diff --git a/analytics/migrations/0001_initial.py b/analytics/migrations/0001_initial.py
index 0e037375e3..c30b4754d9 100644
--- a/analytics/migrations/0001_initial.py
+++ b/analytics/migrations/0001_initial.py
@@ -1,6 +1,4 @@
 # -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django.db import models, migrations
 import django.db.models.deletion
 from django.conf import settings
diff --git a/analytics/migrations/0002_remove_huddlecount.py b/analytics/migrations/0002_remove_huddlecount.py
index fa141b0e6f..c38d9ee44e 100644
--- a/analytics/migrations/0002_remove_huddlecount.py
+++ b/analytics/migrations/0002_remove_huddlecount.py
@@ -1,6 +1,4 @@
 # -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django.db import migrations, models
 
 
diff --git a/analytics/migrations/0003_fillstate.py b/analytics/migrations/0003_fillstate.py
index 336f3c8090..5e75edfd9a 100644
--- a/analytics/migrations/0003_fillstate.py
+++ b/analytics/migrations/0003_fillstate.py
@@ -1,6 +1,4 @@
 # -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django.db import migrations, models
 import zerver.lib.str_utils
 
diff --git a/analytics/migrations/0004_add_subgroup.py b/analytics/migrations/0004_add_subgroup.py
index ce2f8531b0..e16e7733f0 100644
--- a/analytics/migrations/0004_add_subgroup.py
+++ b/analytics/migrations/0004_add_subgroup.py
@@ -1,6 +1,4 @@
 # -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django.db import migrations, models
 
 
diff --git a/analytics/migrations/0005_alter_field_size.py b/analytics/migrations/0005_alter_field_size.py
index 705862fdec..eed94b35db 100644
--- a/analytics/migrations/0005_alter_field_size.py
+++ b/analytics/migrations/0005_alter_field_size.py
@@ -1,6 +1,4 @@
 # -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django.db import migrations, models
 
 
diff --git a/analytics/migrations/0006_add_subgroup_to_unique_constraints.py b/analytics/migrations/0006_add_subgroup_to_unique_constraints.py
index 9898390ebb..ecb22060c8 100644
--- a/analytics/migrations/0006_add_subgroup_to_unique_constraints.py
+++ b/analytics/migrations/0006_add_subgroup_to_unique_constraints.py
@@ -1,6 +1,4 @@
 # -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django.db import migrations, models
 
 
diff --git a/analytics/migrations/0007_remove_interval.py b/analytics/migrations/0007_remove_interval.py
index dc5a687be0..0b9562c9bb 100644
--- a/analytics/migrations/0007_remove_interval.py
+++ b/analytics/migrations/0007_remove_interval.py
@@ -1,7 +1,5 @@
 # -*- coding: utf-8 -*-
 # Generated by Django 1.10.4 on 2017-01-16 20:50
-from __future__ import unicode_literals
-
 from django.conf import settings
 from django.db import migrations
 
diff --git a/analytics/migrations/0008_add_count_indexes.py b/analytics/migrations/0008_add_count_indexes.py
index f28fdce1b8..7d95671840 100644
--- a/analytics/migrations/0008_add_count_indexes.py
+++ b/analytics/migrations/0008_add_count_indexes.py
@@ -1,7 +1,5 @@
 # -*- coding: utf-8 -*-
 # Generated by Django 1.10.5 on 2017-02-01 22:28
-from __future__ import unicode_literals
-
 from django.db import migrations
 
 
diff --git a/confirmation/migrations/0001_initial.py b/confirmation/migrations/0001_initial.py
index 3298e64440..ca6d1951b4 100644
--- a/confirmation/migrations/0001_initial.py
+++ b/confirmation/migrations/0001_initial.py
@@ -1,6 +1,4 @@
 # -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django.db import models, migrations
 import django.db.models.deletion
 
diff --git a/confirmation/migrations/0002_realmcreationkey.py b/confirmation/migrations/0002_realmcreationkey.py
index fdebfdbb30..75d3b9d244 100644
--- a/confirmation/migrations/0002_realmcreationkey.py
+++ b/confirmation/migrations/0002_realmcreationkey.py
@@ -1,6 +1,4 @@
 # -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django.db import models, migrations
 import django.utils.timezone
 
diff --git a/confirmation/migrations/0003_emailchangeconfirmation.py b/confirmation/migrations/0003_emailchangeconfirmation.py
index cd7c126ab9..c64b3d6f67 100644
--- a/confirmation/migrations/0003_emailchangeconfirmation.py
+++ b/confirmation/migrations/0003_emailchangeconfirmation.py
@@ -1,7 +1,5 @@
 # -*- coding: utf-8 -*-
 # Generated by Django 1.10.4 on 2017-01-17 09:16
-from __future__ import unicode_literals
-
 from django.db import migrations
 
 
diff --git a/confirmation/migrations/0004_remove_confirmationmanager.py b/confirmation/migrations/0004_remove_confirmationmanager.py
index 62ed622ed2..06469ff52b 100644
--- a/confirmation/migrations/0004_remove_confirmationmanager.py
+++ b/confirmation/migrations/0004_remove_confirmationmanager.py
@@ -1,7 +1,5 @@
 # -*- coding: utf-8 -*-
 # Generated by Django 1.11.2 on 2017-07-08 04:23
-from __future__ import unicode_literals
-
 from django.db import migrations, models
 
 
diff --git a/pgroonga/migrations/0001_enable.py b/pgroonga/migrations/0001_enable.py
index cc008bec87..282db08732 100644
--- a/pgroonga/migrations/0001_enable.py
+++ b/pgroonga/migrations/0001_enable.py
@@ -1,6 +1,4 @@
 # -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django.db import models, migrations
 from django.contrib.postgres import operations
 from django.conf import settings
diff --git a/zerver/migrations/0110_stream_is_in_zephyr_realm.py b/zerver/migrations/0110_stream_is_in_zephyr_realm.py
index 254344f0c2..6bee548101 100644
--- a/zerver/migrations/0110_stream_is_in_zephyr_realm.py
+++ b/zerver/migrations/0110_stream_is_in_zephyr_realm.py
@@ -1,7 +1,5 @@
 # -*- coding: utf-8 -*-
 # Generated by Django 1.11.5 on 2017-10-08 18:37
-from __future__ import unicode_literals
-
 from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 from django.db import connection, migrations, models
diff --git a/zilencer/migrations/0001_initial.py b/zilencer/migrations/0001_initial.py
index a42b00cb26..d1b8229433 100644
--- a/zilencer/migrations/0001_initial.py
+++ b/zilencer/migrations/0001_initial.py
@@ -1,6 +1,4 @@
 # -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django.db import models, migrations
 
 
diff --git a/zilencer/migrations/0002_remote_zulip_server.py b/zilencer/migrations/0002_remote_zulip_server.py
index bff7e10a63..3302182512 100644
--- a/zilencer/migrations/0002_remote_zulip_server.py
+++ b/zilencer/migrations/0002_remote_zulip_server.py
@@ -1,6 +1,4 @@
 # -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django.db import migrations, models
 import django.db.models.deletion
 
diff --git a/zilencer/migrations/0003_add_default_for_remotezulipserver_last_updated_field.py b/zilencer/migrations/0003_add_default_for_remotezulipserver_last_updated_field.py
index 216cd20927..8d96d6bab8 100644
--- a/zilencer/migrations/0003_add_default_for_remotezulipserver_last_updated_field.py
+++ b/zilencer/migrations/0003_add_default_for_remotezulipserver_last_updated_field.py
@@ -1,7 +1,5 @@
 # -*- coding: utf-8 -*-
 # Generated by Django 1.10.5 on 2017-05-16 00:03
-from __future__ import unicode_literals
-
 from django.db import migrations, models
 
 
diff --git a/zilencer/migrations/0004_remove_deployment_model.py b/zilencer/migrations/0004_remove_deployment_model.py
index eb40d378bf..90c5bccf89 100644
--- a/zilencer/migrations/0004_remove_deployment_model.py
+++ b/zilencer/migrations/0004_remove_deployment_model.py
@@ -1,7 +1,5 @@
 # -*- coding: utf-8 -*-
 # Generated by Django 1.11.5 on 2017-10-12 06:27
-from __future__ import unicode_literals
-
 from django.db import migrations