diff --git a/.travis.yml b/.travis.yml
index 19fd66c1..7e334059 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -24,18 +24,14 @@ before_install:
   - pushd cyrus-sasl2-2.1.27~101-g0780600+dfsg.orig && ./autogen.sh && make && sudo make install && popd
 
 install:
-  - sudo apt install -y libssl-dev libsqlite3-dev libbz2-dev zlib1g-dev
+  - sudo apt install -y libssl-dev libsqlite3-dev libbz2-dev zlib1g-dev python3.5-dev 
 
 script:
   - mkdir -p builddir && cd builddir && meson && ninja -v && sudo ninja install 
   - export LD_LIBRARY_PATH=/usr/local/lib/x86_64-linux-gnu:$LD_LIBRARY_PATH 
   - sudo ldconfig -v 
   - cd ../python
-  - virtualenv venv
+  - virtualenv -p /usr/bin/python3.5 venv
   - source venv/bin/activate
-  - hash -r
-  - pip install -e . 
-  - pip install pytest
-  # - python -c 'import queue; print (queue)'
-  # import error with "queue", how can this happen? 
-  # - pytest tests
+  - pip install tox 
+  - tox