diff --git a/.travis.yml b/.travis.yml
index efec44a949ee35695978b66929d2cb6d8d902df8..182bda00f81549e1c54a28278e55870e7504eb81 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -48,7 +48,7 @@ before_install:
   - conda info -a
 
 install:
-  - conda create -q -n test-environment python=$TRAVIS_PYTHON_VERSION pyqt5 libpng=1.5.13 libsodium=1.0.3
+  - conda create -q -n test-environment python=$TRAVIS_PYTHON_VERSION pyqt5 libpng libsodium=1.0.3
   - source activate test-environment
   - ldd $HOME/miniconda/envs/test-environment/lib/qt5/plugins/platforms/*.so
   - pip install coveralls cx_Freeze