diff --git a/dhall-json.cabal b/dhall-json.cabal
--- a/dhall-json.cabal
+++ b/dhall-json.cabal
@@ -1,5 +1,5 @@
 Name: dhall-json
-Version: 1.0.1
+Version: 1.0.2
 Cabal-Version: >=1.8.0.2
 Build-Type: Simple
 Tested-With: GHC == 7.10.2, GHC == 8.0.1
@@ -31,7 +31,7 @@
     Build-Depends:
         base               >= 4.8.0.0  && < 5  ,
         aeson              >= 1.0.0.0  && < 1.2,
-        dhall              >= 1.0.1    && < 1.3,
+        dhall              >= 1.0.1    && < 1.4,
         neat-interpolation                < 0.4,
         text               >= 0.11.1.0 && < 1.3,
         vector
@@ -45,7 +45,7 @@
         base             >= 4.8.0.0  && < 5   ,
         aeson            >= 1.0.0.0  && < 1.2 ,
         bytestring                      < 0.11,
-        dhall            >= 1.0.1    && < 1.3 ,
+        dhall            >= 1.0.1    && < 1.4 ,
         dhall-json                            ,
         optparse-generic >= 1.1.1    && < 1.2 ,
         trifecta         >= 1.6      && < 1.7 ,
@@ -58,7 +58,7 @@
     Build-Depends:
         base             >= 4.8.0.0  && < 5   ,
         bytestring                      < 0.11,
-        dhall            >= 1.0.1    && < 1.3 ,
+        dhall            >= 1.0.1    && < 1.4 ,
         dhall-json                            ,
         optparse-generic >= 1.1.1    && < 1.2 ,
         trifecta         >= 1.6      && < 1.7 ,
diff --git a/src/Dhall/JSON.hs b/src/Dhall/JSON.hs
--- a/src/Dhall/JSON.hs
+++ b/src/Dhall/JSON.hs
@@ -27,6 +27,7 @@
     * @Text@
     * @List@s
     * @Optional@ values
+    * unions
     * records
 
     Dhall @Bool@s translate to JSON bools:
@@ -68,10 +69,27 @@
 > $ dhall-to-json <<< '{ foo = 1, bar = True }'
 > {"foo":1,"bar":true}
 
-    Note that you cannot convert Dhall unions since JSON does not support sum
-    types.  You will need to convert your unions to use the above types within
-    Dhall before translating to JSON
+    Dhall unions translate to the wrapped value:
 
+> $ dhall-to-json <<< "< Left = +2 | Right : Natural>"
+> 2
+> $ cat config
+> [ < Person = { age = +47, name = "John" }
+>   | Place  : { location : Text }
+>   >
+> , < Place  = { location = "North Pole" }
+>   | Person : { age : Natural, name : Text }
+>   >
+> , < Place  = { location = "Sahara Desert" }
+>   | Person : { age : Natural, name : Text }
+>   >
+> , < Person = { age = +35, name = "Alice" }
+>   | Place  : { location : Text }
+>   >
+> ]
+> $ dhall-to-json <<< "./config"
+> [{"age":47,"name":"John"},{"location":"North Pole"},{"location":"Sahara Desert"},{"age":35,"name":"Alice"}]
+
     Also, all Dhall expressions are normalized before translation to JSON:
 
 > $ dhall-to-json <<< "True == False"
@@ -114,8 +132,8 @@
         Data.Text.unpack [NeatInterpolation.text|
 $_ERROR: Cannot translate to JSON
 
-Explanation: Only primitive values, records, ❰List❱s, and ❰Optional❱ values can
-be translated from Dhall to JSON
+Explanation: Only primitive values, records, unions, ❰List❱s, and ❰Optional❱
+values can be translated from Dhall to JSON
 
 The following Dhall expression could not be translated to JSON:
 
@@ -161,4 +179,5 @@
         Dhall.Core.RecordLit a -> do
             a' <- traverse loop a
             return (Data.Aeson.toJSON a')
+        Dhall.Core.UnionLit _ b _ -> loop b
         _ -> Left (Unsupported e)