diff --git a/Gemfile b/Gemfile
index dd880219..7e1beda9 100644
--- a/Gemfile
+++ b/Gemfile
@@ -78,6 +78,7 @@ gem 'validates_hostname'
 gem 'webpacker'
 gem 'yaml_db', git: 'https://0xacab.org/sutty/yaml_db.git'
 gem 'kaminari'
+gem 'device_detector'
 
 # database
 gem 'hairtrigger'
diff --git a/config/initializers/device_detector.rb b/config/initializers/device_detector.rb
new file mode 100644
index 00000000..95500315
--- /dev/null
+++ b/config/initializers/device_detector.rb
@@ -0,0 +1,3 @@
+DeviceDetector.configure do |config|
+    config.max_cache_keys = 5_000 # to check if not too much
+  end
\ No newline at end of file