diff --git a/requirements.txt b/requirements.txt
index 7a3261a..875c764 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -39,4 +39,4 @@ venusian==3.0.0
 waitress==1.4.3
 WebOb==1.8.6
 zope.deprecation==4.4.0
-zope.interface==5.0.2
+zope.interface==5.1.0