diff --git a/CHANGELOG.md b/CHANGELOG.md
index 125baf4..6b7ab4d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## v0.3.1 (2016-02-28)
+
+* Updated to latest version of marshalling API
+  
 ## v0.3.0 (2016-02-27)
 
 * Added support for `Encoder`/`Decoder`. This provides `ToInput` and `FromInput` instances for arbitrary tuples, case classes, etc. as long
diff --git a/README.md b/README.md
index bf5cb60..e46cfa7 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@
 SBT Configuration:
 
 ```scala
-libraryDependencies += "org.sangria-graphql" %% "sangria-circe" % "0.3.0"
+libraryDependencies += "org.sangria-graphql" %% "sangria-circe" % "0.3.1"
 ```
 
 ## License
diff --git a/build.sbt b/build.sbt
index b118441..21aa9b1 100644
--- a/build.sbt
+++ b/build.sbt
@@ -1,6 +1,6 @@
 name := "sangria-circe"
 organization := "org.sangria-graphql"
-version := "0.4.0-SNAPSHOT"
+version := "0.3.1"
 
 description := "Sangria circe marshalling"
 homepage := Some(url("http://sangria-graphql.org"))
@@ -12,12 +12,12 @@ scalacOptions ++= Seq("-deprecation", "-feature")
 val circeVersion = "0.3.0"
 
 libraryDependencies ++= Seq(
-  "org.sangria-graphql" %% "sangria-marshalling-api" % "0.1.0",
+  "org.sangria-graphql" %% "sangria-marshalling-api" % "0.1.1",
 
   "io.circe" %% "circe-core" % circeVersion,
   "io.circe" %% "circe-generic" % circeVersion,
 
-  "org.sangria-graphql" %% "sangria-marshalling-testkit" % "0.1.1" % "test",
+  "org.sangria-graphql" %% "sangria-marshalling-testkit" % "0.1.2" % "test",
   "org.scalatest" %% "scalatest" % "2.2.6" % "test"
 )