diff --git a/docker-compose.override.yml b/docker-compose.override.yml
index f03dd90..735341c 100644
--- a/docker-compose.override.yml
+++ b/docker-compose.override.yml
@@ -1,7 +1,5 @@
 ---
 
-version: '3'
-
 services:
   exercises:
     volumes:
diff --git a/docker-compose.yml b/docker-compose.yml
index e4c0803..ac87dc6 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -1,7 +1,5 @@
 ---
 
-version: '3'
-
 services:
   exercises:
     build: .