diff --git a/app/controllers/df/core/thumb_controller.rb b/app/controllers/df/core/thumb_controller.rb
index 9767054..36097d4 100644
--- a/app/controllers/df/core/thumb_controller.rb
+++ b/app/controllers/df/core/thumb_controller.rb
@@ -2,7 +2,10 @@
 module ::Df::Core
 	class ThumbController < ::ApplicationController
 		layout false
-		skip_before_filter :preload_json, :check_xhr
+		# 2018-01-10
+		# "`skip_before_filter` is deprecated, I need to replace it with `skip_before_action`":
+		# https://github.com/discourse-pro/df-core/issues/4
+		skip_before_action :preload_json, :check_xhr
 		def index
 			original = params[:original]
 			upload = Upload.find_by(sha1: original) || Upload.find_by(url: original)
diff --git a/plugin.rb b/plugin.rb
index 9bb5598..77f0265 100644
--- a/plugin.rb
+++ b/plugin.rb
@@ -1,6 +1,6 @@
 # name: df-core
 # about: A common functionality of my Discourse plugins.
-# version: 1.2.5
+# version: 1.2.6
 # authors: Dmitry Fedyuk
 # url: https://discourse.pro
 #register_asset 'javascripts/lib/sprintf.js'