diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index d973b79..1714b7f 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -34,6 +34,8 @@ Other
 
 - Fix configuration for AppVeyor: simplify the test scripts and set the version format to match the current version.
 
+- Change configuration for Tox: change the requirements for ``pip`` to "pip >= 9.0.3, < 21" (Python 2.7, 3.4 and 3.5).
+
 
 v1.2.12 (2021-03-13)
 ====================
diff --git a/tox.ini b/tox.ini
index c005540..360a20c 100644
--- a/tox.ini
+++ b/tox.ini
@@ -18,7 +18,7 @@ envlist =
 [testenv]
 commands = pytest --cov-report term-missing --cov=deprecated tests/
 deps =
-    py27,py34,py35: pip >= 9.0.3, < 19.2
+    py27,py34,py35: pip >= 9.0.3, < 21
     py27,py34: PyTest < 5
     py35,py36,py37,py38,py39,pypy,pypy3: PyTest
     py27,py34: PyTest-Cov < 2.6