diff --git a/Aws/DynamoDb/Commands/UpdateItem.hs b/Aws/DynamoDb/Commands/UpdateItem.hs
--- a/Aws/DynamoDb/Commands/UpdateItem.hs
+++ b/Aws/DynamoDb/Commands/UpdateItem.hs
@@ -19,7 +19,15 @@
 --
 ----------------------------------------------------------------------------
 
-module Aws.DynamoDb.Commands.UpdateItem where
+module Aws.DynamoDb.Commands.UpdateItem
+    ( UpdateItem(..)
+    , updateItem
+    , AttributeUpdate(..)
+    , au
+    , UpdateAction(..)
+    , UpdateItem(..)
+    , UpdateItemResponse(..)
+    ) where
 
 -------------------------------------------------------------------------------
 import           Control.Applicative
@@ -55,7 +63,10 @@
 updateItem tn key ups = UpdateItem tn key ups def def def def
 
 
-type AttributeUpdates = [AttributeUpdate]
+-- | A helper to avoid overlapping instances for 'ToJSON'.
+newtype AttributeUpdates = AttributeUpdates {
+    getAttributeUpdates :: [AttributeUpdate]
+    }
 
 
 data AttributeUpdate = AttributeUpdate {
@@ -77,7 +88,7 @@
 
 
 instance ToJSON AttributeUpdates where
-    toJSON = object . map mk
+    toJSON = object . map mk . getAttributeUpdates
         where
           mk AttributeUpdate { auAction = UDelete, auAttr = auAttr } =
             (attrName auAttr) .= object
@@ -114,7 +125,7 @@
         object $ expectsJson uiExpect ++
           [ "TableName" .= uiTable
           , "Key" .= uiKey
-          , "AttributeUpdates" .= uiUpdates
+          , "AttributeUpdates" .= AttributeUpdates uiUpdates
           , "ReturnValues" .= uiReturn
           , "ReturnConsumedCapacity" .= uiRetCons
           , "ReturnItemCollectionMetrics" .= uiRetMet
diff --git a/Aws/S3/Commands/GetService.hs b/Aws/S3/Commands/GetService.hs
--- a/Aws/S3/Commands/GetService.hs
+++ b/Aws/S3/Commands/GetService.hs
@@ -6,9 +6,7 @@
 import           Aws.S3.Core
 import           Data.Maybe
 import           Data.Time.Format
-#if MIN_VERSION_time(1,5,0)
-import           Data.Time.Format
-#else
+#if !MIN_VERSION_time(1,5,0)
 import           System.Locale
 #endif
 import           Text.XML.Cursor  (($/), ($//), (&|))
diff --git a/Aws/S3/Commands/PutObject.hs b/Aws/S3/Commands/PutObject.hs
--- a/Aws/S3/Commands/PutObject.hs
+++ b/Aws/S3/Commands/PutObject.hs
@@ -66,7 +66,7 @@
                                             , ("x-amz-storage-class",) <$> writeStorageClass <$> poStorageClass
                                             , ("x-amz-website-redirect-location",) <$> poWebsiteRedirectLocation
                                             , ("x-amz-server-side-encryption",) <$> writeServerSideEncryption <$> poServerSideEncryption
-					    , if poAutoMakeBucket then Just ("x-amz-auto-make-bucket", "1")  else Nothing
+                                            , if poAutoMakeBucket then Just ("x-amz-auto-make-bucket", "1")  else Nothing
                                             ] ++ map( \x -> (CI.mk . T.encodeUtf8 $ T.concat ["x-amz-meta-", fst x], snd x)) poMetadata
                                , s3QOtherHeaders = map (second T.encodeUtf8) $ catMaybes [
                                               ("Expires",) . T.pack . show <$> poExpires
diff --git a/Aws/SimpleDb/Core.hs b/Aws/SimpleDb/Core.hs
--- a/Aws/SimpleDb/Core.hs
+++ b/Aws/SimpleDb/Core.hs
@@ -32,7 +32,7 @@
 
