diff --git a/specification/0.0/schema/vrm.firstperson.meshannotation.schema.json b/specification/0.0/schema/vrm.firstperson.meshannotation.schema.json
index 719672c2b1..b2ce8fe783 100644
--- a/specification/0.0/schema/vrm.firstperson.meshannotation.schema.json
+++ b/specification/0.0/schema/vrm.firstperson.meshannotation.schema.json
@@ -3,8 +3,7 @@
     "type": "object",
     "properties": {
         "mesh": {
-            "type": "integer",
-            "minimum": 0
+            "type": "integer"
         },
         "firstPersonFlag": {
             "type": "string"
diff --git a/specification/0.0/schema/vrm.firstperson.schema.json b/specification/0.0/schema/vrm.firstperson.schema.json
index 3bc965dc4e..ec8a488b47 100644
--- a/specification/0.0/schema/vrm.firstperson.schema.json
+++ b/specification/0.0/schema/vrm.firstperson.schema.json
@@ -4,8 +4,7 @@
     "properties": {
         "firstPersonBone": {
             "description": "The bone whose rendering should be turned off in first-person view. Usually Head is specified.",
-            "type": "integer",
-            "minimum": 0
+            "type": "integer"
         },
         "firstPersonBoneOffset": {
             "description": "The target position of the VR headset in first-person view. It is assumed that an offset from the head bone to the VR headset is added.",
diff --git a/specification/0.0/schema/vrm.humanoid.bone.schema.json b/specification/0.0/schema/vrm.humanoid.bone.schema.json
index b60dd4a15e..cd6c4b1373 100644
--- a/specification/0.0/schema/vrm.humanoid.bone.schema.json
+++ b/specification/0.0/schema/vrm.humanoid.bone.schema.json
@@ -9,8 +9,7 @@
         },
         "node": {
             "description": "Reference node index",
-            "type": "integer",
-            "minimum": 0
+            "type": "integer"
         },
         "useDefaultValues": {
             "description": "Unity's HumanLimit.useDefaultValues",
diff --git a/specification/0.0/schema/vrm.meta.schema.json b/specification/0.0/schema/vrm.meta.schema.json
index 1c94c7dfee..64c6e34371 100644
--- a/specification/0.0/schema/vrm.meta.schema.json
+++ b/specification/0.0/schema/vrm.meta.schema.json
@@ -24,8 +24,7 @@
         },
         "texture": {
             "description": "Thumbnail of VRM model",
-            "type": "integer",
-            "minimum": 0
+            "type": "integer"
         },
         "allowedUserName": {
             "description": "A person who can perform with this avatar",
diff --git a/specification/0.0/schema/vrm.schema.json b/specification/0.0/schema/vrm.schema.json
index c3238d9c85..de4769123f 100644
--- a/specification/0.0/schema/vrm.schema.json
+++ b/specification/0.0/schema/vrm.schema.json
@@ -4,7 +4,7 @@
     "type": "object",
     "properties": {
         "exporterVersion": {
-            "description": "Version of exporter that vrm created. UniVRM-0.53.0",
+            "description": "Version of exporter that vrm created. UniVRM-0.46",
             "type": "string"
         },
         "specVersion": {
diff --git a/specification/0.0/schema/vrm.secondaryanimation.collidergroup.schema.json b/specification/0.0/schema/vrm.secondaryanimation.collidergroup.schema.json
index c0663452d3..75721b03f6 100644
--- a/specification/0.0/schema/vrm.secondaryanimation.collidergroup.schema.json
+++ b/specification/0.0/schema/vrm.secondaryanimation.collidergroup.schema.json
@@ -4,8 +4,7 @@
     "properties": {
         "node": {
             "description": "The node of the collider group for setting up collision detections.",
-            "type": "integer",
-            "minimum": 0
+            "type": "integer"
         },
         "colliders": {
             "type": "array",
diff --git a/specification/0.0/schema/vrm.secondaryanimation.spring.schema.json b/specification/0.0/schema/vrm.secondaryanimation.spring.schema.json
index 1551381c1c..bf35679d41 100644
--- a/specification/0.0/schema/vrm.secondaryanimation.spring.schema.json
+++ b/specification/0.0/schema/vrm.secondaryanimation.spring.schema.json
@@ -45,16 +45,14 @@
             "description": "Specify the node index of the root bone of the swaying object.",
             "type": "array",
             "items": {
-                "type": "integer",
-                "minimum": 0
+                "type": "integer"
             }
         },
         "colliderGroups": {
             "description": "Specify the index of the collider group for collisions with swaying objects.",
             "type": "array",
             "items": {
-                "type": "integer",
-                "minimum": 0
+                "type": "integer"
             }
         }
     }