diff --git a/docker-compose.yml b/docker-compose.yml
index 3efd6a42b8..f08dc87bd2 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -1,4 +1,3 @@
-version: '2.1'
 services:
 
     unbound-mailcow:
diff --git a/helper-scripts/docker-compose.override.yml.d/BUILD_FLAGS/docker-compose.override.yml b/helper-scripts/docker-compose.override.yml.d/BUILD_FLAGS/docker-compose.override.yml
index 8dde63b1b9..d2dd0f6065 100644
--- a/helper-scripts/docker-compose.override.yml.d/BUILD_FLAGS/docker-compose.override.yml
+++ b/helper-scripts/docker-compose.override.yml.d/BUILD_FLAGS/docker-compose.override.yml
@@ -1,4 +1,3 @@
-version: '2.1'
 services:
   unbound-mailcow:
     build: ./data/Dockerfiles/unbound
diff --git a/helper-scripts/docker-compose.override.yml.d/EXTERNAL_DNS/docker-compose.override.yml b/helper-scripts/docker-compose.override.yml.d/EXTERNAL_DNS/docker-compose.override.yml
index 74763bf236..a3566540b6 100644
--- a/helper-scripts/docker-compose.override.yml.d/EXTERNAL_DNS/docker-compose.override.yml
+++ b/helper-scripts/docker-compose.override.yml.d/EXTERNAL_DNS/docker-compose.override.yml
@@ -1,4 +1,3 @@
-version: '2.1'
 services:
 
     clamd-mailcow:
diff --git a/helper-scripts/docker-compose.override.yml.d/EXTERNAL_MYSQL_SOCKET/docker-compose.override.yml b/helper-scripts/docker-compose.override.yml.d/EXTERNAL_MYSQL_SOCKET/docker-compose.override.yml
index 53d9193bbd..3a42c1c383 100644
--- a/helper-scripts/docker-compose.override.yml.d/EXTERNAL_MYSQL_SOCKET/docker-compose.override.yml
+++ b/helper-scripts/docker-compose.override.yml.d/EXTERNAL_MYSQL_SOCKET/docker-compose.override.yml
@@ -1,4 +1,3 @@
-version: '2.1'
 services:
 
     php-fpm-mailcow:
diff --git a/helper-scripts/docker-compose.override.yml.d/HAPROXY/docker-compose.override.yml b/helper-scripts/docker-compose.override.yml.d/HAPROXY/docker-compose.override.yml
index 5009f4c94f..4e1166a460 100644
--- a/helper-scripts/docker-compose.override.yml.d/HAPROXY/docker-compose.override.yml
+++ b/helper-scripts/docker-compose.override.yml.d/HAPROXY/docker-compose.override.yml
@@ -2,7 +2,6 @@
 ## Set haproxy_trusted_networks in Dovecots extra.conf!
 ##
 
-version: '2.1'
 services:
 
     dovecot-mailcow: