diff --git a/ontology/saref4lift.ttl b/ontology/saref4lift.ttl
index c51be5bffa16309099a4b13d2f392b2ffb2f11b5..1eb311e61a184a2b4ed498da0834fb269f856224 100644
--- a/ontology/saref4lift.ttl
+++ b/ontology/saref4lift.ttl
@@ -15,8 +15,8 @@
 @base <https://saref.etsi.org/saref4lift/> .
 
 <https://saref.etsi.org/saref4lift/> rdf:type owl:Ontology ;
-                                      owl:versionIRI <https://saref.etsi.org/saref4lift/v1.1.1/> ;
-                                      owl:imports <https://saref.etsi.org/core/v3.1.1/>, 
+                                      owl:versionIRI <https://saref.etsi.org/saref4lift/v2.1.1/> ;
+                                      owl:imports <https://saref.etsi.org/core/v3.2.1/>, 
                                         <https://saref.etsi.org/saref4syst/v1.1.2/> ,
                                         <https://saref.etsi.org/saref4bldg/v1.1.2/> ; 
                                       dcterms:creator     <https://www.linkedin.com/in/mahdi-bennara/>,
@@ -26,15 +26,16 @@
                                                           <http://www.maxime-lefrancois.info/> ;
                                       dcterms:description "This ontology extends the SAREF ontology for the Smart Lifts domain."@en ;
                                       dcterms:license <https://forge.etsi.org/etsi-software-license> ;
-                                      dcterms:issued "2021-05-25"^^xsd:date ;
                                       dcterms:modified "2021-03-15"^^xsd:date ;
+                                      dcterms:modified "2024-06-03"^^xsd:date ;
                                       dcterms:publisher <https://www.etsi.org/> ;
                                       dcterms:source <https://saref.etsi.org/sources/saref4lift/> ;
-                                      rdfs:seeAlso <https://www.etsi.org/deliver/etsi_ts/103400_103499/10341011/01.01.01_60/ts_10341011v010101p.pdf> ;
+                                      rdfs:seeAlso <https://www.etsi.org/deliver/etsi_ts/103400_103499/10341011/02.01.01_60/ts_10341011v020101p.pdf> ;
                                       dcterms:title "SAREF extension for Smart Lifts"@en ;
                                       vann:preferredNamespacePrefix "s4lift" ;
                                       vann:preferredNamespaceUri "https://saref.etsi.org/saref4lift/" ;
-                                      owl:versionInfo "v1.1.1" .
+                                      owl:priorVersion <https://saref.etsi.org/saref4lift/v1.1.1/> ;
+                                      owl:versionInfo "v2.1.1" .
 
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 #    Annotation properties