update travis
diff --git a/.travis.yml b/.travis.yml
index b6847ef..af9b6eb 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -19,7 +19,7 @@
       - g++-4.8
       - gcc-4.8-multilib
       - g++-4.8-multilib
-      - python2.7
+      - python3
       - wget
       - pkg-config
       - zip
@@ -46,8 +46,6 @@
   - gcc --version
   - which g++-4.8
   - g++ --version
-  - which python
-  - python -V
-  - which python2.7
-  - python2.7 -V
+  - which python3
+  - python3 -V
   - scripts/travis/ci.sh