diff --git a/.travis.yml b/.travis.yml
index 7e634ceb..34a51228 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -16,7 +16,7 @@ cache:
 before_install:
   - sudo apt-get -y install python3-dev python3-pip python3-setuptools python3-wheel libopenmpi-dev
   - sudo pip3 install -U --upgrade pip
-  - sudo pip3 install -U --only-binary=numpy pillow gym==0.10.5 atari_py pillow tensorflow opencv-python joblib mpi4py six scipy
+  - sudo pip3 install -U --only-binary=numpy pillow gym==0.10.5 atari_py pillow tensorflow opencv-python joblib mpi4py six scipy cffi
 
 before_script:
   - rustup component add rustfmt-preview