diff --git a/behaviour/entities/1.10.0/minecraft.entity.json b/behaviour/entities/1.10.0/minecraft.entity.json
index ebf80ab4..15c2c995 100644
--- a/behaviour/entities/1.10.0/minecraft.entity.json
+++ b/behaviour/entities/1.10.0/minecraft.entity.json
@@ -3,6 +3,7 @@
   "$id": "blockception.minecraft.behaviour.entities.minecraft:entity",
   "title": "Entity 1.10.0",
   "required": ["description"],
+  "additionalProperties": false,
   "properties": {
     "description": {
       "required": ["identifier"],
diff --git a/behaviour/entities/1.11.0/minecraft.entity.json b/behaviour/entities/1.11.0/minecraft.entity.json
index ee33e2b4..a3d1edc3 100644
--- a/behaviour/entities/1.11.0/minecraft.entity.json
+++ b/behaviour/entities/1.11.0/minecraft.entity.json
@@ -3,6 +3,7 @@
   "$id": "blockception.minecraft.behaviour.entities.minecraft:entity",
   "title": "Entity 1.11.0",
   "required": ["description"],
+  "additionalProperties": false,
   "properties": {
     "description": {
       "required": ["identifier"],
diff --git a/behaviour/entities/1.12.0/minecraft.entity.json b/behaviour/entities/1.12.0/minecraft.entity.json
index d748053b..27f9e7ba 100644
--- a/behaviour/entities/1.12.0/minecraft.entity.json
+++ b/behaviour/entities/1.12.0/minecraft.entity.json
@@ -3,6 +3,7 @@
   "$id": "blockception.minecraft.behaviour.entities.minecraft:entity",
   "title": "Entity 1.12.0",
   "required": ["description"],
+  "additionalProperties": false,
   "properties": {
     "description": {
       "required": ["identifier"],
diff --git a/behaviour/entities/1.13.0/minecraft.entity.json b/behaviour/entities/1.13.0/minecraft.entity.json
index 8c05695d..4ec4244e 100644
--- a/behaviour/entities/1.13.0/minecraft.entity.json
+++ b/behaviour/entities/1.13.0/minecraft.entity.json
@@ -3,6 +3,7 @@
   "$id": "blockception.minecraft.behaviour.entities.minecraft:entity",
   "title": "Entity 1.13.0",
   "required": ["description"],
+  "additionalProperties": false,
   "properties": {
     "description": {
       "required": ["identifier"],
diff --git a/behaviour/entities/1.14.0/minecraft.entity.json b/behaviour/entities/1.14.0/minecraft.entity.json
index 9320251e..31beade2 100644
--- a/behaviour/entities/1.14.0/minecraft.entity.json
+++ b/behaviour/entities/1.14.0/minecraft.entity.json
@@ -3,6 +3,7 @@
   "$id": "blockception.minecraft.behaviour.entities.minecraft:entity",
   "title": "Entity 1.14.0",
   "required": ["description"],
+  "additionalProperties": false,
   "properties": {
     "description": {
       "required": ["identifier"],
diff --git a/behaviour/entities/1.16.0/minecraft.entity.json b/behaviour/entities/1.16.0/minecraft.entity.json
index f62514da..11b99afd 100644
--- a/behaviour/entities/1.16.0/minecraft.entity.json
+++ b/behaviour/entities/1.16.0/minecraft.entity.json
@@ -3,6 +3,7 @@
   "$id": "blockception.minecraft.behaviour.entities.minecraft:entity.1.16.0",
   "title": "Entity 1.16.0",
   "required": ["description"],
+  "additionalProperties": false,
   "dependencies": {
     "component_groups": ["events"]
   },
diff --git a/behaviour/entities/1.16.100/minecraft.entity.json b/behaviour/entities/1.16.100/minecraft.entity.json
index 02f79717..38950394 100644
--- a/behaviour/entities/1.16.100/minecraft.entity.json
+++ b/behaviour/entities/1.16.100/minecraft.entity.json
@@ -3,6 +3,7 @@
   "$id": "blockception.minecraft.behaviour.entities.minecraft:entity.1.16.100",
   "title": "Entity 1.16.100",
   "required": ["description"],
+  "additionalProperties": false,
   "dependencies": {
     "component_groups": ["events"]
   },
diff --git a/behaviour/entities/1.8.0/minecraft.entity.json b/behaviour/entities/1.8.0/minecraft.entity.json
index f432f6d9..446e6033 100644
--- a/behaviour/entities/1.8.0/minecraft.entity.json
+++ b/behaviour/entities/1.8.0/minecraft.entity.json
@@ -3,9 +3,8 @@
   "$id": "blockception.minecraft.behaviour.entities.minecraft:entity.1.8.0",
   "title": "Entity 1.8.0",
   "required": ["description"],
-  "dependencies": {
-    "component_groups": ["events"]
-  },
+  "dependencies": { "component_groups": ["events"] },
+  "additionalProperties": false,
   "properties": {
     "description": {
       "required": ["identifier"],
diff --git a/behaviour/entities/entities.json b/behaviour/entities/entities.json
index 3e635cfe..e567b458 100644
--- a/behaviour/entities/entities.json
+++ b/behaviour/entities/entities.json
@@ -1,6 +1,7 @@
 {
   "$schema": "http://json-schema.org/draft-07/schema",
   "$id": "blockception.minecraft.behaviour.entities",
+  "required": ["format_version"],
   "examples": [
     {
       "format_version": "1.16.0",