diff --git a/.travis.yml b/.travis.yml
index 9896ed0..ca83d67 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,11 +1,11 @@
 language: c
 sudo: false
-dist: xenial
+dist: bionic
 services:
     - xvfb
 env:
-    global: PYTHON_VERSION=3.7
-            CONDA_DEPENDENCIES="numpy scipy matplotlib pyqt>=5.9 coverage pytest pytest-cov flake8 pygments traits traitsui pyface"
+    global: PYTHON_VERSION=3.8
+            CONDA_DEPENDENCIES="numpy scipy matplotlib pyqt coverage pytest pytest-cov flake8 pygments traits traitsui pyface"
             PIP_DEPENDENCIES="codecov pytest-sugar pytest-faulthandler nibabel imageio imageio-ffmpeg"
             DISPLAY=:99.0
             SUBJECTS_DIR=~/subjects
@@ -18,10 +18,15 @@ matrix:
             apt:
               packages:
                 - mencoder
+                - libosmesa6
+                - libglx-mesa0
+                - libopengl0
+                - libglx0
+                - libdbus-1-3
 
         # 3.5, no mencoder
         - os: linux
-          env: PYTHON_VERSION=3.5
+          env: PYTHON_VERSION=3.6
                CONDA_DEPENDENCIES="numpy scipy matplotlib coverage pytest pytest-cov flake8"
                PIP_DEPENDENCIES="codecov pytest-sugar nibabel imageio imageio-ffmpeg"
 
@@ -37,14 +42,15 @@ before_install:
       fi;
     - git clone https://github.com/astropy/ci-helpers.git
     - source ci-helpers/travis/setup_conda.sh
-    - pip install vtk
-    - pip install mayavi
-    - mkdir -p $SUBJECTS_DIR
-    - if [ "${PYTHON_VERSION}" == "3.5" ]; then
-        pip install "mne<0.21";
+    - if [ "${PYTHON_VERSION}" == "3.6" ]; then
+        pip install --only-binary ":all:" "vtk<9";
+        pip install mayavi;
       else
-        pip install "https://api.github.com/repos/mne-tools/mne-python/zipball/master";
+        pip install --only-binary ":all:" -f "https://vtk.org/download" "vtk>=9";
+        pip install https://github.com/enthought/mayavi/zipball/master;
       fi;
+    - mkdir -p $SUBJECTS_DIR
+    - pip install "https://api.github.com/repos/mne-tools/mne-python/zipball/master";
     - python -c "import mne; mne.datasets.fetch_fsaverage(verbose=True)"
 
 install:
diff --git a/doc/install.rst b/doc/install.rst
index 91b5691..5fc7d13 100644
--- a/doc/install.rst
+++ b/doc/install.rst
@@ -30,10 +30,7 @@ install from your local source directory::
 Dependencies
 ~~~~~~~~~~~~
 
-PySurfer works on Python 2.7 and 3.6+.
-(Older Python 3 versions will probably work, but are not tested.)
-
-To use PySurfer, you will need to have the following Python packages:
+PySurfer works on Python 3.6+ and requires the following Python packages:
 
 * numpy_
 * scipy_
@@ -91,4 +88,3 @@ as a static PNG image, or ``'x3d'`` to render it using
 If you are having trouble getting started using PySurfer, please describe the problem on the `nipy mailing list`_.
 
 .. include:: links_names.txt
-
diff --git a/setup.py b/setup.py
index 7df6fbd..3d53a9a 100644
--- a/setup.py
+++ b/setup.py
@@ -66,6 +66,8 @@
           platforms='any',
           packages=['surfer', 'surfer.tests'],
           scripts=['bin/pysurfer'],
-          install_requires=['numpy', 'scipy', 'matplotlib', 'nibabel >= 1.2', 'mayavi'],
+          python_requires='>=3.6',
+          install_requires=[
+              'numpy', 'scipy', 'matplotlib', 'nibabel >= 1.2', 'mayavi'],
           extras_require={'save_movie': ['imageio >= 1.5']},
           )