diff --git a/compose.smtp.yml b/compose.smtp.yml
index 91844ca..4ee349b 100644
--- a/compose.smtp.yml
+++ b/compose.smtp.yml
@@ -1,3 +1,5 @@
+version: "3.8"
+
 services:
   app:
     secrets:
diff --git a/compose.yml b/compose.yml
index 376e364..dd9087b 100644
--- a/compose.yml
+++ b/compose.yml
@@ -1,3 +1,5 @@
+version: "3.8"
+
 services:
   wireguard:
     image: linuxserver/wireguard:latest