diff --git a/CHANGES.md b/CHANGES.md
index a037aa9..93a92fc 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -2,6 +2,9 @@ v2.2
 
 * `return_maps` option
 * `uescape` option for 7-bit clean output
+* add `Makefile` for slightly better `erlang.mk` compatibility
+* add `maps_support/0` call to determine whether `jsx` was compiled
+  with support for maps or not
 
 v2.1.1
 
diff --git a/README.md b/README.md
index 54ed046..91cb3e9 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# jsx (v2.1.1) #
+# jsx (v2.2) #
 
 an erlang application for consuming, producing and manipulating [json][json]. 
 inspired by [yajl][yajl]
diff --git a/package.exs b/package.exs
index d7629d6..cf4cf14 100644
--- a/package.exs
+++ b/package.exs
@@ -4,7 +4,7 @@ use Mix.Project
   def project do
     [
       app: :jsx,
-      version: "2.1.1",
+      version: "2.2.0",
       description: "an erlang application for consuming, producing and manipulating json. inspired by yajl",
       package: package
     ]
diff --git a/src/jsx.app.src b/src/jsx.app.src
index 61eb2e4..c7674b1 100644
--- a/src/jsx.app.src
+++ b/src/jsx.app.src
@@ -1,7 +1,7 @@
 {application, jsx,
 [
     {description, "a streaming, evented json parsing toolkit"},
-    {vsn, "2.1.1"},
+    {vsn, "2.2.0"},
     {modules, [
         jsx,
         jsx_encoder,