diff --git a/ext/data/schemas/dictionary-kanji-bank-v1-schema.json b/ext/data/schemas/dictionary-kanji-bank-v1-schema.json
index 6dad5a7a..5aca2d6a 100644
--- a/ext/data/schemas/dictionary-kanji-bank-v1-schema.json
+++ b/ext/data/schemas/dictionary-kanji-bank-v1-schema.json
@@ -2,7 +2,7 @@
     "$schema": "http://json-schema.org/draft-07/schema#",
     "type": "array",
     "description": "Data file containing kanji information.",
-    "additionalItems": {
+    "items": {
         "type": "array",
         "description": "Information about a single kanji character.",
         "minItems": 4,
diff --git a/ext/data/schemas/dictionary-kanji-bank-v3-schema.json b/ext/data/schemas/dictionary-kanji-bank-v3-schema.json
index a5b82039..ee508294 100644
--- a/ext/data/schemas/dictionary-kanji-bank-v3-schema.json
+++ b/ext/data/schemas/dictionary-kanji-bank-v3-schema.json
@@ -2,10 +2,11 @@
     "$schema": "http://json-schema.org/draft-07/schema#",
     "type": "array",
     "description": "Data file containing kanji information.",
-    "additionalItems": {
+    "items": {
         "type": "array",
         "description": "Information about a single kanji character.",
         "minItems": 6,
+        "additionalItems": false,
         "items": [
             {
                 "type": "string",
diff --git a/ext/data/schemas/dictionary-kanji-meta-bank-v3-schema.json b/ext/data/schemas/dictionary-kanji-meta-bank-v3-schema.json
index 0864c9aa..98c023ff 100644
--- a/ext/data/schemas/dictionary-kanji-meta-bank-v3-schema.json
+++ b/ext/data/schemas/dictionary-kanji-meta-bank-v3-schema.json
@@ -26,10 +26,11 @@
     },
     "type": "array",
     "description": "Custom metadata for kanji characters.",
-    "additionalItems": {
+    "items": {
         "type": "array",
         "description": "Metadata about a single kanji character.",
         "minItems": 3,
+        "additionalItems": false,
         "items": [
             {
                 "type": "string",
diff --git a/ext/data/schemas/dictionary-tag-bank-v3-schema.json b/ext/data/schemas/dictionary-tag-bank-v3-schema.json
index ee5ca64d..f7721119 100644
--- a/ext/data/schemas/dictionary-tag-bank-v3-schema.json
+++ b/ext/data/schemas/dictionary-tag-bank-v3-schema.json
@@ -2,10 +2,11 @@
     "$schema": "http://json-schema.org/draft-07/schema#",
     "type": "array",
     "description": "Data file containing tag information for terms and kanji.",
-    "additionalItems": {
+    "items": {
         "type": "array",
         "description": "Information about a single tag.",
         "minItems": 5,
+        "additionalItems": false,
         "items": [
             {
                 "type": "string",
diff --git a/ext/data/schemas/dictionary-term-bank-v1-schema.json b/ext/data/schemas/dictionary-term-bank-v1-schema.json
index 5fd8e2ba..9366e9ff 100644
--- a/ext/data/schemas/dictionary-term-bank-v1-schema.json
+++ b/ext/data/schemas/dictionary-term-bank-v1-schema.json
@@ -2,7 +2,7 @@
     "$schema": "http://json-schema.org/draft-07/schema#",
     "type": "array",
     "description": "Data file containing term information.",
-    "additionalItems": {
+    "items": {
         "type": "array",
         "description": "Information about a single term.",
         "minItems": 5,
diff --git a/ext/data/schemas/dictionary-term-bank-v3-schema.json b/ext/data/schemas/dictionary-term-bank-v3-schema.json
index 12c2e4f3..a7c861d5 100644
--- a/ext/data/schemas/dictionary-term-bank-v3-schema.json
+++ b/ext/data/schemas/dictionary-term-bank-v3-schema.json
@@ -302,10 +302,11 @@
     },
     "type": "array",
     "description": "Data file containing term information.",
-    "additionalItems": {
+    "items": {
         "type": "array",
         "description": "Information about a single term.",
         "minItems": 8,
+        "additionalItems": false,
         "items": [
             {
                 "type": "string",
diff --git a/ext/data/schemas/dictionary-term-meta-bank-v3-schema.json b/ext/data/schemas/dictionary-term-meta-bank-v3-schema.json
index 96f2e54b..a8e06d0d 100644
--- a/ext/data/schemas/dictionary-term-meta-bank-v3-schema.json
+++ b/ext/data/schemas/dictionary-term-meta-bank-v3-schema.json
@@ -26,10 +26,11 @@
     },
     "type": "array",
     "description": "Custom metadata for terms.",
-    "additionalItems": {
+    "items": {
         "type": "array",
         "description": "Metadata about a single term.",
         "minItems": 3,
+        "additionalItems": false,
         "items": [
             {
                 "type": "string",
@@ -97,7 +98,7 @@
                             "pitches": {
                                 "type": "array",
                                 "description": "List of different pitch accent information for the term and reading combination.",
-                                "additionalItems": {
+                                "items": {
                                     "type": "object",
                                     "required": [
                                         "position"