diff --git a/requirements.txt b/requirements.txt
index 1ec17a7..abc947a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,7 @@
 alabaster==0.7.10
 Babel==2.5.3
 bluepy==1.1.4
-certifi==2018.1.18
+certifi==2021.5.30
 chardet==3.0.4
 docutils==0.14
 idna==2.6