diff --git a/pom.xml b/pom.xml
index 9c8b923ac..5c26f8517 100644
--- a/pom.xml
+++ b/pom.xml
@@ -40,6 +40,8 @@
         <minor.version>1</minor.version>
         <build.version>0</build.version>
 
+        <ontology.version>4.1.0</ontology.version>
+
         <java.version>17</java.version>
         <jena.version>4.2.0</jena.version>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
diff --git a/src/main/resources/iguana.owx b/src/main/resources/iguana.owx
index 9574ead04..9624ab0d8 100644
--- a/src/main/resources/iguana.owx
+++ b/src/main/resources/iguana.owx
@@ -6,7 +6,7 @@
      xmlns:xsd="http://www.w3.org/2001/XMLSchema#"
      xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
      ontologyIRI="https://iguana-benchmark.eu/ontology/"
-     versionIRI="https://iguana-benchmark.eu/ontology/${revision}/">
+     versionIRI="https://iguana-benchmark.eu/ontology/${ontology.version}/">
     <Prefix name="dc" IRI="http://purl.org/dc/elements/1.1/"/>
     <Prefix name="owl" IRI="http://www.w3.org/2002/07/owl#"/>
     <Prefix name="rdf" IRI="http://www.w3.org/1999/02/22-rdf-syntax-ns#"/>