diff --git a/appveyor.yml b/appveyor.yml
index f5d79b18..b6b178c9 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,4 +1,4 @@
-version: 5.13.1.{build}
+version: 6.0.0.{build}
 environment:
   matrix:
   - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
diff --git a/library.json b/library.json
index eb790b92..4951ee33 100644
--- a/library.json
+++ b/library.json
@@ -7,7 +7,7 @@
     "type": "git",
     "url": "https://github.com/bblanchon/ArduinoJson.git"
   },
-  "version": "5.13.1",
+  "version": "6.0.0",
   "authors": {
     "name": "Benoit Blanchon",
     "url": "https://blog.benoitblanchon.fr"
diff --git a/library.properties b/library.properties
index 97e2f03a..b1e2aaac 100644
--- a/library.properties
+++ b/library.properties
@@ -1,5 +1,5 @@
 name=ArduinoJson
-version=5.13.1
+version=6.0.0
 author=Benoit Blanchon <blog.benoitblanchon.fr>
 maintainer=Benoit Blanchon <blog.benoitblanchon.fr>
 sentence=An efficient and elegant JSON library for Arduino.