diff --git a/lib/mastodon/redis_config.rb b/lib/mastodon/redis_config.rb
index a286edc09f..6b81466e82 100644
--- a/lib/mastodon/redis_config.rb
+++ b/lib/mastodon/redis_config.rb
@@ -52,7 +52,7 @@ REDIS_CACHE_PARAMS = {
   driver: :hiredis,
   url: ENV['CACHE_REDIS_URL'],
   expires_in: 10.minutes,
-  namespace: cache_namespace,
+  namespace: "#{cache_namespace}:7.1",
   connect_timeout: 5,
   pool: {
     size: Sidekiq.server? ? Sidekiq[:concurrency] : Integer(ENV['MAX_THREADS'] || 5),