diff --git a/requirements.txt b/requirements.txt
index 7942933..193512a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,7 +7,7 @@
 aiodns==1.1.1
 asn1crypto==0.24.0        # via cryptography
 cffi==1.11.0              # via cryptography
-cryptography==2.1.4       # via pyopenssl
+cryptography==2.5       # via pyopenssl
 deprecation==1.0.1        # via nicfit.py
 idna==2.6                 # via cryptography
 lxml==4.1.1