diff --git a/csst_common/params.py b/csst_common/params.py
index 86fbd9ce0985989d1f7fb31e91c4bd4bc146aa00..66d158307d13087a5881ba87ea91860d9d1720a2 100644
--- a/csst_common/params.py
+++ b/csst_common/params.py
@@ -90,7 +90,7 @@ class CsstSimParams(BasicParams):
     def __init__(self):
         # define versions of simulation
         # C denotes for Cycle
-        self.VER_SIMS = ["C3", "C5.1", "C5.2"]
+        self.VERSIONS = ["C3", "C5.1", "C5.2"]
 
 
 cp = CsstParams()