diff --git a/.docker/Dockerfile b/.docker/Dockerfile
index 37bfccf..ec98202 100644
--- a/.docker/Dockerfile
+++ b/.docker/Dockerfile
@@ -1,4 +1,4 @@
-FROM php:5.6-fpm
+FROM php:7.1-fpm
 
 RUN apt-get update
 
diff --git a/.travis.yml b/.travis.yml
index d1613c6..990045d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -24,6 +24,9 @@ script: make test
 
 jobs:
   include:
+    - php: 5.3
+      dist: precise
+      env: WP_VERSION=4.4 WC_VERSION=3.0.0 WP_MULTISITE=0
     - php: 5.4
       env: WP_VERSION=4.4 WC_VERSION=3.0.0 WP_MULTISITE=0
     - php: 5.6