diff --git a/definition-files/xcrysden/Singularity.xcrysden-1.6.2 b/definition-files/xcrysden/Singularity.xcrysden-1.6.2
index 05a4824ee523275f6a3a796d024572e430689744..26372a2022b1cb67ced514b7bed7a740cd1eda60 100644
--- a/definition-files/xcrysden/Singularity.xcrysden-1.6.2
+++ b/definition-files/xcrysden/Singularity.xcrysden-1.6.2
@@ -1,5 +1,5 @@
 Bootstrap: shub
-From: mkandes/ubuntu:latest
+From: mkandes/naked-singularity:ubuntu-18.04
 
 %labels
 
@@ -13,7 +13,7 @@ From: mkandes/ubuntu:latest
     AUTHOR_NAME Marty Kandes
     AUTHOR_EMAIL mkandes@sdsc.edu
 
-    LAST_UPDATED 20200413
+    LAST_UPDATED 20201231
 
 %setup