diff --git a/package-lock.json b/package-lock.json
index ea32045..ae3c52c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -267,27 +267,21 @@
       }
     },
     "ajv": {
-      "version": "5.5.2",
-      "resolved": "https://registry.npmjs.org/ajv/-/ajv-5.5.2.tgz",
-      "integrity": "sha1-c7Xuyj+rZT49P5Qis0GtQiBdyWU=",
+      "version": "6.12.3",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.3.tgz",
+      "integrity": "sha512-4K0cK3L1hsqk9xIb2z9vs/XU+PGJZ9PNpJRDS9YLzmNdX6jmVPfamLvTJr0aDAusnHyCHO6MjzlkAsgtqp9teA==",
       "dev": true,
       "requires": {
-        "co": "4.6.0",
-        "fast-deep-equal": "1.1.0",
-        "fast-json-stable-stringify": "2.0.0",
-        "json-schema-traverse": "0.3.1"
+        "fast-deep-equal": "^3.1.1",
+        "fast-json-stable-stringify": "^2.0.0",
+        "json-schema-traverse": "^0.4.1",
+        "uri-js": "^4.2.2"
       },
       "dependencies": {
         "fast-deep-equal": {
-          "version": "1.1.0",
-          "resolved": "https://registry.npmjs.org/fast-deep-equal/-/fast-deep-equal-1.1.0.tgz",
-          "integrity": "sha1-wFNHeBfIa1HaqFPIHgWbcz0CNhQ=",
-          "dev": true
-        },
-        "json-schema-traverse": {
-          "version": "0.3.1",
-          "resolved": "https://registry.npmjs.org/json-schema-traverse/-/json-schema-traverse-0.3.1.tgz",
-          "integrity": "sha1-NJptRMU6Ud6JtAgFxdXlm0F9M0A=",
+          "version": "3.1.3",
+          "resolved": "https://registry.npmjs.org/fast-deep-equal/-/fast-deep-equal-3.1.3.tgz",
+          "integrity": "sha512-f3qQ9oQy9j2AhBe/H9VC91wLmKBCCU/gDOnKNAYG5hswO7BLKj09Hc5HYNz9cGI++xlpDCIgDaitVs03ATR84Q==",
           "dev": true
         }
       }
@@ -929,12 +923,6 @@
         }
       }
     },
-    "co": {
-      "version": "4.6.0",
-      "resolved": "https://registry.npmjs.org/co/-/co-4.6.0.tgz",
-      "integrity": "sha1-bqa989hTrlTMuOR7+gvz+QMfsYQ=",
-      "dev": true
-    },
     "code-point-at": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/code-point-at/-/code-point-at-1.1.0.tgz",
diff --git a/package.json b/package.json
index 9a62463..12d694e 100644
--- a/package.json
+++ b/package.json
@@ -34,7 +34,7 @@
     "npm": "5.6.x"
   },
   "devDependencies": {
-    "ajv": "^5.0.0",
+    "ajv": "^6.12.3",
     "chai": "^4.1.2",
     "chai-http": "^4.0.0",
     "cross-env": "^5.2.0",