diff --git a/pex-requirements.txt b/pex-requirements.txt
index e86e8d48..ceef3559 100644
--- a/pex-requirements.txt
+++ b/pex-requirements.txt
@@ -5,4 +5,4 @@ requests>=2.25.0,<3.0.0
 schema>=0.4.0
 setuptools
 tqdm>=4.0.0
-urllib3>=1.26.0
+urllib3>=1.26.0,<2.0.0