diff --git a/dev-requirements.txt b/dev-requirements.txt
index 40fa4f2..03cc422 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -53,6 +53,6 @@ sphinxcontrib-serializinghtml==1.1.3
 tqdm==4.28.1
 twine==1.12.1
 typed-ast==1.3.1
-urllib3==1.24.1
+urllib3==1.26.5
 webencodings==0.5.1
 wrapt==1.11.1