diff --git a/doc/conf.py b/doc/conf.py
index 7211da9..15a4f30 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -39,9 +39,9 @@ copyright = '2016, Anthony Tuininga'
 # other places throughout the built documents.
 #
 # The short X.Y version.
-version = '5.2'
+version = '5.3'
 # The full version, including alpha/beta/rc tags.
-release = '5.2.1'
+release = '5.3'
 
 # There are two options for replacing |today|: either, you set today to some
 # non-false value, then it is used:
diff --git a/setup.py b/setup.py
index 5ebaf67..e350066 100644
--- a/setup.py
+++ b/setup.py
@@ -38,7 +38,7 @@ except:
     from distutils.extension import Extension
 
 # define build constants
-BUILD_VERSION = "5.2.1"
+BUILD_VERSION = "5.3"
 
 # define the list of files to be included as documentation for Windows
 dataFiles = None