diff --git a/.travis.yml b/.travis.yml
index d428769..c55b01a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,4 @@
 language: python
-sudo: false
 branches:
     only:
         - master
diff --git a/setup.py b/setup.py
index c5258f5..d0cb683 100644
--- a/setup.py
+++ b/setup.py
@@ -24,6 +24,7 @@ def read(fname):
         'scikit-learn>=0.18',
         'scipy>=0.18',
         'webstruct>=0.4',
+        'parsel>=1.4',
     ],
     long_description=read('README.rst'),
     classifiers=[