diff --git a/Dockerfile b/Dockerfile
index 0b36037d..a781e70c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,6 @@
 FROM osem/base
 ARG CONTAINER_USERID
+ARG OSEM_RUBY_VERSION
 
 # Configure our user
 RUN usermod -u $CONTAINER_USERID osem
diff --git a/docker-compose.override.yml.example b/docker-compose.override.yml.example
index f5dca21d..7621ec67 100644
--- a/docker-compose.override.yml.example
+++ b/docker-compose.override.yml.example
@@ -4,3 +4,4 @@ services:
     build:
       args:
         CONTAINER_USERID: 13042
+        OSEM_RUBY_VERSION: 2.5.8
diff --git a/docker-compose.yml b/docker-compose.yml
index 8f31749c..6c6b50dd 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -10,6 +10,7 @@ services:
       context: .
       args:
         CONTAINER_USERID: 1000
+        OSEM_RUBY_VERSION: 2.5.0
     command: /osem/bin/osem-init.sh
     depends_on:
       - database