diff --git a/COPYING.md b/COPYING.md
index 99f52c1f97..be77e1fd25 100644
--- a/COPYING.md
+++ b/COPYING.md
@@ -90,6 +90,7 @@ Lichess as deployed on https://lichess.org/ also uses these external services:
 * [Spreadshirt](https://shop.spreadshirt.com/lichess-org) for the [Swag store](https://lichess.org/swag)
 * [check.torproject.org](https://check.torproject.org/exit-addresses) for a list or Tor exit nodes
 * [getipintel.net](https://getipintel.net/)
+* [detectlanguage.com](https://detectlanguage.com/)
 * Fallback to [Google Fonts](https://fonts.google.com/)
 * [Google Cloud Messaging](https://developers.google.com/cloud-messaging/) and [OneSignal](https://onesignal.com/) for mobile notifications
 * [reCAPTCHA](https://www.google.com/recaptcha/)
diff --git a/conf/base.conf b/conf/base.conf
index 69a51d1438..8079d0997e 100644
--- a/conf/base.conf
+++ b/conf/base.conf
@@ -304,7 +304,7 @@ i18n {
   net.domain = ${net.domain}
 }
 detectlanguage.api {
-  url = "http://ws.detectlanguage.com/0.2/detect"
+  url = "https://ws.detectlanguage.com/0.2/detect"
   key = ""
 }
 mailgun {