diff --git a/setup.py b/setup.py
index 1da20de..04803fa 100644
--- a/setup.py
+++ b/setup.py
@@ -6,7 +6,7 @@
 
 setup(name='sbol_factory',
       description='Ontology-driven data modeling',
-      version='1.0a13',
+      version='1.0a12',
       install_requires=[
             'sbol3>=1.0b12',  # Note: implicitly includes rdflib
             'sparqlwrapper>=1.8.5',