diff --git a/requirements.txt b/requirements.txt
index d7fe510..92168f4 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 h2==2.4.0
 Twisted==16.3.0
-pyOpenSSL==16.0.0
+pyOpenSSL==17.5.0
 priority==1.1.1
 service_identity
 idna