 instance C.Exception SdbError
 
-data SdbMetadata 
+data SdbMetadata
     = SdbMetadata {
         requestId :: Maybe T.Text
       , boxUsage :: Maybe T.Text
@@ -63,11 +63,11 @@
   debugServiceConfig = sdbHttpPost sdbUsEast
 
 instance DefaultServiceConfiguration (SdbConfiguration UriOnlyQuery) where
-  defServiceConfig = sdbHttpsGet sdbUsEast  
+  defServiceConfig = sdbHttpsGet sdbUsEast
   debugServiceConfig = sdbHttpGet sdbUsEast
-             
+
 sdbUsEast :: B.ByteString
-sdbUsEast = "sdb.amazonaws.com" 
+sdbUsEast = "sdb.amazonaws.com"
 
 sdbUsWest :: B.ByteString
 sdbUsWest = "sdb.us-west-1.amazonaws.com"
@@ -80,16 +80,16 @@
 
 sdbApNortheast :: B.ByteString
 sdbApNortheast = "sdb.ap-northeast-1.amazonaws.com"
-             
+
 sdbHttpGet :: B.ByteString -> SdbConfiguration qt
 sdbHttpGet endpoint = SdbConfiguration HTTP Get endpoint (defaultPort HTTP)
-                          
+
 sdbHttpPost :: B.ByteString -> SdbConfiguration NormalQuery
 sdbHttpPost endpoint = SdbConfiguration HTTP PostQuery endpoint (defaultPort HTTP)
-              
+
 sdbHttpsGet :: B.ByteString -> SdbConfiguration qt
 sdbHttpsGet endpoint = SdbConfiguration HTTPS Get endpoint (defaultPort HTTPS)
-             
+
 sdbHttpsPost :: B.ByteString -> SdbConfiguration NormalQuery
 sdbHttpsPost endpoint = SdbConfiguration HTTPS PostQuery endpoint (defaultPort HTTPS)
 
@@ -122,13 +122,13 @@
                   , ("AWSAccessKeyId", accessKeyID cr)
                   , ("SignatureMethod", amzHash ah)
                   , ("SignatureVersion", "2")]
-		  ++ maybe [] (\tok -> [("SecurityToken", tok)]) (iamToken cr)
+                  ++ maybe [] (\tok -> [("SecurityToken", tok)]) (iamToken cr)
       sq = ("Signature", Just sig) : q'
       method = sdbiHttpMethod si
       host = sdbiHost si
       path = "/"
       sig = signature cr ah stringToSign
-      stringToSign = Blaze.toByteString . mconcat $ 
+      stringToSign = Blaze.toByteString . mconcat $
                      intersperse (Blaze8.fromChar '\n')
                        [Blaze.copyByteString $ httpMethod method
                        , Blaze.copyByteString $ host
diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,9 @@
 
 NOTES: 0.14 brings potentially breaking changes
 
+-   0.14.1
+    -   Eliminate orphan instance that conflicted with aeson-1.0
+    -   Add upper bound on http-client in testsuite
 -   0.14
     -   transformers 0.5 support
     -   data-default 0.6 support (also in 0.13.1)
diff --git a/aws.cabal b/aws.cabal
--- a/aws.cabal
+++ b/aws.cabal
@@ -1,5 +1,5 @@
 Name:                aws
-Version:             0.14.0
+Version:             0.14.1
 Synopsis:            Amazon Web Services (AWS) for Haskell
 Description:         Bindings for Amazon Web Services (AWS), with the aim of supporting all AWS services. To see a high level overview of the library, see the README at <https://github.com/aristidb/aws/blob/master/README.md>.
 Homepage:            http://github.com/aristidb/aws
@@ -327,7 +327,7 @@
         base == 4.*,
         bytestring >= 0.10,
         errors >= 2.0,
-        http-client >= 0.3,
+        http-client >= 0.3 && < 0.5,
         lifted-base >= 0.2,
         monad-control >= 0.3,
         mtl >= 2.1,
@@ -388,8 +388,8 @@
         aws,
         base == 4.*,
         bytestring,
-        http-client,
-        http-client-tls,
+        http-client < 0.5,
+        http-client-tls < 0.5,
         http-types,
         resourcet,
         tasty >= 0.8,
