diff --git a/.travis.yml b/.travis.yml
index 9e5ba36..03848b5 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,7 +6,8 @@ python:
 sudo: false
 install:
     - pip install -U pip
-    - pip install ".[test]" coveralls
+    - pip install -U --upgrade-strategy eager ".[test]" coveralls
+    - pip freeze
 script:
     - nosetests --with-coverage --cover-package traittypes traittypes
 after_success:
diff --git a/setup.py b/setup.py
index 774c7ab..237f076 100644
--- a/setup.py
+++ b/setup.py
@@ -83,7 +83,9 @@
 
 extras_require = setuptools_args['extras_require'] = {
     'test': [
-        'numpy',
+        # TestIntArray.test_bad_values fails with numpy>=1.16.0
+        'numpy<1.16.0',
+
         'pandas',
         'xarray',
         'pytest',  # traitlets[test] require this