diff --git a/dist/index.js b/dist/index.js
index 1dd407f..f7c7a06 100644
Binary files a/dist/index.js and b/dist/index.js differ
diff --git a/package.json b/package.json
index 89ef23d..8decc8c 100644
--- a/package.json
+++ b/package.json
@@ -10,6 +10,7 @@
     "node-fetch": "^2.6.0",
     "expand-tilde": "^2.0.2",
     "js-yaml": "^3.13.1",
+    "ajv": "^6.12.0",
     "@actions/core": "^1.2.4",
     "@types/expand-tilde": "^2.0.0",
     "@types/node-fetch": "^2.5.7",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 3cc7d9c..2a988b1 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -4,6 +4,7 @@ dependencies:
   '@types/js-yaml': 3.12.3
   '@types/node': 13.13.5
   '@types/node-fetch': 2.5.7
+  ajv: 6.12.0
   expand-tilde: 2.0.2
   js-yaml: 3.13.1
   node-fetch: 2.6.0
@@ -212,7 +213,6 @@ packages:
       fast-json-stable-stringify: 2.1.0
       json-schema-traverse: 0.4.1
       uri-js: 4.2.2
-    dev: true
     resolution:
       integrity: sha512-D6gFiFA0RRLyUbvijN74DWAjXSFxWKaWP7mldxkVhyhAV3+SWA9HEJPHQ2c9soIeTFJqcSdFDGFgdqs1iUU2Hw==
   /ansi-regex/4.1.0:
@@ -369,11 +369,9 @@ packages:
     resolution:
       integrity: sha1-l+gBqgUt8CRU3kawK/YhZCzchQI=
   /fast-deep-equal/3.1.1:
-    dev: true
     resolution:
       integrity: sha512-8UEa58QDLauDNfpbrX55Q9jrGHThw2ZMdOky5Gl1CDtVeJDPVrG4Jxx1N8jw2gkWaff5UUuX1KJd+9zGe2B+ZA==
   /fast-json-stable-stringify/2.1.0:
-    dev: true
     resolution:
       integrity: sha512-lhd/wF+Lk98HZoTCtlVraHtfh5XYijIjalXck7saUtuanSDyLMxnHhSXEDJqHxD7msR8D0uCmqlkwjCV8xvwHw==
   /fast-traverse/0.1.6:
@@ -484,7 +482,6 @@ packages:
     resolution:
       integrity: sha512-YfbcO7jXDdyj0DGxYVSlSeQNHbD7XPWvrVWeVUujrQEoZzWJIRrCPoyk6kL6IAjAG2IolMK4T0hNUe0HOUs5Jw==
   /json-schema-traverse/0.4.1:
-    dev: true
     resolution:
       integrity: sha512-xbbCH5dCYU5T8LcEhhuh7HJ88HXuW3qsI3Y0zOZFKfZEHcpWiHU/Jxzk629Brsab/mMiHQti9wMP+845RPe3Vg==
   /json-stable-stringify/1.0.1:
@@ -607,7 +604,6 @@ packages:
     resolution:
       integrity: sha1-F0uSaHNVNP+8es5r9TpanhtcX18=
   /punycode/2.1.1:
-    dev: true
     engines:
       node: '>=6'
     resolution:
@@ -696,7 +692,6 @@ packages:
   /uri-js/4.2.2:
     dependencies:
       punycode: 2.1.1
-    dev: true
     resolution:
       integrity: sha512-KY9Frmirql91X2Qgjry0Wd4Y+YTdrdZheS8TFwvkbLWf/G5KNJDCh6pKL5OZctEW4+0Baa5idK2ZQuELRwPznQ==
   /utility-types/3.10.0:
@@ -795,6 +790,7 @@ specifiers:
   '@types/node': ^13.13.5
   '@types/node-fetch': ^2.5.7
   '@zeit/ncc': ^0.22.1
+  ajv: ^6.12.0
   expand-tilde: ^2.0.2
   js-yaml: ^3.13.1
   node-fetch: ^2.6.0
diff --git a/src/inputs/index.ts b/src/inputs/index.ts
index 44da578..6f9bdac 100644
--- a/src/inputs/index.ts
+++ b/src/inputs/index.ts
@@ -1,6 +1,9 @@
-import { getInput, InputOptions } from '@actions/core'
+import process from 'process'
+import { getInput, error, InputOptions } from '@actions/core'
 import expandTilde from 'expand-tilde'
 import { safeLoad } from 'js-yaml'
+import Ajv from 'ajv'
+import runInstallSchema from './run-install-input.schema.json'
 
 interface RunInstall {
   readonly recursive?: boolean
@@ -30,6 +33,17 @@ const parseInputPath = (name: string) => expandTilde(getInput(name, options))
 
 function parseRunInstall(name: string): RunInstall[] {
   const result: RunInstallInput = safeLoad(getInput(name, options))
+  const ajv = new Ajv({
+    allErrors: true,
+    async: false,
+  })
+  const validate = ajv.compile(runInstallSchema)
+  if (!validate(result)) {
+    for (const errorItem of validate.errors!) {
+      error(`${errorItem.dataPath}: ${errorItem.message}`)
+    }
+    return process.exit(1)
+  }
   if (!result) return []
   if (result === true) return [{ recursive: true }]
   if (Array.isArray(result)) return result
diff --git a/src/inputs/run-install-input.schema.autogen.json b/src/inputs/run-install-input.schema.autogen.json
index f9f9305..c42a1d7 100644
--- a/src/inputs/run-install-input.schema.autogen.json
+++ b/src/inputs/run-install-input.schema.autogen.json
@@ -3,7 +3,16 @@
   "instruction": {
     "compilerOptions": {
       "strict": true,
-      "esModuleInterop": true
+      "target": "ES2018",
+      "lib": [
+        "ES2018",
+        "ES2019",
+        "ES2020",
+        "ESNext"
+      ],
+      "moduleResolution": "Node",
+      "esModuleInterop": true,
+      "resolveJsonModule": true
     },
     "input": "index.ts",
     "symbol": "RunInstallInput",