diff --git a/.travis.yml b/.travis.yml
index dea38e7..d2d2b29 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -10,6 +10,12 @@ cache: bundler
 
 addons:
   postgresql: 9.5
+  apt:
+    packages:
+    - gifsicle
+    - jpegoptim
+    - optipng
+    - jhead
 
 rvm:
   - 2.3.1