diff --git a/hosts/jokum/services/matrix/synapse.nix b/hosts/jokum/services/matrix/synapse.nix
index 467b5253..db1a6f94 100644
--- a/hosts/jokum/services/matrix/synapse.nix
+++ b/hosts/jokum/services/matrix/synapse.nix
@@ -52,6 +52,12 @@ in {
 
       presence.enabled = false;
 
+      caches = {
+        per_cache_factors = {
+          _event_auth_cache = 2.0;
+        };
+      };
+
       autocreate_auto_join_rooms = false;
       auto_join_rooms = [
         "#pvv:pvv.ntnu.no" # Main space