diff --git a/requirements.txt b/requirements.txt
index 2211033..cfdada4 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 atomicwrites==1.2.1
 attrs==18.2.0
-certifi==2018.10.15
+certifi==2019.11.28
 chardet==3.0.4
 idna==2.7
 more-itertools==4.3.0