diff --git a/src/fiber_package/committee/committee.py b/src/fiber_package/committee/committee.py
index 3c250f9..3c9f38a 100644
--- a/src/fiber_package/committee/committee.py
+++ b/src/fiber_package/committee/committee.py
@@ -59,11 +59,11 @@ class CommitteeEditionModel(FiberBaseModel):
     @computed_field
     @property
     def edition_string(self) -> str:
-        start_year = start_date.year
-        if end_date is None:
+        start_year = self.start_date.year
+        if self.end_date is None:
             return f"{start_year} - "
         else:
-            end_year = end_date.year
+            end_year = self.end_date.year
             if end_year == start_year:
                 return f"{start_year}"
             else: