diff --git a/stix2/__init__.py b/stix2/__init__.py
index 3bedec8..cc7d780 100644
--- a/stix2/__init__.py
+++ b/stix2/__init__.py
@@ -65,4 +65,4 @@ from .version import __version__
 
 _collect_stix2_mappings()
 
-DEFAULT_VERSION = '2.0'  # Default version will always be the latest STIX 2.X version
+DEFAULT_VERSION = '2.1'  # Default version will always be the latest STIX 2.X version