diff --git a/requirements.txt b/requirements.txt
index 577c47fba6..f9c238b873 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -264,7 +264,7 @@ papersize==1.3.0
     # via pdfimpose
 pdfimpose==1.1.0
     # via geotrek (setup.py)
-persistent==6.0
+persistent==6.1
     # via
     #   btrees
     #   zodb