diff --git a/.travis.yml b/.travis.yml
index eeb79a1..ef11752 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -21,8 +21,6 @@ env:
   - TOX_ENV=flake8
 
 script:
-  # note: pip>9.0 does not support current pypy3
-  - pip install -U 'pip<9.0'
   - tox -e $TOX_ENV
 
 notifications:
diff --git a/requirements-tests.txt b/requirements-tests.txt
index 9299da7..842bd68 100644
--- a/requirements-tests.txt
+++ b/requirements-tests.txt
@@ -1,2 +1,4 @@
+# note: pip>9.0 does not support current pypy3
+pip<9.0
 pytest
 pytz