diff --git a/docker-compose-javaworker.yml b/docker-compose-javaworker.yml
index a35458b..df9f117 100644
--- a/docker-compose-javaworker.yml
+++ b/docker-compose-javaworker.yml
@@ -1,4 +1,4 @@
-version: "2"
+version: "3"
 
 services:
   vote:
diff --git a/docker-compose-simple.yml b/docker-compose-simple.yml
index 289b9d2..aef4b75 100644
--- a/docker-compose-simple.yml
+++ b/docker-compose-simple.yml
@@ -1,4 +1,4 @@
-version: "2"
+version: "3"
 
 services:
   vote:
diff --git a/docker-compose.yml b/docker-compose.yml
index efc3e6f..c5460ee 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -1,4 +1,4 @@
-version: "2"
+version: "3"
 
 services:
   vote: