diff --git a/roles/common/templates/tarsnap_sources.list.j2 b/roles/common/templates/tarsnap_sources.list.j2
index b1dc68b..cf67962 100644
--- a/roles/common/templates/tarsnap_sources.list.j2
+++ b/roles/common/templates/tarsnap_sources.list.j2
@@ -1 +1 @@
-deb [arch=amd64] https://pkg.tarsnap.com/deb/{{ ansible_distribution_release }} ./
+deb [arch=amd64 signed-by=/etc/apt/keyrings/tarsnap-deb-packaging-key.asc] https://pkg.tarsnap.com/deb/{{ ansible_distribution_release }} ./