diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 2227a119..aa5d701f 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -23,16 +23,9 @@ jobs:
         uses: actions/setup-node@v2
         with:
           node-version: '14'
-      - name: "⚙️ npm"
-        working-directory: "./scripts"
-        run: |
-          npm install
       - name: "🔎 Run validator"
-        working-directory: "./scripts"
         run: |
-          node validator.js -s "../data/api/application-service"
-          node validator.js -s "../data/api/client-server"
-          node validator.js -s "../data/api/push-gateway"
+          npx @redocly/cli@latest lint data/api/*/*.yaml
 
   check-examples:
     name: "🔎 Check Event schema examples"
diff --git a/changelogs/internal/newsfragments/1558.clarification b/changelogs/internal/newsfragments/1558.clarification
new file mode 100644
index 00000000..29e1c1d0
--- /dev/null
+++ b/changelogs/internal/newsfragments/1558.clarification
@@ -0,0 +1 @@
+Use Redocly CLI to validate OpenAPI definitions.
diff --git a/redocly.yaml b/redocly.yaml
new file mode 100644
index 00000000..263f0bca
--- /dev/null
+++ b/redocly.yaml
@@ -0,0 +1,10 @@
+# See https://redocly.com/docs/cli/configuration/ for more information.
+extends:
+  - minimal
+rules:
+  info-license: off
+  security-defined: off
+  operation-4xx-response: off
+  no-invalid-media-type-examples: off
+  no-path-trailing-slash: off
+  operation-2xx-response: off
\ No newline at end of file
diff --git a/scripts/package-lock.json b/scripts/package-lock.json
deleted file mode 100644
index 6b6e5328..00000000
--- a/scripts/package-lock.json
+++ /dev/null
@@ -1,325 +0,0 @@
-{
-  "name": "swagger-cli-validator",
-  "version": "0.0.1",
-  "lockfileVersion": 2,
-  "requires": true,
-  "packages": {
-    "": {
-      "name": "swagger-cli-validator",
-      "version": "0.0.1",
-      "license": "ISC",
-      "dependencies": {
-        "@apidevtools/swagger-parser": "^10.1.0",
-        "nopt": "^3.0.2"
-      }
-    },
-    "node_modules/@apidevtools/json-schema-ref-parser": {
-      "version": "9.0.6",
-      "resolved": "https://registry.npmjs.org/@apidevtools/json-schema-ref-parser/-/json-schema-ref-parser-9.0.6.tgz",
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-      "dependencies": {
-        "@jsdevtools/ono": "^7.1.3",
-        "call-me-maybe": "^1.0.1",
-        "js-yaml": "^3.13.1"
-      }
-    },
-    "node_modules/@apidevtools/openapi-schemas": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/@apidevtools/openapi-schemas/-/openapi-schemas-2.1.0.tgz",
-      "integrity": "sha512-Zc1AlqrJlX3SlpupFGpiLi2EbteyP7fXmUOGup6/DnkRgjP9bgMM/ag+n91rsv0U1Gpz0H3VILA/o3bW7Ua6BQ==",
-      "engines": {
-        "node": ">=10"
-      }
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-    "node_modules/@apidevtools/swagger-methods": {
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-      "resolved": "https://registry.npmjs.org/@apidevtools/swagger-methods/-/swagger-methods-3.0.2.tgz",
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-    },
-    "node_modules/@apidevtools/swagger-parser": {
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diff --git a/scripts/package.json b/scripts/package.json
deleted file mode 100644
index 011a6e10..00000000
--- a/scripts/package.json
+++ /dev/null
@@ -1,15 +0,0 @@
-{
-  "name": "swagger-cli-validator",
-  "version": "0.0.1",
-  "description": "",
-  "main": "validator.js",
-  "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1"
-  },
-  "author": "",
-  "license": "ISC",
-  "dependencies": {
-    "@apidevtools/swagger-parser": "^10.1.0",
-    "nopt": "^3.0.2"
-  }
-}
diff --git a/scripts/validator.js b/scripts/validator.js
deleted file mode 100644
index f3b86158..00000000
--- a/scripts/validator.js
+++ /dev/null
@@ -1,86 +0,0 @@
-"use strict";
-var fs = require("fs");
-var nopt = require("nopt");
-var parser = require("@apidevtools/swagger-parser");
-var path = require("path");
-
-var opts = nopt({
-    "help": Boolean,
-    "schema": path
-}, {
-    "h": "--help",
-    "s": "--schema"
-});
-
-if (opts.help) {
-    console.log(
-        "Use swagger-parser to validate against OpenAPI 3.1.0\n" +
-        "Usage:\n" +
-        "  node validator.js -s <schema_file_or_folder>"
-    );
-    process.exit(0);
-}
-if (!opts.schema) {
-    console.error("No [s]chema specified.");
-    process.exit(1);
-}
-
-
-var errFn = function (err, api) {
-    if (!err) {
-        return;
-    }
-    console.error(err);
-    process.exit(1);
-};
-
-/**
- * @brief Produce a handler for parser.validate().
- * Recommended usage: `parser.validate(filename, makeHandler(filename));`
- * or `parser.validate(schema, makeHandler());`.
- * @param scope - usually a filename, this will be used to denote
- *                an (in)valid schema in console output; "Schema" if undefined
- * @returns {function} the handler that can be passed to parser.validate
- */
-function makeHandler(scope) {
-    if (!scope)
-        scope = "Schema";
-    return function (err, api, metadata) {
-        if (err) {
-            console.error("%s is not valid.", scope || "Schema");
-            errFn(err, api, metadata); // Won't return
-        }
-
-        Object.keys(api.paths).forEach(function (endpoint) {
-            var operationsMap = api.paths[endpoint];
-            Object.keys(operationsMap).forEach(function (verb) {
-                if (!operationsMap[verb]["operationId"]) {
-                    console.error("%s is not valid", scope);
-                    errFn("operationId is missing in " + endpoint + ", verb " + verb, api);
-                }
-            })
-        });
-
-        console.log("%s is valid.", scope);
-    }
-}
-
-var isDir = fs.lstatSync(opts.schema).isDirectory();
-if (isDir) {
-    console.log("Checking directory %s for .yaml files...", opts.schema);
-    fs.readdir(opts.schema, function (err, files) {
-        if (err) {
-            errFn(err); // Won't return
-        }
-        files.forEach(function (f) {
-            var suffix = ".yaml";
-            if (f.indexOf(suffix, f.length - suffix.length) > 0) {
-                parser.validate(path.join(opts.schema, f), makeHandler(f));
-            }
-        });
-    });
-}
-else {
-    parser.validate(opts.schema, makeHandler(opts.schema));
-}
-