diff --git a/package-lock.json b/package-lock.json
index 60a4c17..3c0be57 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,6 +9,7 @@
       "version": "0.0.0-development",
       "license": "Apache-2.0",
       "dependencies": {
+        "@json-schema-tools/validator": "^1.4.0",
         "@open-rpc/schema-utils-js": "^1.14.0",
         "@types/isomorphic-fetch": "0.0.35",
         "@types/lodash": "^4.14.162",
@@ -1534,9 +1535,18 @@
       }
     },
     "node_modules/@json-schema-tools/traverse": {
-      "version": "1.7.7",
-      "resolved": "https://registry.npmjs.org/@json-schema-tools/traverse/-/traverse-1.7.7.tgz",
-      "integrity": "sha512-ch/pPoOEIeKe1PKbfuLEIM8MAdTiR+fr9BYk6VTlIHrya5f5d8shJg6h/oQgD3K/ftjU/RYBGGalw9Pz4pCXew=="
+      "version": "1.10.3",
+      "resolved": "https://registry.npmjs.org/@json-schema-tools/traverse/-/traverse-1.10.3.tgz",
+      "integrity": "sha512-1F8m574UObc3HuJoGGdmiOe2Ft9ObVypEKoniREs5v2G03wF/nb3YRTYFjKmI0z4S5NkdJwPFRwo7MjTjkI7Qg=="
+    },
+    "node_modules/@json-schema-tools/validator": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/@json-schema-tools/validator/-/validator-1.4.0.tgz",
+      "integrity": "sha512-0t/dBRszJEznq96EBabltiogsWxY/O2ECa9oM85a2By6q2uARJeztymdM9gmPFi0AhxlpOIi/byZcR+4zSvIMw==",
+      "dependencies": {
+        "@json-schema-tools/traverse": "^1.10.0",
+        "jsonpath": "^1.1.1"
+      }
     },
     "node_modules/@open-rpc/meta-schema": {
       "version": "1.14.0",
@@ -2663,8 +2673,7 @@
     "node_modules/deep-is": {
       "version": "0.1.3",
       "resolved": "https://registry.npmjs.org/deep-is/-/deep-is-0.1.3.tgz",
-      "integrity": "sha1-s2nW+128E+7PUk+RsHD+7cNXzzQ=",
-      "dev": true
+      "integrity": "sha1-s2nW+128E+7PUk+RsHD+7cNXzzQ="
     },
     "node_modules/deepmerge": {
       "version": "4.2.2",
@@ -2826,7 +2835,6 @@
       "version": "1.14.1",
       "resolved": "https://registry.npmjs.org/escodegen/-/escodegen-1.14.1.tgz",
       "integrity": "sha512-Bmt7NcRySdIfNPfU2ZoXDrrXsG9ZjvDxcAlMfDUgRBjLOWTuIACXPBFJH7Z+cLb40JeQco5toikyc9t9P8E9SQ==",
-      "dev": true,
       "dependencies": {
         "esprima": "^4.0.1",
         "estraverse": "^4.2.0",
@@ -2860,7 +2868,6 @@
       "version": "4.3.0",
       "resolved": "https://registry.npmjs.org/estraverse/-/estraverse-4.3.0.tgz",
       "integrity": "sha512-39nnKffWz8xN1BU/2c79n9nB9HDzo0niYUqx6xyqUnyoAnQyyWpOTdZEeiCch8BBu515t4wp9ZmgVfVhn9EBpw==",
-      "dev": true,
       "engines": {
         "node": ">=4.0"
       }
@@ -2869,7 +2876,6 @@
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/esutils/-/esutils-2.0.2.tgz",
       "integrity": "sha1-Cr9PHKpbyx96nYrMbepPqqBLrJs=",
-      "dev": true,
       "engines": {
         "node": ">=0.10.0"
       }
@@ -3200,8 +3206,7 @@
     "node_modules/fast-levenshtein": {
       "version": "2.0.6",
       "resolved": "https://registry.npmjs.org/fast-levenshtein/-/fast-levenshtein-2.0.6.tgz",
-      "integrity": "sha1-PYpcZog6FqMMqGQ+hR8Zuqd5eRc=",
-      "dev": true
+      "integrity": "sha1-PYpcZog6FqMMqGQ+hR8Zuqd5eRc="
