diff --git a/lib/volumen/server.rb b/lib/volumen/server.rb
index e7846c6..a0f7226 100644
--- a/lib/volumen/server.rb
+++ b/lib/volumen/server.rb
@@ -23,10 +23,12 @@ module Volumen
     # Returns a configured subclass bound to a specific config + store.
     def self.configured(config:, store:)
       secret = session_secret(config)
+      ttl = config.admin["session_ttl"].to_i
+      ttl = nil if ttl <= 0
       Class.new(self) do
         set :volumen_config, config
         set :volumen_store, store
-        set :sessions, httponly: true, same_site: :strict
+        set :sessions, httponly: true, same_site: :strict, expire_after: ttl
         set :session_secret, secret
       end
     end