diff --git a/README.md b/README.md
index 2554b03..9441085 100644
--- a/README.md
+++ b/README.md
@@ -101,6 +101,7 @@ services:
       VPN_PORT_FORWARDING: on
       VPN_PORT_FORWARDING_PROVIDER: "private internet access"
     restart: unless-stopped
+    # for ubuntu-latest, you may need:
     devices:
       - /dev/net/tun:/dev/net/tun
 
@@ -141,7 +142,7 @@ Also, please note that we test against versions, not :latest, as that's like a w
 ```
 services:
   gluetun:
-    image: qmcgaw/gluetun:v3.37.0
+    image: qmcgaw/gluetun:v3.40.0
     volumes:
       - ./data/gluetun:/gluetun
     cap_add:
@@ -157,6 +158,9 @@ services:
       VPN_PORT_FORWARDING: on
       VPN_PORT_FORWARDING_PROVIDER: "protonvpn"
     restart: unless-stopped
+    # for ubuntu-latest, you may need:
+    devices:
+      - /dev/net/tun:/dev/net/tun
 
   transmission: ...same as with piavpn above...
   gluetrans: ....same as with piavpn above...