diff --git a/requirements.txt b/requirements.txt
index c2352bbc8..0347a5cc1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -123,7 +123,7 @@ pillow==5.4.1
 # Plone
 #   CVE-2017-5524
 plone==5.1.5
-plone==4.3.18    # rq.filter: >=4, <5
+plone==5.2.3    # rq.filter: >=4, <5
 
 # priority
 #   CVE-2016-6580