diff --git a/requirements.txt b/requirements.txt
index b6b31d591..62764725c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -13,3 +13,4 @@ requests>=2.13.0,<3.0.0
 regex==2017.4.5
 ftfy>=4.4.2,<5.0.0
 pytest>=3.0.6,<4.0.0
+pip>=9.0.0,<10.0.0
diff --git a/setup.py b/setup.py
index 39f35902f..bedc1b42f 100755
--- a/setup.py
+++ b/setup.py
@@ -193,6 +193,7 @@ def setup_package():
                 'preshed>=1.0.0,<2.0.0',
                 'thinc>=6.6.0,<6.7.0',
                 'plac<1.0.0,>=0.9.6',
+                'pip>=9.0.0,<10.0.0',
                 'six',
                 'pathlib',
                 'ujson>=1.35',