Use another facade

app/Http/Middleware/Authenticate.php

@@ -30,7 +30,7 @@ use FireflyIII\User;
 use Illuminate\Auth\AuthenticationException;
 use Illuminate\Contracts\Auth\Factory as Auth;
 use Illuminate\Http\Request;
-use Log;
+use Illuminate\Support\Facades\Log;
 
 /**
  * Class Authenticate

app/Http/Middleware/Installer.php

@@ -30,7 +30,7 @@ use FireflyIII\Exceptions\FireflyException;
 use FireflyIII\Support\System\OAuthKeys;
 use Illuminate\Database\QueryException;
 use Illuminate\Http\Request;
-use Log;
+use Illuminate\Support\Facades\Log;
 
 /**
  * Class Installer

app/Http/Middleware/IsDemoUser.php

@@ -27,7 +27,7 @@ use Closure;
 use FireflyIII\Repositories\User\UserRepositoryInterface;
 use FireflyIII\User;
 use Illuminate\Http\Request;
-use Log;
+use Illuminate\Support\Facades\Log;
 
 /**
  * Class IsDemoUser.

app/Http/Middleware/Range.php

@@ -29,7 +29,7 @@ use Closure;
 use FireflyIII\Repositories\Journal\JournalRepositoryInterface;
 use FireflyIII\Support\Http\Controllers\RequestInformation;
 use Illuminate\Http\Request;
-use Log;
+use Illuminate\Support\Facades\Log;
 
 /**
  * Class SessionFilter.