diff --git a/.travis.yml b/.travis.yml
index 6e36fdc..c7bdc60 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -50,7 +50,25 @@ jobs:
         - ./generate-stackbrew-library.sh
 
     - stage: test images
-      env: VERSION=13.0 VARIANT=fpm-alpine ARCH=amd64
+      env: VERSION=13.0-rc VARIANT=fpm-alpine ARCH=amd64
+    - env: VERSION=13.0-rc VARIANT=fpm-alpine ARCH=i386
+    - env: VERSION=13.0-rc VARIANT=fpm ARCH=amd64
+    - env: VERSION=13.0-rc VARIANT=fpm ARCH=i386
+    - env: VERSION=13.0-rc VARIANT=apache ARCH=amd64
+    - env: VERSION=13.0-rc VARIANT=apache ARCH=i386
+    - env: VERSION=14.0-rc VARIANT=fpm-alpine ARCH=amd64
+    - env: VERSION=14.0-rc VARIANT=fpm-alpine ARCH=i386
+    - env: VERSION=14.0-rc VARIANT=fpm ARCH=amd64
+    - env: VERSION=14.0-rc VARIANT=fpm ARCH=i386
+    - env: VERSION=14.0-rc VARIANT=apache ARCH=amd64
+    - env: VERSION=14.0-rc VARIANT=apache ARCH=i386
+    - env: VERSION=15.0-rc VARIANT=fpm-alpine ARCH=amd64
+    - env: VERSION=15.0-rc VARIANT=fpm-alpine ARCH=i386
+    - env: VERSION=15.0-rc VARIANT=fpm ARCH=amd64
+    - env: VERSION=15.0-rc VARIANT=fpm ARCH=i386
+    - env: VERSION=15.0-rc VARIANT=apache ARCH=amd64
+    - env: VERSION=15.0-rc VARIANT=apache ARCH=i386
+    - env: VERSION=13.0 VARIANT=fpm-alpine ARCH=amd64
     - env: VERSION=13.0 VARIANT=fpm-alpine ARCH=i386
     - env: VERSION=13.0 VARIANT=fpm ARCH=amd64
     - env: VERSION=13.0 VARIANT=fpm ARCH=i386