diff --git a/concurrency-overview/requirements.txt b/concurrency-overview/requirements.txt
index 3d5f357..7558db9 100644
--- a/concurrency-overview/requirements.txt
+++ b/concurrency-overview/requirements.txt
@@ -33,6 +33,6 @@ sortedcontainers==2.0.4
 tqdm==4.25.0
 trio==0.6.0
 typed-ast==1.1.0
-urllib3==1.23
+urllib3==1.26.5
 wrapt==1.10.11
 yarl==1.2.6