diff --git a/concurrency-overview/requirements.txt b/concurrency-overview/requirements.txt
index 3d5f357..15dfd0e 100644
--- a/concurrency-overview/requirements.txt
+++ b/concurrency-overview/requirements.txt
@@ -5,7 +5,7 @@ async-generator==1.10
 async-timeout==3.0.1
 atomicwrites==1.2.0
 attrs==18.1.0
-certifi==2018.8.13
+certifi==2022.12.7
 chardet==3.0.4
 contextvars==2.3
 flake8==3.5.0