diff --git a/slack-web.cabal b/slack-web.cabal
--- a/slack-web.cabal
+++ b/slack-web.cabal
@@ -1,5 +1,5 @@
 name: slack-web
-version: 0.2.0.1
+version: 0.2.0.2
 
 build-type: Simple
 cabal-version: >= 1.21
@@ -50,8 +50,9 @@
     , http-api-data >= 0.3 && < 0.4
     , http-client >= 0.5 && < 0.6
     , http-client-tls >= 0.3 && < 0.4
-    , servant >= 0.9 && < 0.12
-    , servant-client >= 0.9 && < 0.12
+    , servant >= 0.12 && < 0.13
+    , servant-client >= 0.12 && < 0.13
+    , servant-client-core >= 0.12 && < 0.13
     , text >= 1.2 && < 1.3
     , transformers
     , mtl
diff --git a/src/Web/Slack.hs b/src/Web/Slack.hs
--- a/src/Web/Slack.hs
+++ b/src/Web/Slack.hs
@@ -64,8 +64,9 @@
 import Servant.API
 
 -- servant-client
-import Servant.Client
-import Servant.Common.Req (Req, appendToQueryString)
+import Servant.Client hiding (Response, baseUrl)
+import Servant.Client.Core (Request, appendToQueryString, ServantError)
+import Servant.Client.Core.Internal.Auth
 
 -- slack-web
 import qualified Web.Slack.Api as Api
@@ -214,7 +215,7 @@
   run (authTest_ authR)
 
 authTest_
-  :: AuthenticateReq (AuthProtect "token")
+  :: AuthenticatedRequest (AuthProtect "token")
   -> ClientM (ResponseJSON Auth.TestRsp)
 
 
@@ -233,7 +234,7 @@
   run (channelsCreate_ authR createReq)
 
 channelsCreate_
-  :: AuthenticateReq (AuthProtect "token")
+  :: AuthenticatedRequest (AuthProtect "token")
   -> Channel.CreateReq
   -> ClientM (ResponseJSON Channel.CreateRsp)
 
@@ -252,7 +253,7 @@
   run (channelsList_ authR listReq)
 
 channelsList_
-  :: AuthenticateReq (AuthProtect "token")
+  :: AuthenticatedRequest (AuthProtect "token")
   -> Channel.ListReq
   -> ClientM (ResponseJSON Channel.ListRsp)
 
@@ -272,7 +273,7 @@
   run (channelsHistory_ authR histReq)
 
 channelsHistory_
-  :: AuthenticateReq (AuthProtect "token")
+  :: AuthenticatedRequest (AuthProtect "token")
   -> Common.HistoryReq
   -> ClientM (ResponseJSON Common.HistoryRsp)
 
@@ -291,7 +292,7 @@
   run (chatPostMessage_ authR postReq)
 
 chatPostMessage_
-  :: AuthenticateReq (AuthProtect "token")
+  :: AuthenticatedRequest (AuthProtect "token")
   -> Chat.PostMsgReq
   -> ClientM (ResponseJSON Chat.PostMsgRsp)
 
@@ -311,7 +312,7 @@
   run (groupsList_ authR)
 
 groupsList_
-  :: AuthenticateReq (AuthProtect "token")
+  :: AuthenticatedRequest (AuthProtect "token")
   -> ClientM (ResponseJSON Group.ListRsp)
 
 -- |
@@ -332,7 +333,7 @@
   run (groupsHistory_ authR hisReq)
 
 groupsHistory_
-  :: AuthenticateReq (AuthProtect "token")
+  :: AuthenticatedRequest (AuthProtect "token")
   -> Common.HistoryReq
   -> ClientM (ResponseJSON Common.HistoryRsp)
 
@@ -350,7 +351,7 @@
   run (imList_ authR)
 
 imList_
-  :: AuthenticateReq (AuthProtect "token")
+  :: AuthenticatedRequest (AuthProtect "token")
   -> ClientM (ResponseJSON Im.ListRsp)
 
 -- |
@@ -369,7 +370,7 @@
   run (imHistory_ authR histReq)
 
 imHistory_
-  :: AuthenticateReq (AuthProtect "token")
+  :: AuthenticatedRequest (AuthProtect "token")
   -> Common.HistoryReq
   -> ClientM (ResponseJSON Common.HistoryRsp)
 
@@ -387,7 +388,7 @@
   run (mpimList_ authR)
 
 mpimList_
-  :: AuthenticateReq (AuthProtect "token")
+  :: AuthenticatedRequest (AuthProtect "token")
   -> ClientM (ResponseJSON Group.ListRsp)
 
 -- |
@@ -406,7 +407,7 @@
   run (mpimHistory_ authR histReq)
 
 mpimHistory_
-  :: AuthenticateReq (AuthProtect "token")
+  :: AuthenticatedRequest (AuthProtect "token")
   -> Common.HistoryReq
   -> ClientM (ResponseJSON Common.HistoryRsp)
 
@@ -425,7 +426,7 @@
   run (usersList_ authR)
 
 usersList_
-  :: AuthenticateReq (AuthProtect "token")
+  :: AuthenticatedRequest (AuthProtect "token")
   -> ClientM (ResponseJSON User.ListRsp)
 
 -- | Returns a function to get a username from a 'Common.UserId'.
@@ -525,8 +526,8 @@
 
 authenticateReq
   :: Text
-  -> Req
-  -> Req
+  -> Request
+  -> Request
 authenticateReq token =
   appendToQueryString "token" (Just token)
 
@@ -545,8 +546,8 @@
   unnestErrors <$> liftIO (runClientM clientAction $ ClientEnv (getManager env) baseUrl)
 
 mkSlackAuthenticateReq :: (MonadReader env m, HasToken env)
-  => m (AuthenticateReq (AuthProtect "token"))
-mkSlackAuthenticateReq = flip mkAuthenticateReq authenticateReq . getToken <$> ask
+  => m (AuthenticatedRequest (AuthProtect "token"))
+mkSlackAuthenticateReq = flip mkAuthenticatedRequest authenticateReq . getToken <$> ask
 
 unnestErrors :: Either ServantError (ResponseJSON a) -> Response a
 unnestErrors (Right (ResponseJSON (Right a))) = Right a
diff --git a/src/Web/Slack/Common.hs b/src/Web/Slack/Common.hs
--- a/src/Web/Slack/Common.hs
+++ b/src/Web/Slack/Common.hs
@@ -39,9 +39,9 @@
 -- http-api-data
 import Web.HttpApiData
 import Web.FormUrlEncoded
-  
+
 -- servant-client
-import Servant.Common.Req
+import Servant.Client
 
 -- slack-web
 import Web.Slack.Types