diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,3 +1,10 @@
+## 0.5.12.1
+
+* Make the chunked transfer-encoding detection case insensitive
+  [#303](https://github.com/snoyberg/http-client/pull/303)
+* Remove some unneeded language extensions
+* Mark older versions of GHC as unsupported
+
 ## 0.5.12
 
 * Added `requestFromURI` and `requestFromURI_` functions.
diff --git a/Network/HTTP/Client.hs b/Network/HTTP/Client.hs
--- a/Network/HTTP/Client.hs
+++ b/Network/HTTP/Client.hs
@@ -1,6 +1,4 @@
-{-# LANGUAGE DeriveFunctor #-}
 {-# LANGUAGE DeriveTraversable #-}
-{-# LANGUAGE DeriveFoldable #-}
 {-# LANGUAGE DeriveDataTypeable #-}
 {-# LANGUAGE DeriveGeneric #-}
 {-# LANGUAGE CPP #-}
diff --git a/Network/HTTP/Client/Core.hs b/Network/HTTP/Client/Core.hs
--- a/Network/HTTP/Client/Core.hs
+++ b/Network/HTTP/Client/Core.hs
@@ -1,5 +1,4 @@
 {-# LANGUAGE ScopedTypeVariables #-}
-{-# LANGUAGE CPP #-}
 {-# LANGUAGE OverloadedStrings #-}
 module Network.HTTP.Client.Core
     ( withResponse
diff --git a/Network/HTTP/Client/Headers.hs b/Network/HTTP/Client/Headers.hs
--- a/Network/HTTP/Client/Headers.hs
+++ b/Network/HTTP/Client/Headers.hs
@@ -1,6 +1,6 @@
+{-# LANGUAGE DisambiguateRecordFields #-}
 {-# LANGUAGE OverloadedStrings #-}
-{-# LANGUAGE RecordWildCards   #-}
-{-# LANGUAGE ViewPatterns      #-}
+{-# LANGUAGE ViewPatterns #-}
 module Network.HTTP.Client.Headers
     ( parseStatusHeaders
     ) where
diff --git a/Network/HTTP/Client/Manager.hs b/Network/HTTP/Client/Manager.hs
--- a/Network/HTTP/Client/Manager.hs
+++ b/Network/HTTP/Client/Manager.hs
@@ -1,9 +1,6 @@
-{-# LANGUAGE FlexibleContexts #-}
 {-# LANGUAGE OverloadedStrings #-}
-{-# LANGUAGE ScopedTypeVariables #-}
-{-# LANGUAGE CPP #-}
-{-# LANGUAGE BangPatterns #-}
 {-# LANGUAGE RankNTypes #-}
+{-# LANGUAGE ScopedTypeVariables #-}
 module Network.HTTP.Client.Manager
     ( ManagerSettings (..)
     , newManager
diff --git a/Network/HTTP/Client/MultipartFormData.hs b/Network/HTTP/Client/MultipartFormData.hs
--- a/Network/HTTP/Client/MultipartFormData.hs
+++ b/Network/HTTP/Client/MultipartFormData.hs
@@ -1,4 +1,4 @@
-{-# LANGUAGE CPP, OverloadedStrings #-}
+{-# LANGUAGE OverloadedStrings #-}
 -- | This module handles building multipart/form-data. Example usage:
 --
 -- > {-# LANGUAGE OverloadedStrings #-}
diff --git a/Network/HTTP/Client/Response.hs b/Network/HTTP/Client/Response.hs
--- a/Network/HTTP/Client/Response.hs
+++ b/Network/HTTP/Client/Response.hs
@@ -1,7 +1,5 @@
-{-# LANGUAGE RecordWildCards #-}
-{-# LANGUAGE FlexibleContexts #-}
 {-# LANGUAGE OverloadedStrings #-}
-{-# LANGUAGE CPP #-}
+{-# LANGUAGE RecordWildCards #-}
 module Network.HTTP.Client.Response
     ( getRedirectedRequest
     , getResponse
@@ -11,6 +9,8 @@
 import Data.ByteString (ByteString)
 import qualified Data.ByteString.Char8 as S8
 import qualified Data.ByteString.Lazy as L
+import qualified Data.CaseInsensitive as CI
+import Control.Arrow (second)
 
 import Data.Monoid (mempty)
 
@@ -88,7 +88,7 @@
     let conn = managedResource mconn
     StatusHeaders s version hs <- parseStatusHeaders conn timeout' cont
     let mcl = lookup "content-length" hs >>= readDec . S8.unpack
-        isChunked = ("transfer-encoding", "chunked") `elem` hs
+        isChunked = ("transfer-encoding", CI.mk "chunked") `elem` map (second CI.mk) hs
 
         -- should we put this connection back into the connection manager?
         toPut = Just "close" /= lookup "connection" hs && version > W.HttpVersion 1 0
diff --git a/Network/HTTP/Client/Types.hs b/Network/HTTP/Client/Types.hs
--- a/Network/HTTP/Client/Types.hs
+++ b/Network/HTTP/Client/Types.hs
@@ -1,7 +1,5 @@
 {-# LANGUAGE CPP #-}
 {-# LANGUAGE DeriveDataTypeable #-}
-{-# LANGUAGE DeriveFoldable #-}
-{-# LANGUAGE DeriveFunctor #-}
 {-# LANGUAGE DeriveTraversable #-}
 {-# LANGUAGE RankNTypes #-}
 {-# LANGUAGE OverloadedStrings #-}
diff --git a/Network/HTTP/Client/Util.hs b/Network/HTTP/Client/Util.hs
--- a/Network/HTTP/Client/Util.hs
+++ b/Network/HTTP/Client/Util.hs
@@ -1,9 +1,5 @@
-{-# LANGUAGE CPP #-}
-{-# LANGUAGE DeriveDataTypeable #-}
 {-# LANGUAGE OverloadedStrings #-}
-{-# LANGUAGE FlexibleContexts #-}
 {-# LANGUAGE ScopedTypeVariables #-}
-{-# LANGUAGE TupleSections #-}
 module Network.HTTP.Client.Util
     ( readDec
     ) where
diff --git a/http-client.cabal b/http-client.cabal
--- a/http-client.cabal
+++ b/http-client.cabal
@@ -1,5 +1,5 @@
 name:                http-client
-version:             0.5.12
+version:             0.5.12.1
 synopsis:            An HTTP client engine
 description:         Hackage documentation generation is not reliable. For up to date documentation, please see: <http://www.stackage.org/package/http-client>.
 homepage:            https://github.com/snoyberg/http-client
@@ -65,6 +65,10 @@
 
   if !impl(ghc>=8.0)
     build-depends: semigroups >= 0.16.1
+
+  -- See build failure at https://travis-ci.org/snoyberg/http-client/jobs/359573631
+  if impl(ghc < 7.10)
+    buildable: False
 
   if os(mingw32)
     build-depends: Win32, safe