diff --git a/packages/create-plugin/templates/modern/package.json b/packages/create-plugin/templates/modern/package.json
index 28ec824f3d..5dd9bda055 100644
--- a/packages/create-plugin/templates/modern/package.json
+++ b/packages/create-plugin/templates/modern/package.json
@@ -21,7 +21,7 @@
     "@cybozu/eslint-config": "24.3.0",
     "@kintone/dts-gen": "9.0.6",
     "@kintone/webpack-plugin-kintone-plugin": "9.0.3",
-    "ajv": "8.17.1",
+    "ajv": "8.20.0",
     "babel-loader": "9.2.1",
     "cross-env": "10.1.0",
     "eslint": "9.38.0",
diff --git a/packages/plugin-packer/package.json b/packages/plugin-packer/package.json
index 021bdb2812..7ab33e6c33 100644
--- a/packages/plugin-packer/package.json
+++ b/packages/plugin-packer/package.json
@@ -73,7 +73,7 @@
     "@types/stream-buffers": "3.0.8",
     "@types/yauzl": "2.10.3",
     "@types/yazl": "2.4.6",
-    "ajv": "8.18.0",
+    "ajv": "8.20.0",
     "array-flatten": "3.0.0",
     "assert": "2.1.0",
     "babel-plugin-replace-ts-export-assignment": "0.0.2",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index e90085eac7..5c32e9adb8 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -324,8 +324,8 @@ importers:
         specifier: 2.4.6
         version: 2.4.6
       ajv:
-        specifier: 8.18.0
-        version: 8.18.0
+        specifier: 8.20.0
+        version: 8.20.0
       array-flatten:
         specifier: 3.0.0
         version: 3.0.0
@@ -3217,6 +3217,9 @@ packages:
   ajv@8.18.0:
     resolution: {integrity: sha512-PlXPeEWMXMZ7sPYOHqmDyCJzcfNrUr3fGNKtezX14ykXOEIvyK81d+qydx89KY5O71FKMPaQ2vBfBFI5NHR63A==}
 
+  ajv@8.20.0:
+    resolution: {integrity: sha512-Thbli+OlOj+iMPYFBVBfJ3OmCAnaSyNn4M1vz9T6Gka5Jt9ba/HIR56joy65tY6kx/FCF5VXNB819Y7/GUrBGA==}
+
   alien-signals@0.4.14:
     resolution: {integrity: sha512-itUAVzhczTmP2U5yX67xVpsbbOiquusbWVyA9N+sy6+r6YVbFkahXvNCeEPWEOMhwDYwbVbGHFkVL03N9I5g+Q==}
 
@@ -10253,17 +10256,17 @@ snapshots:
     optionalDependencies:
       ajv: 8.18.0
 
-  ajv-formats@2.1.1(ajv@8.18.0):
+  ajv-formats@2.1.1(ajv@8.20.0):
     optionalDependencies:
-      ajv: 8.18.0
+      ajv: 8.20.0
 
   ajv-formats@3.0.1(ajv@8.18.0):
     optionalDependencies:
       ajv: 8.18.0
 
-  ajv-keywords@5.1.0(ajv@8.18.0):
+  ajv-keywords@5.1.0(ajv@8.20.0):
     dependencies:
-      ajv: 8.18.0
+      ajv: 8.20.0
       fast-deep-equal: 3.1.3
 
   ajv@6.14.0:
@@ -10280,6 +10283,13 @@ snapshots:
       json-schema-traverse: 1.0.0
       require-from-string: 2.0.2
 
+  ajv@8.20.0:
+    dependencies:
+      fast-deep-equal: 3.1.3
+      fast-uri: 3.1.0
+      json-schema-traverse: 1.0.0
+      require-from-string: 2.0.2
+
   alien-signals@0.4.14: {}
 
   ansi-colors@4.1.3: {}
@@ -13845,9 +13855,9 @@ snapshots:
   schema-utils@4.3.3:
     dependencies:
       '@types/json-schema': 7.0.15
-      ajv: 8.18.0
-      ajv-formats: 2.1.1(ajv@8.18.0)
-      ajv-keywords: 5.1.0(ajv@8.18.0)
+      ajv: 8.20.0
+      ajv-formats: 2.1.1(ajv@8.20.0)
+      ajv-keywords: 5.1.0(ajv@8.20.0)
 
   select-hose@2.0.0: {}