diff --git a/setup.py b/setup.py
index 6aa3e94..bf08290 100644
--- a/setup.py
+++ b/setup.py
@@ -161,6 +161,15 @@ setup(
             'theo = theo.config:TheoConfig',
         ],
 
+        'rattail.importing': [
+            # nb. we always register all 3 handlers here, for version
+            # imports.  any which fail to load will simply not appear
+            # available to the user.
+            'to_rattail_versions.from_rattail.import.theo_catapult = theo.importing.versions_catapult:FromTheoToTheoVersions',
+            'to_rattail_versions.from_rattail.import.theo_corepos = theo.importing.versions_corepos:FromTheoToTheoVersions',
+            'to_rattail_versions.from_rattail.import.theo_locsms = theo.importing.versions_locsms:FromTheoToTheoVersions',
+        ],
+
         'paste.app_factory': [
             'main = theo.web.app:main',
             'webapi = theo.web.webapi:main',