diff --git a/CHANGELOG.md b/CHANGELOG.md
index 79cd0c0..259a436 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,5 @@
-- v3.0.5
-  + 移除了物品`齿轮`，调整了相关配方
+- v3.0.6
+  + 移除了黑雾掉落中的`齿轮`
   + 调整了部分科技的研究需求、前置科技
 
   + Removed item `Gears` and adjusted related recipes
@@ -10,6 +10,14 @@
   <summary>点击展开日志 | Click to view all </summary>
 
 
+- v3.0.5
+  + 移除了物品`齿轮`，调整了相关配方
+  + 调整了部分科技的研究需求、前置科技
+
+  + Removed item `Gears` and adjusted related recipes
+  + Adjusted research requirements and pre-requisite technologies for some technologies.
+
+
 - v3.0.4
   + 调整了配方`齿轮`、`电磁矩阵`、`基础机械组件`、`煤炭干馏`的需求；`合成氨`、`硫酸`的速度
   + 调整了矿物生成时的分布
diff --git a/data/items_mod.json b/data/items_mod.json
index a2c7357..982ccbf 100644
--- a/data/items_mod.json
+++ b/data/items_mod.json
@@ -185,8 +185,8 @@
     "DropRate": 0.0,
     "EnemyDropLevel": 1,
     "EnemyDropRange": [
-      0.959,
-      0.005
+      0.1,
+      0.007
     ],
     "EnemyDropCount": 1.4,
     "EnemyDropMask": 2147483647,
diff --git a/data/items_vanilla.json b/data/items_vanilla.json
index 52fe8a9..f7b76cf 100644
--- a/data/items_vanilla.json
+++ b/data/items_vanilla.json
@@ -2566,13 +2566,13 @@
     "BombType": 0,
     "CraftType": 0,
     "DropRate": 0,
-    "EnemyDropLevel": 1,
+    "EnemyDropLevel": 0,
     "EnemyDropRange": [
-      0.1,
-      0.007
+      0.0,
+      0.0
     ],
-    "EnemyDropCount": 1.7,
-    "EnemyDropMask": 2147483647,
+    "EnemyDropCount": 0,
+    "EnemyDropMask": 0,
     "EnemyDropMaskRatio": 0
   },
   {
diff --git a/data/techs.json b/data/techs.json
index 5316815..9e0d440 100644
--- a/data/techs.json
+++ b/data/techs.json
@@ -487,9 +487,7 @@
     "PreTechs": [
       1900
     ],
-    "PreTechsImplicit": [
-      1002
-    ],
+    "PreTechsImplicit": [],
     "Items": [
       6203
     ],
@@ -535,7 +533,9 @@
     "PreTechs": [
       1120
     ],
-    "PreTechsImplicit": [],
+    "PreTechsImplicit": [
+      1932
+    ],
     "Items": [
       6001
     ],
@@ -579,9 +579,11 @@
     ],
     "PreTechsImplicit": [],
     "Items": [
-      6278
+      6001,
+      6002
     ],
     "ItemPoints": [
+      20,
       20
     ],
     "HashNeeded": 72000,
@@ -1475,9 +1477,11 @@
       1122
     ],
     "Items": [
-      6278
+      6001,
+      6002
     ],
     "ItemPoints": [
+      20,
       20
     ],
     "HashNeeded": 144000,
@@ -2622,11 +2626,9 @@
     ],
     "PreTechsImplicit": [],
     "Items": [
-      6001,
-      6002
+      6278
     ],
     "ItemPoints": [
-      5,
       5
     ],
     "HashNeeded": 288000,
@@ -4297,7 +4299,8 @@
       1801
     ],
     "PreTechsImplicit": [
-      1101
+      1101,
+      1805
     ],
     "Items": [
       6001
@@ -4348,11 +4351,9 @@
       1502
     ],
     "Items": [
-      6001,
-      6002
+      6278
     ],
     "ItemPoints": [
-      10,
       10
     ],
     "HashNeeded": 144000,
@@ -5545,7 +5546,8 @@
       1941
     ],
     "PreTechsImplicit": [
-      1120
+      1120,
+      1002
     ],
     "Items": [
       6001
diff --git a/src/Patches/Logic/ModelLoadingPatches.cs b/src/Patches/Logic/ModelLoadingPatches.cs
index 91c8005..5597526 100644
--- a/src/Patches/Logic/ModelLoadingPatches.cs
+++ b/src/Patches/Logic/ModelLoadingPatches.cs
@@ -12,8 +12,8 @@ public static class ModelLoadingPatches
     {
         private static readonly Func<short, short> ModelIdMigrationAction = modelIndex =>
         {
-            // if (modelIndex > 500 && modelIndex < 520) modelIndex += 300;
-            // v3.0 don't need merge old modelIds
+            if (modelIndex > 500 && modelIndex < 520) modelIndex += 300;
+
             return modelIndex;
         };
 
@@ -82,7 +82,7 @@ public static IEnumerable<CodeInstruction> SkillSystem_Constructor_Transpiler(IE
 
             return matcher.InstructionEnumeration();
         }
-        
+
         [HarmonyPatch(typeof(ModelProto), nameof(ModelProto.InitMaxModelIndex))]
         [HarmonyPostfix]
         public static void InitMaxModelIndex()
diff --git a/src/ProjectGenesis.cs b/src/ProjectGenesis.cs
index ed1242f..64aa41a 100644
--- a/src/ProjectGenesis.cs
+++ b/src/ProjectGenesis.cs
@@ -54,7 +54,7 @@ public class ProjectGenesis : BaseUnityPlugin, IModCanSave, IMultiplayerMod
     {
         public const string MODGUID = "org.LoShin.GenesisBook";
         public const string MODNAME = "GenesisBook";
-        public const string VERSION = "3.0.5";
+        public const string VERSION = "3.0.6";
         public const string DEBUGVERSION = "";
 
         public static bool LoadCompleted;