python: version 4.0.0
diff --git a/bindings/python/setup.py b/bindings/python/setup.py
index b936c70..cc803bb 100755
--- a/bindings/python/setup.py
+++ b/bindings/python/setup.py
@@ -14,7 +14,7 @@
 from setuptools.command.bdist_egg import bdist_egg
 
 SYSTEM = sys.platform
-VERSION = '4.0'
+VERSION = '4.0.0'
 
 # adapted from commit e504b81 of Nguyen Tan Cong
 # Reference: https://docs.python.org/2/library/platform.html#cross-platform
diff --git a/bindings/python/setup_cython.py b/bindings/python/setup_cython.py
index f2b73db..857976e 100644
--- a/bindings/python/setup_cython.py
+++ b/bindings/python/setup_cython.py
@@ -8,8 +8,8 @@
 from distutils.command.build import build
 from Cython.Distutils import build_ext
 
-VERSION = '4.0'
 SYSTEM = sys.platform
+VERSION = '4.0.0'
 
 # adapted from commit e504b81 of Nguyen Tan Cong
 # Reference: https://docs.python.org/2/library/platform.html#cross-platform