singletons library
 -}
-{-# LANGUAGE TypeInType #-}
+{-# LANGUAGE CPP       #-}
+{-# LANGUAGE DataKinds #-}
+{-# LANGUAGE PolyKinds #-}
 module Data.Singletons where
 
 import Data.Kind
+
+#if MIN_VERSION_base(4,18,0)
+import GHC.TypeLits hiding (SNat, SSymbol)
+#else
 import GHC.TypeLits
+#endif
 import Data.Typeable
 
 -- * Sing Type family
diff --git a/hreq-core/src/Hreq/Core/API/Request.hs b/hreq-core/src/Hreq/Core/API/Request.hs
index f8a3b4c..e18803b 100644
--- a/hreq-core/src/Hreq/Core/API/Request.hs
+++ b/hreq-core/src/Hreq/Core/API/Request.hs
@@ -4,7 +4,7 @@
 module Hreq.Core.API.Request where
 
 import Data.Kind (Type)
-import Data.Singletons (Sing, SingI(..))
+import Data.Singletons (Sing, SingI (..))
 import GHC.TypeLits (Symbol)
 
 -- * Request Type
diff --git a/hreq-core/src/Hreq/Core/API/TypeLevel.hs b/hreq-core/src/Hreq/Core/API/TypeLevel.hs
index c3e47b6..5fd124c 100644
--- a/hreq-core/src/Hreq/Core/API/TypeLevel.hs
+++ b/hreq-core/src/Hreq/Core/API/TypeLevel.hs
@@ -2,18 +2,18 @@
 --
 module Hreq.Core.API.TypeLevel where
 
-import Data.Kind (Type, Constraint)
-import GHC.TypeLits (Symbol, TypeError, ErrorMessage(..), KnownSymbol, KnownNat)
+import Data.Kind (Constraint, Type)
+import GHC.TypeLits (ErrorMessage (..), KnownNat, KnownSymbol, Symbol, TypeError)
 import Network.HTTP.Types (Header)
 import Web.HttpApiData (ToHttpApiData)
 
-import Hreq.Core.Client.BasicAuth (BasicAuthData)
-import Hreq.Core.API.Request (ReqContent(..))
-import Hreq.Core.API.Response (ResContent (..))
 import Hreq.Core.API.Internal ((:>))
-import Hreq.Core.API.MediaType (MediaDecode, MediaEncode, HasMediaType)
+import Hreq.Core.API.MediaType (HasMediaType, MediaDecode, MediaEncode)
+import Hreq.Core.API.Request (ReqContent (..))
+import Hreq.Core.API.Response (ResContent (..))
 import Hreq.Core.API.Streaming (HasStreamBody)
 import Hreq.Core.API.Verb (Verb)
+import Hreq.Core.Client.BasicAuth (BasicAuthData)
 
 -- | 'ApiToReq' transforms an API type into a type level list of
 -- Request component content types.
diff --git a/hreq-core/src/Hreq/Core/Client/HasRequest.hs b/hreq-core/src/Hreq/Core/Client/HasRequest.hs
index b07ae41..982ff8d 100644
--- a/hreq-core/src/Hreq/Core/Client/HasRequest.hs
+++ b/hreq-core/src/Hreq/Core/Client/HasRequest.hs
@@ -1,25 +1,30 @@
 -- | This module provides a 'HasRequest' class that Interprets
 -- a 'ReqContent' type level list into 'Request' data
 --
-{-# LANGUAGE PatternSynonyms      #-}
+{-# LANGUAGE CPP             #-}
+{-# LANGUAGE PatternSynonyms #-}
 module Hreq.Core.Client.HasRequest where
 
 import Prelude ()
 import Prelude.Compat
 
-import Data.Kind
 import Data.Hlist
+import Data.Kind
 import Data.Proxy
 import Data.Singletons
+#if MIN_VERSION_base(4,18,0)
+import GHC.TypeLits hiding (withKnownNat, withKnownSymbol)
+#else
 import GHC.TypeLits
+#endif
+import Data.List (intersperse)
 import Data.String (fromString)
 import Data.String.Conversions (cs)
-import Data.List (intersperse)
 import qualified Data.Text as T (concat)
 
