diff --git a/puzzle-draw.cabal b/puzzle-draw.cabal
index 7b96a7f..41e0c10 100644
--- a/puzzle-draw.cabal
+++ b/puzzle-draw.cabal
@@ -67,7 +67,7 @@ library
         diagrams-lib >=1.4.2.3 && <1.5,
         parsec >=3.1,
         yaml >=0.8.4,
-        aeson >=0.7,
+        aeson >=2.0,
         unordered-containers >=0.2,
         containers >=0.5,
         hashable >=1.2,
@@ -97,7 +97,7 @@ executable drawpuzzle
         diagrams-lib >=1.4.2.3 && <1.5,
         yaml >=0.8.4,
         optparse-applicative >=0.12,
-        aeson >=0.7,
+        aeson >=2.0,
         filepath >=1.3,
         bytestring >=0.10,
         diagrams-rasterific >=1.4.2,
@@ -113,7 +113,7 @@ executable checkpuzzle
         yaml >=0.8.4,
         containers >=0.5,
         optparse-applicative >=0.12,
-        aeson >=0.7,
+        aeson >=2.0,
         bytestring >=0.10,
         filepath >=1.3
 
@@ -128,7 +128,7 @@ executable servepuzzle
         snap-core >=0.9,
         snap-server >=0.9,
         diagrams-lib >=1.2,
-        aeson >=0.7,
+        aeson >=2.0,
         yaml >=0.8.4,
         filepath >=1.3,
         directory >=1.2,
diff --git a/src/Parse/Util.hs b/src/Parse/Util.hs
index e2f0708..5731906 100644
--- a/src/Parse/Util.hs
+++ b/src/Parse/Util.hs
@@ -32,6 +32,7 @@ import Data.Ord (comparing)
 import qualified Data.Text as T
 import Data.Traversable (mapM)
 import Data.Yaml
+import qualified Data.Aeson.Key
 import Parse.Parsec
 import Text.Read (readMaybe)
 import Prelude hiding (mapM)
@@ -39,11 +40,11 @@ import Prelude hiding (mapM)
 type Path = [String]
 
 field :: Path -> Value -> Parser Value
-field = field' . map T.pack
+field = field' . map (Data.Aeson.Key.fromText . T.pack)
   where
     field' [] v = pure v
     field' (f : fs) (Object v) = v .: f >>= field' fs
-    field' (f : _) _ = fail $ "expected field '" ++ T.unpack f ++ "'"
+    field' (f : _) _ = fail $ "expected field '" ++ (T.unpack . Data.Aeson.Key.toText $ f) ++ "'"
 
 parseFrom :: Path -> (Value -> Parser b) -> Value -> Parser b
 parseFrom fs p v =