diff --git a/.travis.yml b/.travis.yml
index 5ecd14ec536528d1fda3d12a0c0728d5ea4b3d88..56df67f40666f0811468c1e9501cfde528963dac 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -58,7 +58,7 @@ before_install:
   - pip install --upgrade wheel
   # Set numpy version first, other packages link against it
   - pip install six nose coverage codecov pytest pytest-cov coveralls codacy-coverage parameterized secp256k1prp cryptography scrypt
-  - pip install pycryptodomex  pyyaml appdirs pylibscrypt
+  - pip install pycryptodomex  pyyaml appdirs pylibscrypt tox
   - pip install ecdsa requests future websocket-client pytz six Click events prettytable
 
 script: