diff --git a/CHANGELOG.md b/CHANGELOG.md
index bfad69c3..7eb642c7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,11 @@
 # Changelog
 All notable changes to this project will be documented in this file.
 
+## v1.17.0-dev - Unreleased
+
+## Improvements
+- Django 3.1
+
 ## v1.16.0 - 2020-08-04
 
 ### Improvements
diff --git a/hc/api/migrations/0075_auto_20200805_1004.py b/hc/api/migrations/0075_auto_20200805_1004.py
new file mode 100644
index 00000000..18889b17
--- /dev/null
+++ b/hc/api/migrations/0075_auto_20200805_1004.py
@@ -0,0 +1,23 @@
+# Generated by Django 3.1 on 2020-08-05 10:04
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('api', '0074_auto_20200803_1411'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='check',
+            name='last_ping_was_fail',
+            field=models.BooleanField(default=False),
+        ),
+        migrations.AlterField(
+            model_name='check',
+            name='manual_resume',
+            field=models.BooleanField(default=False),
+        ),
+    ]
diff --git a/hc/api/models.py b/hc/api/models.py
index 83a9a83f..01a98882 100644
--- a/hc/api/models.py
+++ b/hc/api/models.py
@@ -78,13 +78,13 @@ class Check(models.Model):
     subject = models.CharField(max_length=100, blank=True)
     subject_fail = models.CharField(max_length=100, blank=True)
     methods = models.CharField(max_length=30, blank=True)
-    manual_resume = models.NullBooleanField(default=False)
+    manual_resume = models.BooleanField(default=False)
 
     n_pings = models.IntegerField(default=0)
     last_ping = models.DateTimeField(null=True, blank=True)
     last_start = models.DateTimeField(null=True, blank=True)
     last_duration = models.DurationField(null=True, blank=True)
-    last_ping_was_fail = models.NullBooleanField(default=False)
+    last_ping_was_fail = models.BooleanField(default=False)
     has_confirmation_link = models.BooleanField(default=False)
     alert_after = models.DateTimeField(null=True, blank=True, editable=False)
     status = models.CharField(max_length=6, choices=STATUSES, default="new")
diff --git a/requirements.txt b/requirements.txt
index 15519b22..1c659329 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 cron-descriptor==1.2.24
 croniter==0.3.31
-Django==3.0.8
+Django==3.1
 django-compressor==2.4
 psycopg2==2.8.4
 pytz==2020.1