diff --git a/.travis.yml b/.travis.yml
index b9f5ca0..e164b5f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,7 +6,7 @@ language: python
 # language: java
 
 python:
-    - "2.7"
+    - "3.6"
 
 # install: true
 install:
diff --git a/requirements.txt b/requirements.txt
index 84cc81d..3290a5f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,3 @@
 # Python requirements file with packages needed to build the documentation.
-# Sphinx==1.3b2
-Sphinx==1.6.2
+Sphinx==1.8.2
 sphinx-rtd-theme