diff --git a/postmark.cabal b/postmark.cabal
--- a/postmark.cabal
+++ b/postmark.cabal
@@ -1,5 +1,5 @@
 Name:               postmark
-Version:            0.1.0
+Version:            0.1.1
 License:            BSD3
 License-File:       LICENSE
 Author:             Mark Hibberd <mark@hibberd.id.au>
@@ -32,12 +32,10 @@
                     , attoparsec                    >= 0.10
                     , bytestring                    >= 0.9
                     , containers                    >= 0.4
-                    , http-conduit                  >= 1.4
                     , http-types                    >= 0.6
-                    , time                          >= 1.2
-                    , timerep                       >= 1.0.3
                     , text                          >= 0.11
-                    , network-api-support           >= 0.0.3
+                    , network-api-support           >= 0.1.0
+                    , http-client-tls               >= 0.2.1.1
 
 
   GHC-Options:
diff --git a/src/Network/Api/Postmark/Core.hs b/src/Network/Api/Postmark/Core.hs
--- a/src/Network/Api/Postmark/Core.hs
+++ b/src/Network/Api/Postmark/Core.hs
@@ -14,7 +14,7 @@
 import Network.Api.Postmark.Request
 import Network.Api.Postmark.Response
 import Network.Api.Postmark.Settings
-import Network.HTTP.Conduit
+import Network.HTTP.Client.TLS
 import Network.HTTP.Types
 
 -- * Api endpoints
@@ -34,7 +34,7 @@
 -- | Run the specified request with the specified settings.
 request :: PostmarkSettings -> PostmarkRequest e a -> IO (PostmarkResponse e a)
 request settings (PostmarkRequest stdmethod url transform) =
-  runRequest def stdmethod (apiUrl settings <> url) (
+  runRequest tlsManagerSettings stdmethod (apiUrl settings <> url) (
     addHeader ("Accept", "application/json") <>
     addHeader ("X-Postmark-Server-Token", encodeUtf8 $  apiToken settings) <>
     transform
diff --git a/src/Network/Api/Postmark/Request.hs b/src/Network/Api/Postmark/Request.hs
--- a/src/Network/Api/Postmark/Request.hs
+++ b/src/Network/Api/Postmark/Request.hs
@@ -10,7 +10,7 @@
 import Network.HTTP.Types
 
 data PostmarkRequest e a where
-  PostmarkRequest :: (FromJSON e, FromJSON a) => StdMethod -> Text -> RequestTransformer IO -> PostmarkRequest e a
+  PostmarkRequest :: (FromJSON e, FromJSON a) => StdMethod -> Text -> RequestTransformer -> PostmarkRequest e a
 
 type PostmarkRequest' a =
   PostmarkRequest PostmarkError a