diff --git a/.travis.yml b/.travis.yml
index 087409299..996c2d0dc 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,8 +7,9 @@ env:
     - PATH=$HOME/miniconda/bin:$PATH
     - common_py_deps="jinja2 conda-build"
   matrix:
-    - python=2.7  CONDA_PY=27  CONDA_NPY=18
-    - python=3.4  CONDA_PY=34  CONDA_NPY=18
+    # minimum possible numpy version = 1.8, because of mdtraj
+    - python=2.7  CONDA_PY=27  CONDA_NPY=19
+    - python=2.7  CONDA_PY=27  CONDA_NPY=110
     - python=3.4  CONDA_PY=34  CONDA_NPY=19
     - python=3.5  CONDA_PY=35  CONDA_NPY=110