diff --git a/changelog.txt b/changelog.txt
index b198d4f..6454486 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -1,4 +1,9 @@
 ---------------------------------------------------------------------------------------------------
+Version: 0.6.13
+Date: 2021-05-23
+  Features:
+    - Zombies compatibility
+---------------------------------------------------------------------------------------------------
 Version: 0.6.12
 Date: 2021-05-22
   Features:
diff --git a/info.json b/info.json
index 05ff9c3..442b3fd 100644
--- a/info.json
+++ b/info.json
@@ -1,6 +1,6 @@
 {
     "name": "bzsilicon",
-    "version": "0.6.12",
+    "version": "0.6.13",
     "factorio_version": "1.1",
     "title": "Silica & Silicon",
     "author": "Brevven",
diff --git a/recipe-updates.lua b/recipe-updates.lua
index 48fdc68..3fd2647 100644
--- a/recipe-updates.lua
+++ b/recipe-updates.lua
@@ -157,6 +157,13 @@ if mods["space-exploration"] then
   util.add_ingredient("se-material-testing-pack", "silica", 1)
 end
 
+if mods["zombiesextended-core"] then
+  if util.more_intermediates() then 
+    util.add_ingredient("complex-processing-unit", "silicon-wafer", 1)
+  else
+    util.add_ingredient("complex-processing-unit", "silicon", 2)
+  end
+end
 
 
 if mods["extended-research-system"] and mods["Bio_Industries"] then