diff --git a/src/Data/Aviation/Stratux/Websockets.hs b/src/Data/Aviation/Stratux/Websockets.hs
--- a/src/Data/Aviation/Stratux/Websockets.hs
+++ b/src/Data/Aviation/Stratux/Websockets.hs
@@ -16,8 +16,8 @@
 import qualified Data.Aeson as A(eitherDecode, eitherDecode')
 import Control.Concurrent(forkIO)
 import Control.Monad(Monad((>>=), (>>)), forever, unless)
-import Control.Monad.Trans.Either(EitherT(EitherT))
 import Control.Monad.Trans.Reader(ReaderT(ReaderT))
+import Control.Monad.Trans.Except(ExceptT(ExceptT))
 import Data.Aviation.Stratux.Types(Traffic)
 import Data.Either(Either)
 import Data.Function(($))
@@ -46,17 +46,17 @@
 -- Parses immediately, but defers conversion.
 decode ::
   FromJSON a =>
-  WSConnectionIO (EitherT String) a
+  WSConnectionIO (ExceptT String) a
 decode =
-  decodeWith A.eitherDecode EitherT
+  decodeWith A.eitherDecode ExceptT
 
 -- | Decode from JSON anything received on the websocket.
 -- Parses and performs conversion immediately.
 decode' ::
   FromJSON a =>
-  WSConnectionIO (EitherT String) a
+  WSConnectionIO (ExceptT String) a
 decode' =
-  decodeWith A.eitherDecode' EitherT
+  decodeWith A.eitherDecode' ExceptT
 
 -- | A stratux websockets application. Loops receiving data and waits for input
 -- from stdin. An empty line to stdin terminates the program loop.
diff --git a/stratux-websockets.cabal b/stratux-websockets.cabal
--- a/stratux-websockets.cabal
+++ b/stratux-websockets.cabal
@@ -1,5 +1,5 @@
 name:               stratux-websockets
-version:            0.0.10
+version:            0.0.11
 license:            BSD3
 license-file:       LICENCE
 author:             Tony Morris <ʇǝu˙sıɹɹoɯʇ@ןןǝʞsɐɥ>
@@ -24,10 +24,10 @@
 
   build-depends:
                       base >= 4 && < 6
-                    , stratux-types >= 0.0.10 && < 0.1
+                    , stratux-types >= 0.0.11 && < 0.1
                     , websockets >= 0.9 && < 1.0
                     , transformers >= 0.4 && < 1.0
-                    , aeson >= 1.0 && < 1.1
+                    , aeson >= 1.0 && < 1.5
                     , either >= 4.0 && < 5.0
                     , text >= 1.2 && < 2.0
                     , network >= 2.6 && < 3.0