diff --git a/ornaseq.obo b/ornaseq.obo
index 58197b3..694a67b 100644
--- a/ornaseq.obo
+++ b/ornaseq.obo
@@ -1,4 +1,5 @@
 format-version: 1.2
+data-version: 2019-07-08
 remark: The following ontology is provided by Stephen A Fisher and Junhyong Kim to annotate next-generation sequencing experiments performed on RNA.
 ontology: ornaseq
 property_value: http://purl.org/dc/elements/1.1/contributor "Junhyong Kim" xsd:string
diff --git a/ornaseq.owl b/ornaseq.owl
index 6d97370..4666e46 100644
--- a/ornaseq.owl
+++ b/ornaseq.owl
@@ -9,6 +9,7 @@
      xmlns:xsd="http://www.w3.org/2001/XMLSchema#"
      xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#">
     <owl:Ontology rdf:about="http://purl.obolibrary.org/obo/ornaseq.owl">
+        <owl:versionIRI rdf:resource="http://purl.obolibrary.org/obo/ornaseq/2019-07-08/ornaseq.owl"/>
         <dc:contributor>Junhyong Kim</dc:contributor>
         <dc:contributor>Stephen A Fisher</dc:contributor>
         <dc:license rdf:resource="http://creativecommons.org/licenses/by/4.0/"/>
diff --git a/src/ontology/ornaseq-edit.owl b/src/ontology/ornaseq-edit.owl
index bcbb987..0b0291f 100644
--- a/src/ontology/ornaseq-edit.owl
+++ b/src/ontology/ornaseq-edit.owl
@@ -11,6 +11,7 @@
 
     <owl:Ontology rdf:about="http://purl.obolibrary.org/obo/ornaseq.owl">
         <dc:title xml:lang="en">Ontology for RNA sequencing (ORNASEQ)</dc:title>
+        <owl:versionIRI rdf:resource="http://purl.obolibrary.org/obo/ornaseq/2019-07-08/ornaseq.owl"/>
         <dc:contributor>Stephen A Fisher</dc:contributor>
         <dc:contributor>Junhyong Kim</dc:contributor>
         <dc:license rdf:resource="http://creativecommons.org/licenses/by/4.0/"/>