diff --git a/docs/qemu_winx11.md b/docs/qemu_winx11.md
index 5b525b8..3bf5906 100644
--- a/docs/qemu_winx11.md
+++ b/docs/qemu_winx11.md
@@ -1,6 +1,8 @@
 ## Upgrade buster-backports qemu version
 
 ```
+apt update; apt upgrade -y
+
 apt install libfdt1=\
 $(apt-cache madison libfdt1|head -n1|awk -F'|' '{print $2}'|sed 's/ //g') \
 -y