diff --git a/csst_common/data/csst_params.yml b/csst_common/data/csst_params.yml
index fdc5f285a46118e8b6407ee9b8b08ee8422ce2df..513a4c94d1461987cf1d3af13d0cecc29ba2f97e 100644
--- a/csst_common/data/csst_params.yml
+++ b/csst_common/data/csst_params.yml
@@ -77,9 +77,8 @@ sls: # slit-less spectra
 
 sim: # simulation
   versions:
+    - C6.1
     - C5.2
-    - C5.1
-    - C3
 
 all:
   detectors: