diff --git a/src/Mapper.hs b/src/Mapper.hs
index 75537fd..3f2e4c6 100644
--- a/src/Mapper.hs
+++ b/src/Mapper.hs
@@ -38,7 +38,7 @@ import Data.Map (toList)
 import Data.Word (Word8)
 import Control.Monad.State
 import Codec.Midi (Key)
-import Dhall hiding (maybe)
+import Dhall hiding (maybe, map)
 
 import Chord (Chord(..)
              , chordTonesTensionAsPassing
@@ -67,7 +67,7 @@ data ChordMapConfig
   | Deg DegreeChord
   deriving (Show, Generic)
 
-instance Interpret ChordMapConfig where
+instance FromDhall ChordMapConfig where
   autoWith _ =
     Dhall.union
       (  ( constructor "Abs" (Abs <$> Dhall.auto))
@@ -104,12 +104,12 @@ data FullConfig = FullConfig
   , specialInputs   :: [SpecialInput]
   } deriving (Show, Generic)
 
-instance Dhall.Interpret AbsoluteChord
-instance Dhall.Interpret DegreeChord
-instance Dhall.Interpret ChordMapEntry
-instance Dhall.Interpret ChordMapSet
-instance Dhall.Interpret SpecialInput
-instance Dhall.Interpret FullConfig
+instance Dhall.FromDhall AbsoluteChord
+instance Dhall.FromDhall DegreeChord
+instance Dhall.FromDhall ChordMapEntry
+instance Dhall.FromDhall ChordMapSet
+instance Dhall.FromDhall SpecialInput
+instance Dhall.FromDhall FullConfig
 
 
 mapperMain :: IO ()
diff --git a/stack.yaml b/stack.yaml
index 8458380..767e34c 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -20,7 +20,7 @@
 # snapshot:
 #   url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/23/21.yaml
 
-snapshot: lts-14.27
+snapshot: lts-23.27
 
 # User packages to be built.
 # Various formats can be used as shown in the example below.
@@ -47,16 +47,14 @@ packages:
 # extra-deps: []
 extra-deps:
 - PortMidi-0.2.0.0
-- arrows-0.4.4.2
-- Stream-0.4.7.2
-- lazysmallcheck-0.6
-- monomer-1.3.0.0
+- monomer-1.6.0.1
 - nanovg-0.8.1.0
-- c2hs-0.28.8
-- language-c-0.10.0
+- sdl2-2.5.5.1
 
 # Override default flag values for project packages and extra-deps
-# flags: {}
+flags:
+  sdl2:
+    recent-ish: false
 
 # Extra package databases containing global packages
 # extra-package-dbs: []