diff --git a/.travis.yml b/.travis.yml
index a21c512867de66bee312984565986ccf0cefbc5e..6c204cccd9ca87351b237bc281ba2251bef76891 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -23,6 +23,7 @@ addons:
     # install pandoc for use with pypandoc for converting the README
     # from markdown to RST
     - pandoc
+    - libssl1.0.0
 install:
   - >
       conda create -q -n test-environment python=$TRAVIS_PYTHON_VERSION