diff --git a/CHANGELOG.md b/CHANGELOG.md
index bc07cab..2c012e5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@ Note: Breaking changes between versions are indicated by "💥".
 
 ## Unreleased
 
+- [Bugfix] Fix "LazyStaticAbsoluteUrl is not JSON serializable" error when sending bulk emails.
 - [Bugfix] Fix `tutor local importdemocourse` fails when platform is not up.
 
 ## v13.1.0 (2022-01-08)
diff --git a/tutor/templates/apps/openedx/settings/partials/common_lms.py b/tutor/templates/apps/openedx/settings/partials/common_lms.py
index 577bd41..994cab8 100644
--- a/tutor/templates/apps/openedx/settings/partials/common_lms.py
+++ b/tutor/templates/apps/openedx/settings/partials/common_lms.py
@@ -19,25 +19,7 @@ COURSE_ABOUT_VISIBILITY_PERMISSION = "see_about_page"
 OAUTH_ENFORCE_SECURE = False
 
 # Email settings
-class LazyStaticAbsoluteUrl:
-    """
-    Evaluates a static asset path lazily at runtime
-    """
-    def __init__(self, path):
-        self.path = path
-
-    def __str__(self):
-        from django.conf import settings
-        from django.contrib.staticfiles.storage import staticfiles_storage
-        return settings.LMS_ROOT_URL + staticfiles_storage.url(self.path)
-
-    def to_json(self):
-        # This method is required for json serialization by edx-ace, notably for
-        # serialization of the registration email. See
-        # edx_ace.serialization.MessageEncoder.
-        return str(self)
-# We need a lazily-computed logo url to capture the url of the theme-specific logo.
-DEFAULT_EMAIL_LOGO_URL = LazyStaticAbsoluteUrl("images/logo.png")
+DEFAULT_EMAIL_LOGO_URL = LMS_ROOT_URL + "/theming/asset/images/logo.png"
 
 # Create folders if necessary
 for folder in [DATA_DIR, LOG_DIR, MEDIA_ROOT, STATIC_ROOT_BASE, ORA2_FILEUPLOAD_ROOT]: