diff --git a/dev-requirements.txt b/dev-requirements.txt
index fd07015..fa8ca16 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -37,7 +37,7 @@ soupsieve==2.1
 toml==0.10.2
 translationstring==1.4
 typing-extensions==3.7.4.3
-urllib3==1.26.2
+urllib3==1.26.4
 venusian==3.0.0
 waitress==1.4.4
 WebOb==1.8.6