diff --git a/package-lock.json b/package-lock.json
index 2eca5f9..25f52fb 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -27,7 +27,7 @@
         "mocha": "^7.2.0",
         "nyc": "^15.1.0",
         "should": "11.x",
-        "typescript": "^2.6.1"
+        "typescript": "^4.2.4"
       },
       "engines": {
         "node": ">= 8.0.0"
@@ -780,9 +780,9 @@
       }
     },
     "node_modules/clone": {
-      "version": "2.1.1",
-      "resolved": "https://registry.npmjs.org/clone/-/clone-2.1.1.tgz",
-      "integrity": "sha1-0hfR6WERjjrJpLi7oyhVU79kfNs=",
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/clone/-/clone-2.1.2.tgz",
+      "integrity": "sha1-G39Ln1kfHo+DZwQBYANFoCiHQ18=",
       "engines": {
         "node": ">=0.8"
       }
@@ -4258,9 +4258,9 @@
       }
     },
     "node_modules/typescript": {
-      "version": "2.6.1",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-2.6.1.tgz",
-      "integrity": "sha1-7znN6ierrAtQAkLWcmq5DgyEZjE=",
+      "version": "4.2.4",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.2.4.tgz",
+      "integrity": "sha512-V+evlYHZnQkaz8TRBuxTA92yZBPotr5H+WhQ7bD3hZUndx5tGOa1fuCgeSjxAzM1RiN5IzvadIXTVefuuwZCRg==",
       "dev": true,
       "bin": {
         "tsc": "bin/tsc",
@@ -5222,9 +5222,9 @@
       }
     },
     "clone": {
-      "version": "2.1.1",
-      "resolved": "https://registry.npmjs.org/clone/-/clone-2.1.1.tgz",
-      "integrity": "sha1-0hfR6WERjjrJpLi7oyhVU79kfNs="
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/clone/-/clone-2.1.2.tgz",
+      "integrity": "sha1-G39Ln1kfHo+DZwQBYANFoCiHQ18="
     },
     "coffee-coverage": {
       "version": "3.0.1",
@@ -8019,9 +8019,9 @@
       }
     },
     "typescript": {
-      "version": "2.6.1",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-2.6.1.tgz",
-      "integrity": "sha1-7znN6ierrAtQAkLWcmq5DgyEZjE=",
+      "version": "4.2.4",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.2.4.tgz",
+      "integrity": "sha512-V+evlYHZnQkaz8TRBuxTA92yZBPotr5H+WhQ7bD3hZUndx5tGOa1fuCgeSjxAzM1RiN5IzvadIXTVefuuwZCRg==",
       "dev": true
     },
     "underscore.string": {