diff --git a/heat/engine/resources/openstack/neutron/firewall.py b/heat/engine/resources/openstack/neutron/firewall.py
index 740cb16bfe..fce59da817 100644
--- a/heat/engine/resources/openstack/neutron/firewall.py
+++ b/heat/engine/resources/openstack/neutron/firewall.py
@@ -243,8 +243,8 @@ class FirewallPolicy(neutron.NeutronResource):
         ),
         FIREWALL_RULES: properties.Schema(
             properties.Schema.LIST,
-            _('An ordered list of firewall rules to apply to the firewall.'),
-            required=True,
+            _('An ordered list of firewall rules to apply to the firewall. '
+              '(Prior to version 14.0.0 this was a required property).'),
             update_allowed=True
         ),
     }
diff --git a/releasenotes/notes/update-firwallpolicy-ruls-90a8904e899b2365.yaml b/releasenotes/notes/update-firwallpolicy-ruls-90a8904e899b2365.yaml
new file mode 100644
index 0000000000..69049c9230
--- /dev/null
+++ b/releasenotes/notes/update-firwallpolicy-ruls-90a8904e899b2365.yaml
@@ -0,0 +1,5 @@
+---
+fixes:
+- |
+  The `firewall_rules` property of the `OS::Neutron::FirewallPolicy`
+  resource type is now optional.
\ No newline at end of file