diff --git a/duo.owl b/duo.owl
index bd933d6..10a35aa 100644
--- a/duo.owl
+++ b/duo.owl
@@ -12,7 +12,7 @@
      xmlns:foaf="http://xmlns.com/foaf/0.1/"
      xmlns:dc="http://purl.org/dc/elements/1.1/">
     <owl:Ontology rdf:about="http://purl.obolibrary.org/obo/duo.owl">
-        <owl:versionIRI rdf:resource="http://purl.obolibrary.org/obo/duo/releases/2017-01-26/duo.owl"/>
+        <owl:versionIRI rdf:resource="http://purl.obolibrary.org/obo/duo/releases/2017-01-31/duo.owl"/>
         <owl:imports rdf:resource="http://purl.obolibrary.org/obo/iao/2015-02-23/iao.owl"/>
         <dc:contributor rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Stephanie Dyke</dc:contributor>
         <dc:contributor rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Giselle Kerry</dc:contributor>