diff --git a/requirements.txt b/requirements.txt
index 2571ba2ea..af3df3b06 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -35,6 +35,7 @@ patch>=1.16,<2.0
 pathlib>=1.0
 pathlib2>=2.3.0
 Pillow>=3.0
+pip>=9.0.1,!=9.0.2,!=9.0.3	# Earlier pip has issues, 9.0.2 and 9.0.3 leaves dross when down- and up-grading packages
 pyang>=1.7.2,<2.0
 pyflakes>=0.9.2
 pyopenssl>=17.5.0		# Used by urllib3.contrib, which is used by PyQuery but not marked as a dependency