diff --git a/dependencies/UCO-unstable b/dependencies/UCO-unstable
index 5cd549e9..1d000627 160000
--- a/dependencies/UCO-unstable
+++ b/dependencies/UCO-unstable
@@ -1 +1 @@
-Subproject commit 5cd549e947e180785031f32b4d825a82146206ca
+Subproject commit 1d00062716c653fd56dc89f06a68f993c5bacb79
diff --git a/ontology/CASE-unstable.ttl b/ontology/CASE-unstable.ttl
index d6517dde..ddeedc86 100644
--- a/ontology/CASE-unstable.ttl
+++ b/ontology/CASE-unstable.ttl
@@ -177,6 +177,7 @@
 	rdfs:label "uco-master"@en ;
 	owl:imports
 		<http://www.w3.org/TR/skos-reference/skos-owl1-dl.rdf> ,
+		<https://ontology.unifiedcyberontology.org/co> ,
 		<https://ontology.unifiedcyberontology.org/uco/action> ,
 		<https://ontology.unifiedcyberontology.org/uco/core> ,
 		<https://ontology.unifiedcyberontology.org/uco/identity> ,