diff --git a/.travis.yml b/.travis.yml
index 1b3ca98..942e98a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -25,23 +25,28 @@ matrix:
     env: TEST_TARGET=docs PY=3.7
 
 before_install:
-  - wget http://bit.ly/miniconda -O miniconda.sh
-  - bash miniconda.sh -b -p $HOME/miniconda
-  - export PATH="$HOME/miniconda/bin:$PATH"
-  - conda config --set always_yes yes --set changeps1 no --set show_channel_urls true
-  - conda update conda
-  - conda config --remove channels defaults --force
-  - conda config --add channels conda-forge --force
-  - conda create --name TEST python=$PY --file requirements.txt --file requirements-dev.txt
-  - source activate TEST
-  # firefox headless driver
-  - wget https://github.com/mozilla/geckodriver/releases/download/v0.23.0/geckodriver-v0.23.0-linux64.tar.gz -O geckodriver.tar.gz
-  - mkdir geckodriver
-  - tar -xzf geckodriver.tar.gz -C geckodriver
-  - export PATH=$PATH:$PWD/geckodriver
+  # Install miniconda and create TEST env.
+  - |
+    wget http://bit.ly/miniconda -O miniconda.sh
+    bash miniconda.sh -b -p $HOME/miniconda
+    export PATH="$HOME/miniconda/bin:$PATH"
+    conda config --set always_yes yes --set changeps1 no --set show_channel_urls true
+    conda update conda --quiet
+    conda config --add channels conda-forge --force
+    conda install pycryptosat
+    conda config --set channel_priority strict
+    conda config --set safety_checks disabled
+    conda create --name TEST python=$PY --file requirements.txt --file requirements-dev.txt
+    source activate TEST
+  # Install firefox headless driver.
+  - |
+    wget https://github.com/mozilla/geckodriver/releases/download/v0.23.0/geckodriver-v0.23.0-linux64.tar.gz -O geckodriver.tar.gz
+    mkdir geckodriver
+    tar -xzf geckodriver.tar.gz -C geckodriver
+    export PATH=$PATH:$PWD/geckodriver
 
 install:
-    - python setup.py sdist && version=$(python setup.py --version) && pushd dist  && pip install branca-${version}.tar.gz && popd
+    - python setup.py sdist && version=$(python setup.py --version) && pushd dist  && pip install --no-deps --force-reinstall branca-${version}.tar.gz && popd
 
 script:
   - if [[ $TEST_TARGET == 'default' ]]; then