diff --git a/docs/release-notes/version-2.9.md b/docs/release-notes/version-2.9.md
index 9187f9ff7..eeab02259 100644
--- a/docs/release-notes/version-2.9.md
+++ b/docs/release-notes/version-2.9.md
@@ -5,6 +5,7 @@
 ### Enhancements
 
 * [#5424](https://github.com/netbox-community/netbox/issues/5424) - Allow passing Python code to `nbshell` using `--command`
+* [#5439](https://github.com/netbox-community/netbox/issues/5439) - Add CS and SN fiber port types
 
 ### Bug Fixes
 
diff --git a/netbox/dcim/choices.py b/netbox/dcim/choices.py
index 639230f70..3b7c7d04e 100644
--- a/netbox/dcim/choices.py
+++ b/netbox/dcim/choices.py
@@ -861,6 +861,8 @@ class PortTypeChoices(ChoiceSet):
     TYPE_LSH = 'lsh'
     TYPE_LSH_APC = 'lsh-apc'
     TYPE_SPLICE = 'splice'
+    TYPE_CS = 'cs'
+    TYPE_SN = 'sn'
 
     CHOICES = (
         (
@@ -888,6 +890,8 @@ class PortTypeChoices(ChoiceSet):
                 (TYPE_SC, 'SC'),
                 (TYPE_SC_APC, 'SC/APC'),
                 (TYPE_ST, 'ST'),
+                (TYPE_CS, 'CS'),
+                (TYPE_SN, 'SN'),
                 (TYPE_SPLICE, 'Splice'),
             )
         )