diff --git a/cybox/version.py b/cybox/version.py
index e8ceb28a..85826aeb 100644
--- a/cybox/version.py
+++ b/cybox/version.py
@@ -1,4 +1,4 @@
 # Copyright (c) 2017, The MITRE Corporation. All rights reserved.
 # See LICENSE.txt for complete terms.
 
-__version__ = "2.1.0.19"
+__version__ = "2.1.0.20"
diff --git a/docs/index.rst b/docs/index.rst
index 9228f662..92fcda92 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -15,14 +15,14 @@ version of CybOX.
 ============= ====================
 CybOX Version python-cybox Version
 ============= ====================
-2.1           2.1.0.19 (`PyPI`__) (`GitHub`__)
+2.1           2.1.0.20 (`PyPI`__) (`GitHub`__)
 2.0.1         2.0.1.4 (`PyPI`__) (`GitHub`__)
 2.0           2.0.0.1 (`PyPI`__) (`GitHub`__)
 1.0           1.0.0b3 (`PyPI`__) (`GitHub`__)
 ============= ====================
 
-__ https://pypi.python.org/pypi/cybox/2.1.0.19
-__ https://github.com/CybOXProject/python-cybox/tree/v2.1.0.19
+__ https://pypi.python.org/pypi/cybox/2.1.0.20
+__ https://github.com/CybOXProject/python-cybox/tree/v2.1.0.20
 __ https://pypi.python.org/pypi/cybox/2.0.1.4
 __ https://github.com/CybOXProject/python-cybox/tree/v2.0.1.4
 __ https://pypi.python.org/pypi/cybox/2.0.0.1
diff --git a/setup.cfg b/setup.cfg
index 36812952..55aa876f 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 2.1.0.19
+current_version = 2.1.0.20
 parse = (?P<major>\d+)\.(?P<minor>\d+)\.(?P<patch>\d+).(?P<revision>\d+)(?P<dev_version>.dev\d+)?
 serialize = 
 	{major}.{minor}.{patch}.{revision}.{dev_version}