diff --git a/pagerduty.cabal b/pagerduty.cabal
--- a/pagerduty.cabal
+++ b/pagerduty.cabal
@@ -1,5 +1,5 @@
 name:                  pagerduty
-version:               0.0.1.1
+version:               0.0.2
 synopsis:              Client library for PagerDuty Integration and REST APIs.
 homepage:              http://github.com/brendanhay/pagerduty
 license:               OtherLicense
@@ -86,10 +86,11 @@
       , lens-aeson            >= 1
       , mmorph                >= 1       && < 2
       , monad-control         >= 1       && < 2
-      , mtl                   >= 2.2.1   && < 2.3
+      , mtl                   >= 2.1.3.1
       , template-haskell      >= 2.2
       , text                  >= 1.1
       , time                  >= 1.5
-      , transformers          == 0.4.*
+      , transformers          >= 0.2
+      , transformers-compat   >= 0.3
       , transformers-base     >= 0.4.2
       , unordered-containers  >= 0.2.3
diff --git a/src/Control/Monad/Trans/PagerDuty.hs b/src/Control/Monad/Trans/PagerDuty.hs
--- a/src/Control/Monad/Trans/PagerDuty.hs
+++ b/src/Control/Monad/Trans/PagerDuty.hs
@@ -44,10 +44,11 @@
 import           Control.Applicative
 import           Control.Monad.Base
 import           Control.Monad.Catch
-import           Control.Monad.Except
+import           Control.Monad.Error              (MonadError (..))
 import           Control.Monad.Morph
 import           Control.Monad.Reader
 import           Control.Monad.Trans.Control
+import           Control.Monad.Trans.Except
 import           Data.Aeson
 import           Data.Conduit
 import           Network.PagerDuty.Integration    (Event, Response)