diff --git a/apps/course/migrations/0021_auto_20180205_1559.py b/apps/course/migrations/0021_auto_20180205_1559.py
deleted file mode 100644
index c4a6a6de..00000000
--- a/apps/course/migrations/0021_auto_20180205_1559.py
+++ /dev/null
@@ -1,35 +0,0 @@
-# Generated by Django 2.0.2 on 2018-02-05 15:59
-
-from django.db import migrations
-from django.contrib.contenttypes.models import ContentType
-
-
-def fwrd_func(apps, schema_editor):
-    CourseComment = apps.get_model('course', 'CourseComment')
-    LessonComment = apps.get_model('course', 'LessonComment')
-    db_alias = schema_editor.connection.alias
-    if CourseComment.objects.exists():
-        coursecomment_content_type = ContentType.objects.get(
-            app_label='course', model='coursecomment',
-        )
-        CourseComment.objects.using(db_alias).all().update(
-            polymorphic_ctype=coursecomment_content_type,
-        )
-    if LessonComment.objects.exists():
-        lessoncomment_content_type = ContentType.objects.get(
-            app_label='course', model='lessoncomment',
-        )
-        LessonComment.objects.using(db_alias).all().update(
-            polymorphic_ctype=lessoncomment_content_type,
-        )
-
-
-class Migration(migrations.Migration):
-
-    dependencies = [
-        ('course', '0020_auto_20180202_1716'),
-    ]
-
-    operations = [
-        migrations.RunPython(fwrd_func)
-    ]
diff --git a/apps/course/migrations/0022_auto_20180205_1615.py b/apps/course/migrations/0022_auto_20180205_1615.py
deleted file mode 100644
index 87bc49b7..00000000
--- a/apps/course/migrations/0022_auto_20180205_1615.py
+++ /dev/null
@@ -1,35 +0,0 @@
-# Generated by Django 2.0.2 on 2018-02-05 16:15
-
-from django.db import migrations
-from django.contrib.contenttypes.models import ContentType
-
-
-def fwrd_func(apps, schema_editor):
-    CourseComment = apps.get_model('course', 'CourseComment')
-    LessonComment = apps.get_model('course', 'LessonComment')
-    db_alias = schema_editor.connection.alias
-    if CourseComment.objects.using(db_alias).all().exists():
-        coursecomment_content_type = ContentType.objects.get(
-            app_label='course', model='coursecomment',
-        )
-        CourseComment.objects.using(db_alias).all().update(
-            polymorphic_ctype=coursecomment_content_type,
-        )
-    if LessonComment.objects.using(db_alias).all().exists():
-        lessoncomment_content_type = ContentType.objects.get(
-            app_label='course', model='lessoncomment',
-        )
-        LessonComment.objects.using(db_alias).all().update(
-            polymorphic_ctype=lessoncomment_content_type,
-        )
-
-
-class Migration(migrations.Migration):
-
-    dependencies = [
-        ('course', '0021_auto_20180205_1559'),
-    ]
-
-    operations = [
-        migrations.RunPython(fwrd_func)
-    ]