diff --git a/CHANGELOG.md b/CHANGELOG.md
index dafe9f3..9009e56 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,12 @@ All notable changes to rattail-mailchimp will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
+## v0.3.3 (2024-07-05)
+
+### Fix
+
+- define `host_key` for MailChimp -> Rattail import
+
 ## v0.3.2 (2024-07-01)
 
 ### Fix
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..5b17139
--- /dev/null
+++ b/README.md
@@ -0,0 +1,11 @@
+
+# rattail_mailchimp
+
+Rattail is a retail software framework, released under the GNU General
+Public License.
+
+This package contains software interfaces for the
+[MailChimp](https://mailchimp.com/) system.
+
+Please see the [Rattail Project](https://rattailproject.org/) for more
+information.
diff --git a/README.rst b/README.rst
deleted file mode 100644
index 25dc9c3..0000000
--- a/README.rst
+++ /dev/null
@@ -1,14 +0,0 @@
-
-rattail_mailchimp
-=================
-
-Rattail is a retail software framework, released under the GNU General
-Public License.
-
-This package contains software interfaces for the `MailChimp`_ system.
-
-.. _`MailChimp`: https://mailchimp.com/
-
-Please see the `Rattail Project`_ for more information.
-
-.. _`Rattail Project`: https://rattailproject.org/
diff --git a/pyproject.toml b/pyproject.toml
index 1c88935..335d26c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -6,9 +6,9 @@ build-backend = "hatchling.build"
 
 [project]
 name = "rattail-mailchimp"
-version = "0.3.2"
+version = "0.3.3"
 description = "Rattail Software Interfaces for MailChimp"
-readme = "README.rst"
+readme = "README.md"
 authors = [{name = "Lance Edgar", email = "lance@edbob.org"}]
 license = {text = "GNU GPL v3+"}
 classifiers = [
diff --git a/rattail_mailchimp/config.py b/rattail_mailchimp/config.py
index 9005b78..4bad837 100644
--- a/rattail_mailchimp/config.py
+++ b/rattail_mailchimp/config.py
@@ -24,10 +24,10 @@
 Config extensions for rattail-mailchimp
 """
 
-from rattail.config import ConfigExtension
+from wuttjamaican.conf import WuttaConfigExtension
 
 
-class MailchimpConfigExtension(ConfigExtension):
+class MailchimpConfigExtension(WuttaConfigExtension):
     """
     Config extension for rattail-mailchimp
     """
diff --git a/rattail_mailchimp/importing/mailchimp.py b/rattail_mailchimp/importing/mailchimp.py
index 6c194fb..c5f9a35 100644
--- a/rattail_mailchimp/importing/mailchimp.py
+++ b/rattail_mailchimp/importing/mailchimp.py
@@ -2,7 +2,7 @@
 ################################################################################
 #
 #  Rattail -- Retail Software Framework
-#  Copyright © 2010-2023 Lance Edgar
+#  Copyright © 2010-2024 Lance Edgar
 #
 #  This file is part of Rattail.
 #
@@ -30,7 +30,6 @@ from collections import OrderedDict
 from mailchimp3 import MailChimp
 
 from rattail import importing
-from rattail.time import localtime, make_utc
 from rattail_mailchimp import importing as mailchimp_importing
 
 
@@ -38,7 +37,9 @@ class FromMailChimpToRattail(importing.ToRattailHandler):
     """
     Handler for MailChimp -> Rattail cache import
     """
+    host_key = 'mailchimp'
     host_title = "MailChimp"
+    generic_host_title = "MailChimp"
     
     def get_importers(self):
         importers = OrderedDict()
@@ -53,7 +54,7 @@ class FromMailChimp(importing.Importer):
     """
 
     def setup(self):
-        super(FromMailChimp, self).setup()
+        super().setup()
 
         self.api_key = self.config.require('mailchimp', 'api_key')
         self.mailchimp = MailChimp(self.api_key)
@@ -65,10 +66,10 @@ class FromMailChimp(importing.Importer):
             # issue..since we clearly have a UTC value
             value = value[:-6]
             dt = datetime.datetime.strptime(value, '%Y-%m-%dT%H:%M:%S')
-            dt = localtime(self.config, dt, from_utc=True)
+            dt = self.app.localtime(dt, from_utc=True)
         else:
             dt = datetime.datetime.strptime(value, '%Y-%m-%dT%H:%M:%S%z')
-            dt = localtime(self.config, dt)
+            dt = self.app.localtime(dt)
         return dt
 
 
@@ -95,7 +96,7 @@ class MailChimpListImporter(FromMailChimp, mailchimp_importing.model.MailChimpLi
         return {
             'id': mclist['id'],
             'name': mclist['name'],
-            'date_created': make_utc(date_created),
+            'date_created': self.app.make_utc(date_created),
         }
 
 
@@ -160,6 +161,6 @@ class MailChimpListMemberImporter(FromMailChimp, mailchimp_importing.model.MailC
             'status': member['status'],
             # TODO: this API endpoint does not appear to include this field?
             # 'unsubscribe_reason': member.get('unsubscribe_reason'),
-            'last_changed': make_utc(last_changed),
+            'last_changed': self.app.make_utc(last_changed),
             'source': member['source'],
         }