diff --git a/config/dev.exs b/config/dev.exs
index eaa1eff7d..660e6dd58 100644
--- a/config/dev.exs
+++ b/config/dev.exs
@@ -9,6 +9,7 @@ config :mobilizon, Mobilizon.Web.Endpoint,
     port: String.to_integer(System.get_env("MOBILIZON_INSTANCE_HOST_PORT", "80")),
     scheme: "http"
   ],
+  secret_key_base: System.get_env("MOBILIZON_INSTANCE_SECRET_KEY_BASE", "changethis"),
   debug_errors: true,
   code_reloader: true,
   check_origin: false,
@@ -84,6 +85,9 @@ config :mobilizon, :instance,
   registrations_open: System.get_env("MOBILIZON_INSTANCE_REGISTRATIONS_OPEN") == "true",
   groups: true
 
+config :mobilizon, Mobilizon.Web.Auth.Guardian,
+  secret_key: System.get_env("MOBILIZON_INSTANCE_SECRET_KEY", "changethis")
+
 # config :mobilizon, :activitypub, sign_object_fetches: false
 
 config :mobilizon, Mobilizon.Web.Upload.Uploader.Local, uploads: "uploads"