diff --git a/json-spec-elm-servant.cabal b/json-spec-elm-servant.cabal
--- a/json-spec-elm-servant.cabal
+++ b/json-spec-elm-servant.cabal
@@ -1,6 +1,6 @@
 cabal-version:       3.0
 name:                json-spec-elm-servant
-version:             0.4.0.1
+version:             0.4.0.2
 synopsis:            Generated elm code for servant APIs.
 description:         Generate Elm encoders, decoders, and API requests
                      for an Servant API, where the shape of the data
@@ -26,7 +26,7 @@
     , base          >= 4.19.0.0 && < 4.20
     , containers    >= 0.6.8    && < 0.7
     , elm-syntax    >= 0.3.3.0  && < 0.4
-    , json-spec     >= 0.3.0.0  && < 0.4
+    , json-spec     >= 0.3.0.0  && < 0.6
     , servant       >= 0.20.1   && < 0.21
     , text          >= 2.1      && < 2.2
 
diff --git a/test/Api.hs b/test/Api.hs
--- a/test/Api.hs
+++ b/test/Api.hs
@@ -50,11 +50,11 @@
 import Data.Aeson (FromJSON, FromJSONKey, ToJSON, ToJSONKey)
 import Data.Binary (Binary)
 import Data.ByteString (ByteString)
-import Data.JsonSpec (Field(Field, unField),
-  HasJsonDecodingSpec(DecodingSpec, fromJSONStructure),
-  HasJsonEncodingSpec(EncodingSpec, toJSONStructure), SpecJSON(SpecJSON),
-  Specification(JsonArray, JsonDateTime, JsonEither, JsonInt, JsonLet,
-  JsonObject, JsonRef, JsonString, JsonTag), Tag(Tag))
+import Data.JsonSpec (Field(Field), HasJsonDecodingSpec(DecodingSpec,
+  fromJSONStructure), HasJsonEncodingSpec(EncodingSpec, toJSONStructure),
+  SpecJSON(SpecJSON), Specification(JsonArray, JsonDateTime, JsonEither,
+  JsonInt, JsonLet, JsonObject, JsonRef, JsonString, JsonTag), Tag(Tag),
+  unField)
 import Data.Map (Map)
 import Data.Set (Set)
 import Data.Text (Text)