diff --git a/ChangeLog b/ChangeLog
index 97f8c23..ba82dae 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,12 @@
+2020-05-03  Xie Yanbo  <xieyanbo@gmail.com>
+
+    * release version 2.0.0
+    * drop python 2 and 3.4 support
+    * upgrade prompt-toolkit to 2.x
+        * prompt-toolkit 3 is not compatible with python3.5
+    * split the huge source file into small pieces
+    * refactory
+
 2020-04-30  Xie Yanbo  <xieyanbo@gmail.com>
 
     * release version 1.3.1
diff --git a/DebugLibrary/version.py b/DebugLibrary/version.py
index d0e714d..204a96f 100644
--- a/DebugLibrary/version.py
+++ b/DebugLibrary/version.py
@@ -1 +1 @@
-VERSION = '1.3.1'
+VERSION = '2.0.0'
diff --git a/README.rst b/README.rst
index ad2e2d8..af4268e 100644
--- a/README.rst
+++ b/README.rst
@@ -24,6 +24,7 @@ which can be used as an interactive shell(REPL) also.
    :target: https://github.com/xyb/robotframework-debuglibrary/blob/master/LICENSE
    :alt: License
 
+
 Installation
 ------------
 
@@ -31,6 +32,13 @@ To install using ``pip``::
 
     pip install robotframework-debuglibrary
 
+NOTICE: 2.0 is not compatible with python 2
+*******************************************
+
+``DebugLibrary`` >= 2.0.0 supports Python versions 3.x only.
+If you still using python 2.7, please use ``DebugLibrary`` < 2.0.0
+
+    pip install 'robotframework-debuglibrary<2'
 
 Usage
 -----