diff --git a/.travis.yml b/.travis.yml
index 73341b6..1859d11 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,10 +8,11 @@ python:
   # does not have headers provided, please ask https://launchpad.net/~pypy/+archive/ppa
   # maintainers to fix their pypy-dev package.
   - "pypy"
-before_install: sudo apt-get install tree
+before_install: 
+  - sudo apt-get install glpk
+  - sudo apt-get install coinor-cbc
 # command to install dependencies
 install:
   - pip install .
-before_script: tree
 # command to run tests
 script: pulptest
\ No newline at end of file