diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+#### 0.10.0.4
+
+* Drops `aeson-utils` dependency in favor of `scientific >= 0.3.2`
+
 #### 0.10.0.3
 
 * Allow `mtl == 2.2.*`
diff --git a/rest-gen.cabal b/rest-gen.cabal
--- a/rest-gen.cabal
+++ b/rest-gen.cabal
@@ -1,5 +1,5 @@
 name:                rest-gen
-version:             0.10.0.3
+version:             0.10.0.4
 description:         Documentation and client generation from rest definition.
 synopsis:            Documentation and client generation from rest definition.
 maintainer:          code@silk.co
@@ -50,7 +50,6 @@
     , Cabal >= 1.18 && < 1.22
     , HStringTemplate >= 0.6 && < 0.8
     , aeson >= 0.7 && < 0.8
-    , aeson-utils == 0.2.*
     , attoparsec >= 0.10 && < 0.12
     , blaze-html >= 0.5 && < 0.8
     , bytestring >= 0.9 && < 0.11
@@ -72,6 +71,7 @@
     , rest-core >= 0.29 && < 0.31
     , rest-types == 1.10.*
     , safe >= 0.2 && < 0.4
+    , scientific >= 0.3.2 && < 0.4
     , split >= 0.1 && < 0.3
     , tagged >= 0.2 && < 0.8
     , text >= 0.11 && < 1.2
diff --git a/src/Rest/Gen/Base/JSON/Pretty.hs b/src/Rest/Gen/Base/JSON/Pretty.hs
--- a/src/Rest/Gen/Base/JSON/Pretty.hs
+++ b/src/Rest/Gen/Base/JSON/Pretty.hs
@@ -2,20 +2,20 @@
 
 import Control.Arrow (first)
 import Data.Aeson.Types
-import Data.Aeson.Utils (parseNumber)
 import Data.Char
 import Data.HashMap.Strict (HashMap)
+import Data.Scientific (floatingOrInteger)
 import Data.Text (Text, unpack)
 import Numeric
 import Text.PrettyPrint.HughesPJ hiding (first)
 import qualified Data.HashMap.Strict as H
-import qualified Data.Vector as V
+import qualified Data.Vector         as V
 
 pp_value         :: Value -> Doc
 pp_value v        = case v of
     Null      -> pp_null
     Bool x    -> pp_boolean x
-    Number x  -> pp_number (parseNumber x)
+    Number x  -> pp_number . either Right Left . floatingOrInteger $ x
     String x  -> pp_js_string (unpack x)
     Array vs  -> pp_array $ V.toList vs
     Object xs -> pp_js_object xs