diff --git a/requirements.txt b/requirements.txt
index e4a0194..7e7d9e2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,3 +11,4 @@ black==20.8b1; platform.python_implementation!='PyPy'
 diff-cover
 autoflake
 pre-commit
+urllib3>=1.24.2,<2.0.0