diff --git a/patching/patches/kan-extensions-4.1.patch b/patching/patches/kan-extensions-4.1.patch
new file mode 100644
index 0000000..64d48d7
--- /dev/null
+++ b/patching/patches/kan-extensions-4.1.patch
@@ -0,0 +1,11 @@
+diff -ruN orig/kan-extensions.cabal new/kan-extensions.cabal
+--- orig/kan-extensions.cabal	2014-08-25 17:24:28.206498700 +0300
++++ new/kan-extensions.cabal	2014-08-25 17:24:28.000000000 +0300
+@@ -51,6 +51,7 @@
+     mtl           >= 2.0.1   && < 2.3,
+     pointed       >= 4       && < 5,
+     semigroupoids >= 4       && < 5,
++    tagged,
+     transformers  >= 0.2     && < 0.5
+ 
+   exposed-modules: