diff --git a/phyx2owl/phyloref/owlterms.py b/phyx2owl/phyloref/owlterms.py
index 9fc527e..28300ab 100644
--- a/phyx2owl/phyloref/owlterms.py
+++ b/phyx2owl/phyloref/owlterms.py
@@ -12,7 +12,7 @@
 OWL_IMPORTS = [
     "https://raw.githubusercontent.com/phyloref/curation-workflow/develop/ontologies/phyloref_testcase.owl",
         # Will become "http://vocab.phyloref.org/phyloref/testcase.owl",
-    "http://ontology.phyloref.org/phyloref.owl",
+    "http://ontology.phyloref.org/2018-12-04/phyloref.owl",
         # Contains OWL definitions for defining Phyloreferences
     "http://purl.obolibrary.org/obo/bco.owl",
         # Contains OWL definitions for Darwin Core terms