diff --git a/CHANGES.md b/CHANGES.md
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,7 +1,13 @@
+## 0.4.0.0 (2017-12-20)
+
+ * Use req instead of wreq. Thanks to David Smith
+ * Relax constraints to work with GHC-8.2.x / LTS-10.x. Thanks to Kris Jenkins
+ * Better formatting or README. Thanks to Brady Ouren
+ 
 ## 0.3.1.1 (2017-07-13)
  
  * Error handling. Thanks to Kris Jenkins.
 
-## 0.2.0.0 (2017-04-13)
+## 0.3.0.0 (2017-04-13)
 
  * Initial release.
diff --git a/System/Metrics/Json.hs b/System/Metrics/Json.hs
--- a/System/Metrics/Json.hs
+++ b/System/Metrics/Json.hs
@@ -15,6 +15,7 @@
       -- ** Conversion functions
     , sampleToJson
     , valueToJson
+    , bulkRequestBody
 
       -- ** Generated Lenses
     , beat, timestamp, beatTags, ekg, rtt
@@ -37,8 +38,6 @@
 import           Data.Time.Clock.POSIX       (POSIXTime)
 import           GHC.Generics                (Generic)
 
-import           Network.HTTP.Client         (RequestBody (..), requestBody)
-import           Network.Wreq.Types
 import qualified System.Metrics              as Metrics
 import qualified System.Metrics.Distribution as Distribution
 
@@ -125,11 +124,11 @@
 -- | Make a bulk submission to elasticsearch
 newtype BulkRequest = BulkRequest [(CreateBulk, BeatEvent)]
 
-instance Postable BulkRequest where
-  postPayload (BulkRequest docs) req = return $ req { requestBody = RequestBodyLBS body}
-    where
-      body = (<> "\n") . LBS.intercalate "\n" . concatMap encodeBoth $ docs
-      encodeBoth (cb, be) = [A.encode cb, A.encode be]
+bulkRequestBody :: BulkRequest -> LBS.ByteString
+bulkRequestBody (BulkRequest docs) =
+  (<> "\n") . LBS.intercalate "\n" . concatMap encodeBoth $ docs
+  where
+    encodeBoth (cb, be) = [A.encode cb, A.encode be]
 
 --------------------------------------------------------------------------------
 -- | Generate the nested json for a 'Mertics.Sample'
diff --git a/System/Remote/Monitoring/ElasticSearch.hs b/System/Remote/Monitoring/ElasticSearch.hs
--- a/System/Remote/Monitoring/ElasticSearch.hs
+++ b/System/Remote/Monitoring/ElasticSearch.hs
@@ -1,4 +1,5 @@
 {-# LANGUAGE CPP                 #-}
+{-# LANGUAGE DataKinds           #-}
 {-# LANGUAGE OverloadedStrings   #-}
 {-# LANGUAGE RecordWildCards     #-}
 {-# LANGUAGE ScopedTypeVariables #-}
@@ -29,6 +30,7 @@
 import           Control.Exception     (catch)
 import           Control.Lens
 import           Control.Monad         (forever, void)
+import           Data.Default.Class    (def)
 import qualified Data.HashMap.Strict   as M
 import           Data.Int              (Int64)
 import           Data.Monoid           ((<>))
@@ -39,8 +41,9 @@
 import           Data.Time.Clock.POSIX (getPOSIXTime)
 import           Data.Time.Format      (defaultTimeLocale, formatTime)
 import           Network.HostName      (getHostName)
-import           Network.HTTP.Client   (HttpException)
-import           Network.Wreq          as Wreq
+import           Network.HTTP.Req      (HttpException, POST (..),
+                                        ReqBodyLbs (..), Scheme (Http), runReq)
+import qualified Network.HTTP.Req      as Req
 import qualified System.Metrics        as Metrics
 
 import           System.Metrics.Json
@@ -157,8 +160,8 @@
 
 --------------------------------------------------------------------------------
 -- | Construct the correct URL to send metrics too from '_host' and '_port'
-elasticURL :: ESOptions -> String
-elasticURL eo = "http://" ++ (eo ^. host.unpacked) ++ ":" ++ show (eo ^. port) ++ "/_bulk"
+elasticURL :: ESOptions -> Req.Url 'Http
+elasticURL eo = Req.http . T.pack $ (eo ^. host.unpacked) <> ":" ++ show (eo ^. port) <> "/_bulk"
 
 -- | Construct the index to send to
 --
@@ -193,5 +196,10 @@
 flushSample store eo = do
   createBulk <- mkIndex eo
   bulkEvts <- sampleBeatEvents store eo
-  (void $ Wreq.post (elasticURL eo) $ BulkRequest $ (createBulk, ) <$> bulkEvts) `catch`
-    (_onError eo)
+  let body = ReqBodyLbs . bulkRequestBody . BulkRequest $ (createBulk, ) <$> bulkEvts
+  (void . runReq def $ Req.req POST
+    (elasticURL eo)
+    body
+    Req.ignoreResponse
+    mempty)
+    `catch` _onError eo
diff --git a/ekg-elasticsearch.cabal b/ekg-elasticsearch.cabal
--- a/ekg-elasticsearch.cabal
+++ b/ekg-elasticsearch.cabal
@@ -1,5 +1,5 @@
 name:                ekg-elasticsearch
-version:             0.3.1.1
+version:             0.4.0.0
 synopsis:            Push metrics to elasticsearch
 description:
   This library lets you push system metrics to a elasticsearch server.
@@ -19,17 +19,18 @@
     System.Remote.Monitoring.ElasticSearch
     System.Metrics.Json
 
-  build-depends: base >= 4.5 && < 4.10
+  build-depends: base >= 4.5 && < 4.11
                , bytestring < 1.0
+               , data-default-class
                , ekg-core >= 0.1 && < 1.0
                , aeson >= 1.0
                , hostname >= 1.0
                , http-client >= 0.5
                , lens >= 4.15.1
+               , req >= 1.0
                , text < 1.3
-               , time < 1.7
+               , time < 1.9
                , unordered-containers < 0.3
-               , wreq
 
   default-language:    Haskell2010