     },
     "node_modules/fast-safe-stringify": {
       "version": "2.0.7",
@@ -6809,6 +6814,16 @@
         "graceful-fs": "^4.1.6"
       }
     },
+    "node_modules/jsonpath": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/jsonpath/-/jsonpath-1.1.1.tgz",
+      "integrity": "sha512-l6Cg7jRpixfbgoWgkrl77dgEj8RPvND0wMH6TwQmi9Qs4TFfS9u5cUFnbeKTwj5ga5Y3BTGGNI28k117LJ009w==",
+      "dependencies": {
+        "esprima": "1.2.2",
+        "static-eval": "2.0.2",
+        "underscore": "1.12.1"
+      }
+    },
     "node_modules/jsonpath-plus": {
       "version": "5.1.0",
       "resolved": "https://registry.npmjs.org/jsonpath-plus/-/jsonpath-plus-5.1.0.tgz",
@@ -6817,6 +6832,18 @@
         "node": ">=10.0.0"
       }
     },
+    "node_modules/jsonpath/node_modules/esprima": {
+      "version": "1.2.2",
+      "resolved": "https://registry.npmjs.org/esprima/-/esprima-1.2.2.tgz",
+      "integrity": "sha512-+JpPZam9w5DuJ3Q67SqsMGtiHKENSMRVoxvArfJZK01/BfLEObtZ6orJa/MtoGNR/rfMgp5837T41PAmTwAv/A==",
+      "bin": {
+        "esparse": "bin/esparse.js",
+        "esvalidate": "bin/esvalidate.js"
+      },
+      "engines": {
+        "node": ">=0.4.0"
+      }
+    },
     "node_modules/jsprim": {
       "version": "1.4.1",
       "resolved": "https://registry.npmjs.org/jsprim/-/jsprim-1.4.1.tgz",
@@ -6863,7 +6890,6 @@
       "version": "0.3.0",
       "resolved": "https://registry.npmjs.org/levn/-/levn-0.3.0.tgz",
       "integrity": "sha1-OwmSTt+fCDwEkP3UwLxEIeBHZO4=",
-      "dev": true,
       "dependencies": {
         "prelude-ls": "~1.1.2",
         "type-check": "~0.3.2"
@@ -7323,7 +7349,6 @@
       "version": "0.8.3",
       "resolved": "https://registry.npmjs.org/optionator/-/optionator-0.8.3.tgz",
       "integrity": "sha512-+IW9pACdk3XWmmTXG8m3upGUJst5XRGzxMRjXzAuJ1XnIFNvfhjjIuYkDvysnPQ7qzqVzLt78BCruntqRhWQbA==",
-      "dev": true,
       "dependencies": {
         "deep-is": "~0.1.3",
         "fast-levenshtein": "~2.0.6",
@@ -7514,7 +7539,6 @@
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/prelude-ls/-/prelude-ls-1.1.2.tgz",
       "integrity": "sha1-IZMqVJ9eUv/ZqCf1cOBL5iqX2lQ=",
-      "dev": true,
       "engines": {
         "node": ">= 0.8.0"
       }
@@ -8357,7 +8381,7 @@
       "version": "0.6.1",
       "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
       "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
-      "dev": true,
+      "devOptional": true,
       "engines": {
         "node": ">=0.10.0"
       }
@@ -8476,6 +8500,14 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/static-eval": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/static-eval/-/static-eval-2.0.2.tgz",
+      "integrity": "sha512-N/D219Hcr2bPjLxPiV+TQE++Tsmrady7TqAJugLy7Xk1EumfDWS/f5dtBbkRCGE7wKKXuYockQoj8Rm2/pVKyg==",
+      "dependencies": {
+        "escodegen": "^1.8.1"
+      }
+    },
     "node_modules/static-extend": {
       "version": "0.1.2",
       "resolved": "https://registry.npmjs.org/static-extend/-/static-extend-0.1.2.tgz",
@@ -8908,7 +8940,6 @@
