diff --git a/app/dao/fact_billing_dao.py b/app/dao/fact_billing_dao.py
index d6fa52519..97c40bf87 100644
--- a/app/dao/fact_billing_dao.py
+++ b/app/dao/fact_billing_dao.py
@@ -455,6 +455,8 @@ def get_rate(
     if notification_type == LETTER_TYPE:
         if letter_page_count == 0:
             return 0
+        # if crown is not set default to true, this is okay because the rates are the same for both crown and non-crown.
+        crown = crown or True
         return next(
             r.rate
             for r in letter_rates if (
diff --git a/requirements.txt b/requirements.txt
index 2a3e7ccc0..27d373238 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -47,14 +47,14 @@ alembic==1.5.8
 amqp==1.4.9
 anyjson==0.3.3
 attrs==20.3.0
-awscli==1.19.35
+awscli==1.19.36
 bcrypt==3.2.0
 billiard==3.3.0.23
 bleach==3.3.0
 blinker==1.4
 boto==2.49.0
-boto3==1.17.35
-botocore==1.20.35
+boto3==1.17.36
+botocore==1.20.36
 certifi==2020.12.5
 chardet==4.0.0
 click==7.1.2
@@ -66,6 +66,7 @@ geojson==2.5.0
 govuk-bank-holidays==0.8
 greenlet==1.0.0
 idna==2.10
+importlib-metadata==3.7.3
 Jinja2==2.11.3
 jmespath==0.10.0
 kombu==3.0.37
@@ -87,13 +88,15 @@ pytz==2021.1
 PyYAML==5.4.1
 redis==3.5.3
 requests==2.25.1
-rsa==4.7.2
+rsa==4.5
 s3transfer==0.3.6
 Shapely==1.7.1
 six==1.15.0
 smartypants==2.0.1
 soupsieve==2.2.1
 statsd==3.3.0
+typing-extensions==3.7.4.3
 urllib3==1.26.4
 webencodings==0.5.1
 Werkzeug==1.0.1
+zipp==3.4.1
diff --git a/tests/app/celery/test_reporting_tasks.py b/tests/app/celery/test_reporting_tasks.py
index 10fe41377..f8f873955 100644
--- a/tests/app/celery/test_reporting_tasks.py
+++ b/tests/app/celery/test_reporting_tasks.py
@@ -379,6 +379,17 @@ def test_get_rate_for_letter_latest(notify_db_session):
     assert rate == Decimal('0.33')
 
 
+def test_get_rate_for_letter_latest_if_crown_is_none(notify_db_session):
+    # letter rates should be passed into the get_rate function as a tuple of start_date, crown, sheet_count,
+    # rate and post_class
+    crown = create_letter_rate(datetime(2017, 12, 1), crown=True, sheet_count=1, rate=0.33, post_class='second')
+    non_crown = create_letter_rate(datetime(2017, 12, 1), crown=False, sheet_count=1, rate=0.35, post_class='second')
+    letter_rates = [crown, non_crown]
+
+    rate = get_rate([], letter_rates, LETTER_TYPE, date(2018, 1, 1), crown=None, letter_page_count=1)
+    assert rate == Decimal('0.33')
+
+
 def test_get_rate_for_sms_and_email(notify_db_session):
     non_letter_rates = [
         create_rate(datetime(2017, 12, 1), 0.15, SMS_TYPE),