diff --git a/constraints.txt b/constraints.txt
index ec4a10b70d..3b8d4ac5b0 100644
--- a/constraints.txt
+++ b/constraints.txt
@@ -63,7 +63,7 @@ zope.globalrequest==2.0
 zope.hookable==6.0
 zope.i18n==5.1
 zope.i18nmessageid==6.1.0
-zope.interface==6.4
+zope.interface==6.3
 zope.lifecycleevent==5.0
 zope.location==5.0
 zope.pagetemplate==5.1
diff --git a/requirements-full.txt b/requirements-full.txt
index dac553088a..210aa9aa31 100644
--- a/requirements-full.txt
+++ b/requirements-full.txt
@@ -64,7 +64,7 @@ zope.globalrequest==2.0
 zope.hookable==6.0
 zope.i18n==5.1
 zope.i18nmessageid==6.1.0
-zope.interface==6.4
+zope.interface==6.3
 zope.lifecycleevent==5.0
 zope.location==5.0
 zope.pagetemplate==5.1
diff --git a/versions-prod.cfg b/versions-prod.cfg
index ab07d3d23a..a2e2b68b6c 100644
--- a/versions-prod.cfg
+++ b/versions-prod.cfg
@@ -61,7 +61,7 @@ zope.globalrequest = 2.0
 zope.hookable = 6.0
 zope.i18n = 5.1
 zope.i18nmessageid = 6.1.0
-zope.interface = 6.4
+zope.interface = 6.3
 zope.lifecycleevent = 5.0
 zope.location = 5.0
 zope.pagetemplate = 5.1