diff --git a/.travis.yml b/.travis.yml
index 07c573f..09f5136 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -21,7 +21,7 @@ install:
   # checkcode dependencies:
   - pip install flake8 pycodestyle doc8 Pygments
   # test dependencies:
-  - pip install pytest
+  - pip install -U pytest
 
 script:
   - scripts/checkcode.sh .