diff --git a/docs/conf.py b/docs/conf.py
index 9320050..80aa19d 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -21,29 +21,7 @@
 # documentation root, use os.path.abspath to make it absolute, like shown here.
 sys.path.append(os.path.abspath('..'))
 
-
-def relative(filename):
-    here = os.path.dirname('__file__')
-    return os.path.join(here, filename)
-
-
-def read(filename):
-    with io.open(relative(filename), encoding='UTF-8') as f:
-        return f.read()
-
-
-def get_version():
-    r = re.compile('''^__version__ = ["'](.+)["']$''')
-    for line in read('../objgraph.py').splitlines():
-        m = r.match(line)
-        if m:
-            return m.group(1)
-    raise AssertionError('Could not determine version number from objgraph.py')
-
-
-def get_short_version():
-    return '.'.join(get_version().split('.')[:2])
-
+import objgraph
 
 # -- General configuration -----------------------------------------------------
 
@@ -80,9 +58,9 @@ def get_short_version():
 # built documents.
 #
 # The short X.Y version.
-version = get_short_version()
+version = objgraph.__version__
 # The full version, including alpha/beta/rc tags.
-release = get_version()
+release = objgraph.__version__
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.