diff --git a/completion_aggregator/models.py b/completion_aggregator/models.py
index 3f848c3d..62c1d0fd 100644
--- a/completion_aggregator/models.py
+++ b/completion_aggregator/models.py
@@ -201,6 +201,7 @@ def emit_completion_aggregator_logs(updated_aggregators):
                 event_name,
                 {
                     "user_id": aggregator.user_id,
+                    "username": aggregator.user.username,
                     "course_id": str(aggregator.course_key),
                     "block_id": str(aggregator.block_key),
                     "modified": aggregator.modified,
diff --git a/tests/fixtures/raw/openedx.completion_aggregator.progress.chapter.json b/tests/fixtures/raw/openedx.completion_aggregator.progress.chapter.json
index 007e09a7..3bd42191 100644
--- a/tests/fixtures/raw/openedx.completion_aggregator.progress.chapter.json
+++ b/tests/fixtures/raw/openedx.completion_aggregator.progress.chapter.json
@@ -3,6 +3,7 @@
   "timestamp": "2023-12-05T21:34:52.909063+00:00",
   "data": {
     "user_id": 4,
+    "username": "openedx",
     "course_id": "course-v1:edX+DemoX+Demo_Course",
     "context_key": "course-v1:edX+DemoX+Demo_Course",
     "block_id": "block-v1:edX+DemoX+Demo_Course+type@chapter+block@b443e0d6bc4d43c1bed991dbd8a10d42",
@@ -15,7 +16,7 @@
     "course_id": "course-v1:edX+DemoX+Demo_Course",
     "course_user_tags": {},
     "session": "056aca2a1c6b76742b283e73d3424453",
-    "user_id": 3,
+    "user_id": 4,
     "username": "openedx",
     "ip": "172.18.0.1",
     "host": "localhost:18000",
diff --git a/tests/fixtures/raw/openedx.completion_aggregator.progress.course.json b/tests/fixtures/raw/openedx.completion_aggregator.progress.course.json
index dbd5ece4..3e50bc5a 100644
--- a/tests/fixtures/raw/openedx.completion_aggregator.progress.course.json
+++ b/tests/fixtures/raw/openedx.completion_aggregator.progress.course.json
@@ -3,6 +3,7 @@
   "timestamp": "2023-12-05T21:34:52.909063+00:00",
   "data": {
     "user_id": 4,
+    "username": "openedx",
     "course_id": "course-v1:edX+DemoX+Demo_Course",
     "context_key": "course-v1:edX+DemoX+Demo_Course",
     "block_id": "block-v1:edX+DemoX+Demo_Course+type@course+block@course",
@@ -15,7 +16,7 @@
     "course_id": "course-v1:edX+DemoX+Demo_Course",
     "course_user_tags": {},
     "session": "056aca2a1c6b76742b283e73d3424453",
-    "user_id": 3,
+    "user_id": 4,
     "username": "openedx",
     "ip": "172.18.0.1",
     "host": "localhost:18000",
diff --git a/tests/fixtures/raw/openedx.completion_aggregator.progress.sequential.json b/tests/fixtures/raw/openedx.completion_aggregator.progress.sequential.json
index 949f44aa..e1726192 100644
--- a/tests/fixtures/raw/openedx.completion_aggregator.progress.sequential.json
+++ b/tests/fixtures/raw/openedx.completion_aggregator.progress.sequential.json
@@ -3,6 +3,7 @@
   "timestamp": "2023-12-05T21:34:52.909063+00:00",
   "data": {
     "user_id": 4,
+    "username": "openedx",
     "course_id": "course-v1:edX+DemoX+Demo_Course",
     "context_key": "course-v1:edX+DemoX+Demo_Course",
     "block_id": "block-v1:edX+DemoX+Demo_Course+type@sequential+block@bf1eac10ebb649e3aaf9cc07325f8e04",
@@ -15,7 +16,7 @@
     "course_id": "course-v1:edX+DemoX+Demo_Course",
     "course_user_tags": {},
     "session": "056aca2a1c6b76742b283e73d3424453",
-    "user_id": 3,
+    "user_id": 4,
     "username": "openedx",
     "ip": "172.18.0.1",
     "host": "localhost:18000",
diff --git a/tests/fixtures/raw/openedx.completion_aggregator.progress.vertical.json b/tests/fixtures/raw/openedx.completion_aggregator.progress.vertical.json
index 3d8d8a49..9618c1c0 100644
--- a/tests/fixtures/raw/openedx.completion_aggregator.progress.vertical.json
+++ b/tests/fixtures/raw/openedx.completion_aggregator.progress.vertical.json
@@ -3,6 +3,7 @@
   "timestamp": "2023-12-05T21:34:52.909063+00:00",
   "data": {
     "user_id": 4,
+    "username": "openedx",
     "course_id": "course-v1:edX+DemoX+Demo_Course",
     "context_key": "course-v1:edX+DemoX+Demo_Course",
     "block_id": "block-v1:edX+DemoX+Demo_Course+type@vertical+block@e1fabd9fa55f441caa75580f258ffbc3",
@@ -15,7 +16,7 @@
     "course_id": "course-v1:edX+DemoX+Demo_Course",
     "course_user_tags": {},
     "session": "056aca2a1c6b76742b283e73d3424453",
-    "user_id": 3,
+    "user_id": 4,
     "username": "openedx",
     "ip": "172.18.0.1",
     "host": "localhost:18000",
diff --git a/tests/test_models.py b/tests/test_models.py
index 2a7dddba..8c6d583d 100644
--- a/tests/test_models.py
+++ b/tests/test_models.py
@@ -249,6 +249,7 @@ def assert_emit_method_called(self, obj):
             f"openedx.completion_aggregator.progress.{obj.aggregation_name}",
             {
                 "user_id": obj.user_id,
+                "username": obj.user.username,
                 "course_id": str(obj.course_key),
                 "block_id": str(obj.block_key),
                 "modified": obj.modified,