diff --git a/core/requirements.txt b/core/requirements.txt
index 48d2917..b100b91 100644
--- a/core/requirements.txt
+++ b/core/requirements.txt
@@ -1,5 +1,5 @@
 # This is a separate file from Dockerfile so that we can use dependabot
 # for version updates that isn't supported for contents inside the
 # Dockerfile.
-mailman==3.3.8
+mailman==3.3.9
 mailman-hyperkitty==1.2.1
\ No newline at end of file