diff --git a/elk/docker-compose.yml b/elk/docker-compose.yml
index b1e1e1a1..e77b97ac 100644
--- a/elk/docker-compose.yml
+++ b/elk/docker-compose.yml
@@ -2,14 +2,14 @@ version: "2"
 
 services:
   elasticsearch:
-    image: elasticsearch
+    image: elasticsearch:2
     # If you need to access ES directly, just uncomment those lines.
     #ports:
     #  - "9200:9200"
     #  - "9300:9300"
 
   logstash:
-    image: logstash
+    image: logstash:2
     command: |
       -e '
       input {
@@ -47,7 +47,7 @@ services:
       - "12201:12201/udp"
 
   kibana:
-    image: kibana
+    image: kibana:4
     ports:
       - "5601:5601"
     environment:
diff --git a/slides/containers/Logging.md b/slides/containers/Logging.md
index 0fa11d95..ecb24cb2 100644
--- a/slides/containers/Logging.md
+++ b/slides/containers/Logging.md
@@ -194,9 +194,13 @@ will have equal success with Fluent or other logging stacks!*
 
 - We are going to use a Compose file describing the ELK stack.
 
+- The Compose file is in the container.training repository on GitHub.
+
 ```bash
-$ cd ~/container.training/stacks
-$ docker-compose -f elk.yml up -d
+$ git clone https://github.com/jpetazzo/container.training
+$ cd container.training
+$ cd elk
+$ docker-compose up
 ```
 
 - Let's have a look at the Compose file while it's deploying.
diff --git a/stacks/elk.yml b/stacks/elk.yml
index d2460b39..ce1edab4 100644
--- a/stacks/elk.yml
+++ b/stacks/elk.yml
@@ -5,7 +5,7 @@ services:
     image: elasticsearch:2
 
   logstash:
-    image: logstash
+    image: logstash:2
     command: |
       -e '
       input {