diff --git a/docker-compose.yml b/docker-compose.yml
index 13d14f475cd..e52ed0db932 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -1,5 +1,3 @@
-version: "3.4"
-
 x-backend: &backend
   build:
     context: .
diff --git a/docs/CONTRIBUTING.md b/docs/CONTRIBUTING.md
index f2feaf4013f..156bd45902b 100644
--- a/docs/CONTRIBUTING.md
+++ b/docs/CONTRIBUTING.md
@@ -558,7 +558,6 @@ For example, in order to specify a set of Github OAuth Client credentials, a
 `docker-compose.override.yml` file might look like this:
 
 ```yaml
-version: '3'
 services:
   backend:
     environment: