diff --git a/_constraints b/_constraints
index 6d78c6e..2274919 100644
--- a/_constraints
+++ b/_constraints
@@ -1,9 +1,9 @@
 <?xml version="1.0"?>
 <constraints>
   <hardware>
-    <physicalmemory>
-      <size unit="G">16</size>
-    </physicalmemory>
+    <memory>
+      <size unit="G">21</size>
+    </memory>
   </hardware>
   <overwrite>
     <conditions>