diff --git a/requirements.txt b/requirements.txt
index 8c947a2..8231d47 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-certifi==2019.11.28
+certifi==2021.5.30
 chardet==3.0.4
 coverage==5.0.3
 coveralls==1.11.1