diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 384ee791d..2666702d9 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -17,6 +17,11 @@ Unreleased
 ----------
 * nothing unreleased
 
+[5.3.1]
+-------
+* fix: rely on single constant to define course mode priority order (i.e., ensure all enrollable modes are considered; previously missing honor mode in `enroll_learners_in_courses`).
+* fix: prevent fetching catalog list without a resolved course run in the property `applicable_enterprise_catalog_uuids` within `DefaultEnterpriseEnrollmentIntention`.
+
 [5.3.0]
 --------
 * refactor: Removed unused django setting.
diff --git a/enterprise/__init__.py b/enterprise/__init__.py
index 504cc10c3..f76324143 100644
--- a/enterprise/__init__.py
+++ b/enterprise/__init__.py
@@ -2,4 +2,4 @@
 Your project description goes here.
 """
 
-__version__ = "5.3.0"
+__version__ = "5.3.1"
diff --git a/enterprise/constants.py b/enterprise/constants.py
index 127627303..cc0f8378f 100644
--- a/enterprise/constants.py
+++ b/enterprise/constants.py
@@ -59,14 +59,6 @@ class CourseModes:
     VERIFIED = 'verified'
     UNPAID_EXECUTIVE_EDUCATION = 'unpaid-executive-education'
 
-
-BEST_MODE_ORDER = [
-    CourseModes.VERIFIED,
-    CourseModes.PROFESSIONAL,
-    CourseModes.NO_ID_PROFESSIONAL,
-    CourseModes.UNPAID_EXECUTIVE_EDUCATION,
-]
-
 # Course mode sorting based on slug
 COURSE_MODE_SORT_ORDER = [
     CourseModes.VERIFIED,
diff --git a/enterprise/models.py b/enterprise/models.py
index f76655795..6e559fc63 100644
--- a/enterprise/models.py
+++ b/enterprise/models.py
@@ -2630,6 +2630,10 @@ def applicable_enterprise_catalog_uuids(self):
         """
         Returns a list of UUIDs for applicable enterprise catalogs.
         """
+        if not self.course_run_key:
+            # Without a resolved course run key, prevent the enterprise catalog list from being fetched.
+            return []
+
         contains_content_items_response = get_and_cache_enterprise_contains_content_items(
             enterprise_customer_uuid=self.enterprise_customer.uuid,
             content_keys=[self.course_run_key],
diff --git a/enterprise/utils.py b/enterprise/utils.py
index 07370c950..b04bc43be 100644
--- a/enterprise/utils.py
+++ b/enterprise/utils.py
@@ -37,7 +37,7 @@
 
 from enterprise.constants import (
     ALLOWED_TAGS,
-    BEST_MODE_ORDER,
+    COURSE_MODE_SORT_ORDER,
     DEFAULT_CATALOG_CONTENT_FILTER,
     LMS_API_DATETIME_FORMAT,
     LMS_API_DATETIME_FORMAT_WITHOUT_TIMEZONE,
@@ -2404,7 +2404,7 @@ def get_best_mode_from_course_key(course_key):
     enterprise learner in.
     """
     course_modes = [mode.slug for mode in CourseMode.objects.filter(course_id=course_key)]
-    if best_mode := [mode for mode in BEST_MODE_ORDER if mode in course_modes]:
+    if best_mode := [mode for mode in COURSE_MODE_SORT_ORDER if mode in course_modes]:
         return best_mode[0]
     return CourseModes.AUDIT