diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2adc4391..54dff7fe 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,8 +1,8 @@
 ArduinoJson: change log
 =======================
 
-HEAD
-----
+v5.5.0
+------
 
 * Added `JsonVariant::success()` (issue #279)
 * Renamed `JsonVariant::invalid<T>()` to `JsonVariant::defaultValue<T>()`
diff --git a/appveyor.yml b/appveyor.yml
index faa35c6c..7e1d5efb 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,4 +1,4 @@
-version: 5.4.0.{build}
+version: 5.5.0.{build}
 environment:
   matrix:
   - CMAKE_GENERATOR: Visual Studio 14 2015
diff --git a/library.json b/library.json
index c5173b47..f9c4b576 100644
--- a/library.json
+++ b/library.json
@@ -6,7 +6,7 @@
     "type": "git",
     "url": "https://github.com/bblanchon/ArduinoJson.git"
   },
-  "version": "5.4.0",
+  "version": "5.5.0",
   "authors": {
     "name": "Benoit Blanchon",
     "url": "http://blog.benoitblanchon.fr"
diff --git a/library.properties b/library.properties
index 705971e9..ef1504fd 100644
--- a/library.properties
+++ b/library.properties
@@ -1,5 +1,5 @@
 name=ArduinoJson
-version=5.4.0
+version=5.5.0
 author=Benoit Blanchon <blog.benoitblanchon.fr>
 maintainer=Benoit Blanchon <blog.benoitblanchon.fr>
 sentence=An efficient and elegant JSON library for Arduino.