diff --git a/configuration.org b/configuration.org
index 90f72ff..782723a 100644
--- a/configuration.org
+++ b/configuration.org
@@ -3174,13 +3174,6 @@ The new completing system!
   :mode "\\.po\\'")
 #+END_SRC
 
-** C#
-
-#+BEGIN_SRC emacs-lisp
-(use-package csharp-mode
-  :mode "\\.cs\\'")
-#+END_SRC
-
 ** PlantUML
 
 Before using this, make sure the latest PlantUML JAR file is downloaded into the downloads