diff --git a/bzgold2/changelog.txt b/bzgold2/changelog.txt
index 3f15ad9..5d1ccff 100644
--- a/bzgold2/changelog.txt
+++ b/bzgold2/changelog.txt
@@ -1,4 +1,9 @@
 ---------------------------------------------------------------------------------------------------
+Version: 2.1.1
+Date: 16.03.2026
+  Bug Fixes:
+    - Correct renamed "efficiency-module"
+---------------------------------------------------------------------------------------------------
 Version: 2.1.0
 Date: 11.03.2026
   Changes:
diff --git a/bzgold2/info.json b/bzgold2/info.json
index 7325c93..774b5cf 100644
--- a/bzgold2/info.json
+++ b/bzgold2/info.json
@@ -1,6 +1,6 @@
 {
   "name": "bzgold2",
-  "version": "2.1.0",
+  "version": "2.1.1",
   "factorio_version": "2.0",
   "title": "Noble Metals",
   "description": "Adds silver, gold, platinum, palladium and more to the base game. Reworks processing units.",
diff --git a/bzgold2/prototypes/recipe-updates-se.lua b/bzgold2/prototypes/recipe-updates-se.lua
index 3d28799..37c9fe3 100644
--- a/bzgold2/prototypes/recipe-updates-se.lua
+++ b/bzgold2/prototypes/recipe-updates-se.lua
@@ -95,10 +95,10 @@ if util.se6() then
   --------
   --TODO rebalance SE modules more completely
 
-  util.replace_ingredient("effectivity-module-5", "se-holmium-cable", "platinum-ingot", 10)
-  util.replace_ingredient("effectivity-module-5", "se-holmium-cable", "silver-plate")
-  util.replace_ingredient("effectivity-module-5", "se-holmium-cable", "palladium-ingot", 10)
-  util.replace_ingredient("effectivity-module-5", "se-holmium-cable", "gold-ingot", 10)
+  util.replace_ingredient("efficiency-module-5", "se-holmium-cable", "platinum-ingot", 10)
+  util.replace_ingredient("efficiency-module-5", "se-holmium-cable", "silver-plate")
+  util.replace_ingredient("efficiency-module-5", "se-holmium-cable", "palladium-ingot", 10)
+  util.replace_ingredient("efficiency-module-5", "se-holmium-cable", "gold-ingot", 10)
 
   util.replace_ingredient("speed-module-5", "se-heavy-girder", "gold-ingot", 10)
   util.replace_ingredient("speed-module-5", "se-heavy-girder", "palladium-ingot", 10)
diff --git a/bzgold2/prototypes/recipe-updates.lua b/bzgold2/prototypes/recipe-updates.lua
index 93cdc66..4483e6d 100644
--- a/bzgold2/prototypes/recipe-updates.lua
+++ b/bzgold2/prototypes/recipe-updates.lua
@@ -28,10 +28,10 @@ else
 end
 
 util.add_ingredient("speed-module-3", "mlcc", 5)
-util.add_ingredient("effectivity-module-3", "mlcc", 5)
+util.add_ingredient("efficiency-module-3", "mlcc", 5)
 util.add_ingredient("productivity-module-3", "mlcc", 5)
 util.remove_ingredient("speed-module-3", "cermet")
-util.remove_ingredient("effectivity-module-3", "cermet")
+util.remove_ingredient("efficiency-module-3", "cermet")
 util.remove_ingredient("productivity-module-3", "cermet")
 
 util.add_ingredient("gas-extractor", "silver-brazing-alloy", 10)