diff --git a/library/Magicbane.hs b/library/Magicbane.hs
--- a/library/Magicbane.hs
+++ b/library/Magicbane.hs
@@ -29,7 +29,7 @@
 import           Network.HTTP.Link as X hiding (Link)
 import           Network.HTTP.Types as X hiding (Header)
 import           Network.Wai as X (Application, Middleware)
-import           Network.Wai.Cli as X hiding (port)
+import           Network.Wai.Cli as X
 import           Magicbane.App as X hiding (Or)
 import           Magicbane.Config as X
 import           Magicbane.Has as X
diff --git a/library/Magicbane/App.hs b/library/Magicbane/App.hs
--- a/library/Magicbane/App.hs
+++ b/library/Magicbane/App.hs
@@ -1,4 +1,4 @@
-{-# LANGUAGE NoImplicitPrelude, UnicodeSyntax, TypeApplications, ScopedTypeVariables, CPP #-}
+{-# LANGUAGE NoImplicitPrelude, UnicodeSyntax, TypeApplications, ScopedTypeVariables, CPP, TypeOperators, FlexibleContexts #-}
 
 -- | Extends Servant with context, based on RIO.
 --   The context should be a tuple of all your moudles and configs and stuff, so that the Data.Has module would let you access these items by type.
@@ -18,6 +18,6 @@
 runMagicbaneHandler ctx a = Servant.Handler $ ExceptT $ try $ runReaderT (unRIO a) ctx
 
 -- | Constructs a WAI application from an API definition, a Servant context (used for auth mainly), the app context and the actual action handlers.
-magicbaneApp ∷ forall β χ ψ. (HasServer χ ψ) ⇒ Proxy χ → Context ψ → β → ServerT χ (RIO β) → Application
+magicbaneApp ∷ forall β χ ψ. (HasServer χ ψ, HasContextEntry (ψ .++ DefaultErrorFormatters) ErrorFormatters) ⇒ Proxy χ → Context ψ → β → ServerT χ (RIO β) → Application
 magicbaneApp api sctx ctx actions = serveWithContext api sctx $ srv ctx
   where srv c = hoistServerWithContext api (Proxy @ψ) (runMagicbaneHandler c) actions
diff --git a/library/Magicbane/Util.hs b/library/Magicbane/Util.hs
--- a/library/Magicbane/Util.hs
+++ b/library/Magicbane/Util.hs
@@ -94,11 +94,11 @@
           T.filter (`onotElem` ("!^*?()[]{}`./\\'\"~|"::String)) .
           T.toLower . T.strip
 
--- | Creates a simple text/plain ServantErr.
-errText ∷ ServantErr → L.ByteString → ServantErr
+-- | Creates a simple text/plain ServerError
+errText ∷ ServerError → L.ByteString → ServerError
 errText e t = e { errHeaders = [ (hContentType, "text/plain; charset=utf-8") ]
                 , errBody    = t }
 
--- | Creates and throws a simple text/plain ServantErr.
-throwErrText ∷ MonadThrow μ ⇒ ServantErr → L.ByteString → μ α
+-- | Creates and throws a simple text/plain ServerError.
+throwErrText ∷ MonadThrow μ ⇒ ServerError → L.ByteString → μ α
 throwErrText e t = throwM $ errText e t
diff --git a/magicbane.cabal b/magicbane.cabal
--- a/magicbane.cabal
+++ b/magicbane.cabal
@@ -1,11 +1,13 @@
--- This file has been generated from package.yaml by hpack version 0.28.2.
+cabal-version: 1.12
+
+-- This file has been generated from package.yaml by hpack version 0.34.2.
 --
 -- see: https://github.com/sol/hpack
 --
--- hash: fc096cdac0f766409152087a8e14aa8f6fb03ec3925e6b49f1c29e3feaa5e600
+-- hash: 9ccf29b1676abbc411ffa8622c3786b3bf156e6c1d2e17720bbc4717a5179941
 
 name:           magicbane
-version:        0.4.0
+version:        0.5.0
 synopsis:       A web framework that integrates Servant, RIO, EKG, fast-logger, wai-cli…
 
 description:    Inspired by Dropwizard, Magicbane provides a packaged framework for developing web services using the best available libraries, including Servant, RIO, Aeson, EKG/monad-metrics, fast-logger, wai-cli and others.
@@ -16,9 +18,8 @@
 maintainer:     greg@unrelenting.technology
 copyright:      2017-2018 Greg V <greg@unrelenting.technology>
 license:        PublicDomain
-tested-with:    GHC==8.4.2
+tested-with:    GHC==8.6.5
 build-type:     Simple
-cabal-version:  >= 1.10
 
 source-repository head
   type: git
@@ -60,7 +61,7 @@
     , refined
     , rio
     , rio-orphans
-    , servant-server >=0.12
+    , servant-server >=0.18
     , split
     , string-conversions
     , text