diff --git a/requirements.txt b/requirements.txt
index d9b8963..ad2cfa7 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,7 +7,7 @@
 attrs==21.2.0             # via automat, twisted
 autobahn==21.2.1
 automat==20.2.0           # via twisted
-cffi==1.14.6              # via cryptography
+cffi==1.15.1              # via cryptography
 constantly==15.1.0        # via twisted
 cryptography==3.4.8       # via autobahn, pyopenssl
 hyperlink==21.0.0         # via autobahn, twisted