diff --git a/requirements_dev.txt b/requirements_dev.txt
index 6008d8f..e61172c 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -3,7 +3,7 @@ bleach==3.1.0
 certifi==2019.11.28
 cffi==1.13.2
 chardet==3.0.4
-cryptography==2.8
+cryptography==39.0.1
 docutils==0.15.2
 filelock==3.0.12
 idna==2.8