diff --git a/docker/docker-compose.ci.yml b/docker/docker-compose.ci.yml
index 0a3868f364..9a90742269 100644
--- a/docker/docker-compose.ci.yml
+++ b/docker/docker-compose.ci.yml
@@ -1,7 +1,6 @@
 # Extra services and overridden parameters for testing in a CI-environment.
 # Mongo-express and PHPLDAPAdmin are not started.
 
-version: "3"
 services:
   www:
     build: ../components/proxy
diff --git a/docker/docker-compose.override.yml b/docker/docker-compose.override.yml
index 01edf81d6d..6ce5161110 100644
--- a/docker/docker-compose.override.yml
+++ b/docker/docker-compose.override.yml
@@ -1,6 +1,5 @@
 # Extra services and overridden parameters for development
 
-version: "3"
 services:
   www:
     build: ../components/proxy
diff --git a/docker/docker-compose.yml b/docker/docker-compose.yml
index bbdb54b5b4..d9e80ca256 100644
--- a/docker/docker-compose.yml
+++ b/docker/docker-compose.yml
@@ -1,6 +1,5 @@
 # Base docker composition. For development, this composition is augmented in docker-compose.override.yml.
 
-version: '3'
 services:
   www:
     image: ictu/quality-time_proxy:${QUALITY_TIME_VERSION}