diff --git a/doc/source/conf.py b/doc/source/conf.py
index bdd606ad..b368d0cf 100644
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -56,9 +56,9 @@
 # built documents.
 #
 # The short X.Y version.
-version = '4.2'
+version = '4.3'
 # The full version, including alpha/beta/rc tags.
-release = '4.2'
+release = '4.3'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/setup.py b/setup.py
index b621edf8..c64c0dea 100644
--- a/setup.py
+++ b/setup.py
@@ -8,7 +8,7 @@
 import unittest
 
 MAJOR_VERSION = 4
-MINOR_VERSION = 2
+MINOR_VERSION = 3
 
 def _run_tests():
     directory = os.path.abspath(os.path.dirname(sys.modules['__main__'].__file__))