diff --git a/requirements.txt b/requirements.txt
index d35b983..d9f2130 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -26,7 +26,7 @@ git+git://github.com/RDFLib/rdflib@6cb0dabce15a0d5dc81954ecb833e31b47a68e28#egg=
 # frozen stable:
 appdirs==1.4.3
 cachetools==2.0.0
-certifi==2017.4.17
+certifi==2022.12.7
 chardet==3.0.3
 click==6.7
 cycler==0.10.0