diff --git a/src/rospkg/os_detect.py b/src/rospkg/os_detect.py
index 08faf5a..15dd444 100644
--- a/src/rospkg/os_detect.py
+++ b/src/rospkg/os_detect.py
@@ -178,6 +178,7 @@ def get_codename(self):
                 '12': 'bookworm',
                 '13': 'trixie',
                 '14': 'forky',
+                '15': 'duke',
                 'unstable': 'sid',
                 'rodete': 'trixie',
             }.get(v, '')