diff --git a/requirements.txt b/requirements.txt
index 908b66a..c2c6c25 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,9 +3,9 @@ pyopenssl==16.2.0
 requests==2.13.0
 
 # Secondary requirements
-cffi==1.10.0
-cryptography==2.0.3
+cffi==1.12.2
+cryptography==2.6.1
 idna==2.5
 pyasn1==0.4.4
-pycparser==2.17
-six==1.10.0
+pycparser==2.19
+six==1.12.0