diff --git a/common.nix b/common.nix
index a068566..203d009 100644
--- a/common.nix
+++ b/common.nix
@@ -31,7 +31,7 @@
 
       extraOptions = ''
         builders-use-substitutes = true
-        experimental-features = nix-command flakes
+        experimental-features = nix-command flakes ca-references
         keep-outputs = true
         keep-derivations = true
       '';