diff --git a/.bumpversion.cfg b/.bumpversion.cfg
index c259b7b89..dc9167ad6 100644
--- a/.bumpversion.cfg
+++ b/.bumpversion.cfg
@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 3.4.2
+current_version = 4.0.0
 commit = True
 
 [bumpversion:file:ibm_watson/version.py]
diff --git a/ibm_watson/version.py b/ibm_watson/version.py
index daee014fe..d6497a814 100644
--- a/ibm_watson/version.py
+++ b/ibm_watson/version.py
@@ -1 +1 @@
-__version__ = '3.4.2'
+__version__ = '4.0.0'
diff --git a/setup.py b/setup.py
index 30c5c38e8..56d5589c1 100644
--- a/setup.py
+++ b/setup.py
@@ -18,7 +18,7 @@
 import os
 import sys
 
-__version__ = '3.4.2'
+__version__ = '4.0.0'
 
 
 if sys.argv[-1] == 'publish':