CI: pip<21 for Python 2.7

diff --git a/.travis.yml b/.travis.yml
index 69521f1017b6de7e3e24802e6505386643f51c19..bcb4d075522255c7789820fc0634fd3e5abc0983 100644 (file)
--- a/.travis.yml
+++ b/.travis.yml
@@ -27,7 +27,7 @@ matrix:
     env: TOXENV=pypy
 
 install:
-  - travis_retry pip install --upgrade "pip<19.1" "setuptools<44" tox ppu
+  - travis_retry pip install --upgrade "pip<21" "setuptools<44" tox ppu
 
 script:
   - tox