diff --git a/salt/manager/tools/sbin/soup b/salt/manager/tools/sbin/soup
index 1251f9a57..c3f9f29d4 100755
--- a/salt/manager/tools/sbin/soup
+++ b/salt/manager/tools/sbin/soup
@@ -434,8 +434,8 @@ post_to_2.4.10() {
 }
 
 post_to_2.4.20() {
-  echo "Pruning unused volumes"
-  docker volume prune -f
+  echo "Pruning unused docker volumes on all nodes - This process will run in the background."
+  salt --async \* cmd.run "docker volume prune -f"
   POSTVERSION=2.4.20
 }