diff --git a/docker-compose.base.yml b/docker-compose.base.yml
index ee0d60d0..8ab70fb8 100644
--- a/docker-compose.base.yml
+++ b/docker-compose.base.yml
@@ -1,5 +1,3 @@
-version: "3.5"
-
 services:
   db:
     # Docker image docs: https://github.com/bitnami/bitnami-docker-postgresql
diff --git a/docker-compose.dev.yml b/docker-compose.dev.yml
index df1310b3..1c880321 100644
--- a/docker-compose.dev.yml
+++ b/docker-compose.dev.yml
@@ -1,5 +1,3 @@
-version: "3.5"
-
 services:
   db:
     environment:
diff --git a/docker-compose.extra.yml b/docker-compose.extra.yml
index 4cd89b6c..2a6c5530 100644
--- a/docker-compose.extra.yml
+++ b/docker-compose.extra.yml
@@ -1,5 +1,3 @@
-version: "3.5"
-
 services:
   seek:
     image: crs4/lifemonitor-tests:seek
diff --git a/docker-compose.maintenance.yml b/docker-compose.maintenance.yml
index 6974e215..17646c29 100644
--- a/docker-compose.maintenance.yml
+++ b/docker-compose.maintenance.yml
@@ -1,5 +1,3 @@
-version: "3.5"
-
 services:
   db:
     environment:
diff --git a/docker-compose.monitoring.yml b/docker-compose.monitoring.yml
index 2e17806e..56983999 100644
--- a/docker-compose.monitoring.yml
+++ b/docker-compose.monitoring.yml
@@ -1,5 +1,3 @@
-version: "3.5"
-
 services:
   prometheus:
     image: prom/prometheus:v2.48.0
diff --git a/docker-compose.test.yml b/docker-compose.test.yml
index c2fe73b1..046066eb 100644
--- a/docker-compose.test.yml
+++ b/docker-compose.test.yml
@@ -1,5 +1,3 @@
-version: "3.5"
-
 services:
   lmtests:
     image: crs4/lifemonitor