diff --git a/stix2/__init__.py b/stix2/__init__.py
index 3cd992c..1747c9b 100644
--- a/stix2/__init__.py
+++ b/stix2/__init__.py
@@ -24,7 +24,7 @@
 
 # flake8: noqa
 
-DEFAULT_VERSION = '2.1'  # Default version will always be the latest STIX 2.X version
+from .version import DEFAULT_VERSION
 
 from .confidence import scales
 from .datastore import CompositeDataSource
@@ -61,5 +61,5 @@ from .v21 import *  # This import will always be the latest STIX 2.X version
 from .version import __version__
 from .versioning import new_version, revoke
 
-import stix2.registry
-stix2.registry._collect_stix2_mappings()
+from .registry import _collect_stix2_mappings
+_collect_stix2_mappings()
diff --git a/stix2/version.py b/stix2/version.py
index 9aa3f90..9ddc874 100644
--- a/stix2/version.py
+++ b/stix2/version.py
@@ -1 +1,3 @@
 __version__ = "2.1.0"
+
+DEFAULT_VERSION = '2.1'  # Default version will always be the latest STIX 2.X version