diff --git a/roles/matrix-synapse/tasks/main.yaml b/roles/matrix-synapse/tasks/main.yaml
index 45bd772..8b8c1a1 100644
--- a/roles/matrix-synapse/tasks/main.yaml
+++ b/roles/matrix-synapse/tasks/main.yaml
@@ -20,8 +20,8 @@
     repo: '{{ item }}'
     state: 'present'
   loop:
-    - 'deb https://packages.matrix.org/debian/ buster main'
-    - 'deb-src https://packages.matrix.org/debian/ buster main'
+    - 'deb https://packages.matrix.org/debian/ bullseye main'
+    - 'deb-src https://packages.matrix.org/debian/ bullseye main'
   tags:
     - 'packages'