diff --git a/bzzirconium2/changelog.txt b/bzzirconium2/changelog.txt
index 93ad198..fcddcd2 100644
--- a/bzzirconium2/changelog.txt
+++ b/bzzirconium2/changelog.txt
@@ -1,9 +1,4 @@
 ---------------------------------------------------------------------------------------------------
-Version: 2.2.2
-Date: 16.03.2026
-  Bug Fixes:
-    - Correct renamed "efficiency-module"
----------------------------------------------------------------------------------------------------
 Version: 2.2.1
 Date: 11.03.2026
   Bug Fixes:
diff --git a/bzzirconium2/info.json b/bzzirconium2/info.json
index 3ed856e..35c6694 100644
--- a/bzzirconium2/info.json
+++ b/bzzirconium2/info.json
@@ -1,6 +1,6 @@
 {
   "name": "bzzirconium2",
-  "version": "2.2.2",
+  "version": "2.2.1",
   "factorio_version": "2.0",
   "title": "Zirconium - Legacy",
   "description": "Adds zircon, zirconia, zirconium, and more to the base game.",
diff --git a/bzzirconium2/tech-updates.lua b/bzzirconium2/tech-updates.lua
index 0dfefca..3144f52 100644
--- a/bzzirconium2/tech-updates.lua
+++ b/bzzirconium2/tech-updates.lua
@@ -21,7 +21,7 @@ if util.me.use_cermet() then
   end
   util.add_prerequisite("productivity-module-3", "cermet")
   util.add_prerequisite("speed-module-3", "cermet")
-  util.add_prerequisite("efficiency-module-3", "cermet")
+  util.add_prerequisite("effectivity-module-3", "cermet")
 
   -- utility science techs behind cermet
   util.add_prerequisite("rocket-control-unit", "cermet")
diff --git a/bzzirconium2/zirconium-recipe-updates.lua b/bzzirconium2/zirconium-recipe-updates.lua
index fe3543a..314873a 100644
--- a/bzzirconium2/zirconium-recipe-updates.lua
+++ b/bzzirconium2/zirconium-recipe-updates.lua
@@ -246,7 +246,7 @@ if util.me.use_cermet() then
   if mods["modules-t4"] then
     util.add_ingredient("speed-module-4", "cermet", 6)
     util.add_ingredient("productivity-module-4", "cermet", 6)
-    util.add_ingredient("efficiency-module-4", "cermet", 6)
+    util.add_ingredient("effectivity-module-4", "cermet", 6)
   end
 
   -- Various assemblers