diff --git a/requirements.txt b/requirements.txt
index 193512a..7241480 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,7 +6,7 @@
 #
 aiodns==1.1.1
 asn1crypto==0.24.0        # via cryptography
-cffi==1.11.0              # via cryptography
+cffi==1.13.2              # via cryptography
 cryptography==2.5       # via pyopenssl
 deprecation==1.0.1        # via nicfit.py
 idna==2.6                 # via cryptography