diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+#### 0.4.0.5
+
+* Allow `aeson-utils 0.3.*`
+
 #### 0.4.0.4
 
 * Allow utf8-string 1.
diff --git a/rest-client.cabal b/rest-client.cabal
--- a/rest-client.cabal
+++ b/rest-client.cabal
@@ -1,5 +1,5 @@
 name:                rest-client
-version:             0.4.0.4
+version:             0.4.0.5
 description:         Utility library for use in generated API client libraries.
 synopsis:            Utility library for use in generated API client libraries.
 maintainer:          code@silk.co
@@ -25,7 +25,7 @@
     Rest.Client.Internal
   build-depends:
       base == 4.*
-    , aeson-utils >= 0.2.1 && < 0.3
+    , aeson-utils >= 0.2.1 && < 0.4
     , bytestring >= 0.9 && < 0.11
     , case-insensitive >= 0.4 && < 1.3
     , data-default == 0.5.*