diff --git a/build-requirements-3.3.txt b/build-requirements-3.3.txt
index 9bc44683..9d486f78 100644
--- a/build-requirements-3.3.txt
+++ b/build-requirements-3.3.txt
@@ -6,3 +6,4 @@ virtualenv==15.2.0
 enum34
 hypothesis<3.44
 coverage==4.5.4
+urllib3<=1.25.8