diff --git a/requirements.txt b/requirements.txt
index 99d432c..0fa83da 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -24,4 +24,4 @@ pyparsing==2.2.0
 service-identity==17.0.0
 six==1.11.0
 twisted[tls]==18.4.0
-zope.interface==4.4.3
+zope.interface==4.5.0