diff --git a/requirements.txt b/requirements.txt
index 1576fc8..96cc468 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -36,7 +36,7 @@ conda-build==3.18.11
 conda-package-handling==1.6.0
 conda-verify==3.4.2
 contextlib2==0.6.0.post1
-cryptography==2.8
+cryptography==39.0.1
 cycler==0.10.0
 Cython==0.29.15
 cytoolz==0.10.1