diff --git a/source/conf.py b/source/conf.py
index 36301f7..effb280 100644
--- a/source/conf.py
+++ b/source/conf.py
@@ -12,8 +12,8 @@
 # add these directories to sys.path here. If the directory is relative to the
 # documentation root, use os.path.abspath to make it absolute, like shown here.
 #
-# import os
-# import sys
+import os
+import sys
 # sys.path.insert(0, os.path.abspath('.'))
 
 
@@ -24,9 +24,9 @@
 author = 'George K. Thiruvathukal'
 
 # The short X.Y version
-version = ''
+version = os.environ.get("BOOK_VERSION", "beta")
 # The full version, including alpha/beta/rc tags
-release = '0.1'
+release = version
 
 
 # -- General configuration ---------------------------------------------------