diff --git a/src/soil/variable.py b/src/soil/variable.py
index 3be402e3ada7586f9f5e35f3af9468d5e6066264..1458c4f9fd695de01001fe6cf23dd9880524f4cc 100644
--- a/src/soil/variable.py
+++ b/src/soil/variable.py
@@ -8,7 +8,6 @@ from typing import Any, List, Callable, Union
 import nest_asyncio
 import pytz
 import rdflib
-import strict_rfc3339 as rfc3339
 
 from .datatype import Datatype
 from .semantics import Namespaces