 import Hreq.Core.API
-import Hreq.Core.Client.Request
 import Hreq.Core.Client.BasicAuth
+import Hreq.Core.Client.Request
 import Network.HTTP.Types (QueryItem)
 
 pattern Empty :: Hlist '[]
diff --git a/hreq-core/src/Hreq/Core/Client/HasResponse.hs b/hreq-core/src/Hreq/Core/Client/HasResponse.hs
index 3818873..86eb192 100644
--- a/hreq-core/src/Hreq/Core/Client/HasResponse.hs
+++ b/hreq-core/src/Hreq/Core/Client/HasResponse.hs
@@ -3,15 +3,21 @@
 --
 -- For instance @Verb GET '[]@ gets interpreted as an empty response of type Unit i.e @()@
 --
+{-# LANGUAGE CPP #-}
 module Hreq.Core.Client.HasResponse where
 
+import Control.Monad (unless, when)
 import Control.Monad.Except
-import Data.Kind
 import Data.Hlist
+import Data.Kind
+import qualified Data.List.NonEmpty as NE
 import Data.Proxy
 import Data.Singletons
-import qualified Data.List.NonEmpty as NE
+#if MIN_VERSION_base(4,18,0)
+import GHC.TypeLits hiding (withKnownNat)
+#else
 import GHC.TypeLits
+#endif
 import Network.HTTP.Types (hContentType)
 
 import Hreq.Core.API
@@ -141,8 +147,8 @@ decodeAsBody _ response = do
     . throwError $ UnsupportedContentType (NE.head accepts) response
 
   case mediaDecode ctypProxy (resBody response) of
-     Left err -> throwError $ DecodeFailure (unDecodeError err) response
-     Right val -> pure val
+    Left err  -> throwError $ DecodeFailure (unDecodeError err) response
+    Right val -> pure val
   where
     ctypProxy :: Proxy ctyp
     ctypProxy = Proxy
@@ -185,7 +191,7 @@ decodeAsHlist srs response = case srs of
     when (rcode /= expectedCode) $ throwError (InvalidStatusCode response)
 
     decodeAsHlist xs response
- 
+
   -- Should never match because we have a class instance
   -- that triggers a type error when 'Raw' is in a non-singleton
   -- type level list
diff --git a/hreq-core/src/Hreq/Core/Client/Internal.hs b/hreq-core/src/Hreq/Core/Client/Internal.hs
index 6901f3a..2e48a9b 100644
--- a/hreq-core/src/Hreq/Core/Client/Internal.hs
+++ b/hreq-core/src/Hreq/Core/Client/Internal.hs
@@ -5,6 +5,7 @@
 module Hreq.Core.Client.Internal where
 
 import Control.Monad.Except
+import Control.Monad.IO.Class (liftIO)
 import Data.Proxy
 
 import Hreq.Core.API
diff --git a/hreq-core/src/Hreq/Core/Client/RunClient.hs b/hreq-core/src/Hreq/Core/Client/RunClient.hs
index 83ae267..33f61e4 100644
--- a/hreq-core/src/Hreq/Core/Client/RunClient.hs
+++ b/hreq-core/src/Hreq/Core/Client/RunClient.hs
@@ -35,16 +35,16 @@ instance Monad (ClientPure state)  where
 
   m >>= f = case m of
     RunClient r x -> setHttpRequest r $ f x
-    Throw e     -> Throw e
+    Throw e       -> Throw e
 
 instance Applicative (ClientPure state) where
   pure = RunClient defaultRequest
 
   f <*> x = case x of
-    Throw e     -> Throw e
+    Throw e       -> Throw e
     RunClient r y -> setHttpRequest r $ fmap ( $ y) f
 
 setHttpRequest :: Request -> ClientPure state a -> ClientPure state a
 setHttpRequest r h = case h of
   RunClient _ rs -> RunClient r rs
-  Throw e      -> Throw e
+  Throw e        -> Throw e