diff --git a/.travis.yml b/.travis.yml
index 289b05f..9a16f12 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -13,7 +13,7 @@ install:
 before_script:
   # Build docker image
   - docker build -t adyen-card-tester .
-  - docker run -d -p 127.0.0.1:80:5000 -e ADYEN_KEY="adyen public key" --name adyen-card-tester adyen-card-tester
+  - docker run -d -p 127.0.0.1:80:4444 -e ADYEN_KEY="adyen public key" --name adyen-card-tester adyen-card-tester
   - wget --quiet 127.0.0.1:80
 
 script:
diff --git a/Dockerfile b/Dockerfile
index 781703a..a5bde93 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -12,4 +12,6 @@ COPY app.js .
 COPY js js
 COPY views views
 
+EXPOSE 4444
+
 CMD [ "node", "app.js" ]
diff --git a/README.md b/README.md
index 7c404a3..0a4cb71 100644
--- a/README.md
+++ b/README.md
@@ -16,7 +16,7 @@ docker pull imacatlol/adyen-card-tester
 Then run the container with the following command and replace ```ADYEN_KEY``` with your Adyen public key.
 ```bash
 docker run -d --name adyen-card-tester \
-	-p 127.0.0.1:4444:5000 \
+	-p 127.0.0.1:4444:4444 \
 	-e ADYEN_KEY="adyen public key" \
 	imacatlol/adyen-card-tester
 ```
diff --git a/app.js b/app.js
index 1e9d1cb..144d369 100644
--- a/app.js
+++ b/app.js
@@ -21,6 +21,6 @@ app.get('/cvc', function(req, res) {
     res.render('cvc', { apiKey: apiKey, cardActive: '', cvcActive: 'active' })
 });
 
-server = app.listen(5000)
+server = app.listen(4444)
 
 module.exports = server