       "version": "0.3.2",
       "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.3.2.tgz",
       "integrity": "sha1-WITKtRLPHTVeP7eE8wgEsrUg23I=",
-      "dev": true,
       "dependencies": {
         "prelude-ls": "~1.1.2"
       },
@@ -8956,6 +8987,11 @@
         "node": ">=4.2.0"
       }
     },
+    "node_modules/underscore": {
+      "version": "1.12.1",
+      "resolved": "https://registry.npmjs.org/underscore/-/underscore-1.12.1.tgz",
+      "integrity": "sha512-hEQt0+ZLDVUMhebKxL4x1BTtDY7bavVofhZ9KZ4aI26X9SRaE+Y3m83XUL1UP2jn8ynjndwCCpEHdUG+9pP1Tw=="
+    },
     "node_modules/union-value": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/union-value/-/union-value-1.0.1.tgz",
@@ -9200,7 +9236,6 @@
       "version": "1.2.3",
       "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.3.tgz",
       "integrity": "sha512-Hz/mrNwitNRh/HUAtM/VT/5VH+ygD6DV7mYKZAtHOrbs8U7lvPS6xf7EJKMF0uW1KJCl0H701g3ZGus+muE5vQ==",
-      "dev": true,
       "engines": {
         "node": ">=0.10.0"
       }
diff --git a/package.json b/package.json
index 8e7a030..9aff28d 100644
--- a/package.json
+++ b/package.json
@@ -18,6 +18,7 @@
   "author": "",
   "license": "Apache-2.0",
   "dependencies": {
+    "@json-schema-tools/validator": "^1.4.0",
     "@open-rpc/schema-utils-js": "^1.14.0",
     "@types/isomorphic-fetch": "0.0.35",
     "@types/lodash": "^4.14.162",
diff --git a/src/coverage.ts b/src/coverage.ts
index bfbd510..30c5538 100644
--- a/src/coverage.ts
+++ b/src/coverage.ts
@@ -8,7 +8,7 @@ import {
   MethodObjectParams
 } from "@open-rpc/meta-schema";
 const jsf = require("json-schema-faker"); // tslint:disable-line
-import Ajv from "ajv";
+import validate from "@json-schema-tools/validator";
 import { isEqual } from "lodash";
 
 const getFakeParams = (params: any[]): any[] => {
@@ -94,12 +94,12 @@ export default async (options: IOptions) => {
       if (exampleCall.expectedResult) {
         exampleCall.valid = isEqual(exampleCall.expectedResult, exampleCall.result);
       } else {
-        const ajv = new Ajv();
-        ajv.validate(exampleCall.resultSchema, exampleCall.result);
-        if (ajv.errors && ajv.errors.length > 0) {
+        const errors = validate(exampleCall.resultSchema, exampleCall.result);
+        console.log('errors', exampleCall, errors);
+        if (Array.isArray(errors) && errors.length > 0) {
           exampleCall.valid = false;
-          exampleCall.reason = JSON.stringify(ajv.errors);
-        } else {
+          exampleCall.reason = JSON.stringify(errors);
+        } else if (errors === true) {
           exampleCall.valid = true;
         }
       }
diff --git a/src/reporters/console.ts b/src/reporters/console.ts
index ffd2a2c..7f2fca4 100644
--- a/src/reporters/console.ts
+++ b/src/reporters/console.ts
@@ -3,7 +3,7 @@ import {
   OpenrpcDocument,
   JSONSchemaObject,
 } from "@open-rpc/meta-schema";
-import {ExampleCall} from "../coverage";
+import type { ExampleCall } from "../coverage";
 import _ from "lodash";
 
 const getExpectedString = (ex: ExampleCall) => {