diff --git a/package-lock.json b/package-lock.json
index b15e63e..bc48966 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@dagrejs/graphlib-dot",
-  "version": "1.0.2",
+  "version": "1.0.3-pre",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "@dagrejs/graphlib-dot",
-      "version": "1.0.2",
+      "version": "1.0.3-pre",
       "license": "MIT",
       "dependencies": {
         "@dagrejs/graphlib": "2.1.13"
@@ -334,19 +334,22 @@
       }
     },
     "node_modules/asn1.js": {
-      "version": "4.10.1",
+      "version": "5.4.1",
+      "resolved": "https://registry.npmjs.org/asn1.js/-/asn1.js-5.4.1.tgz",
+      "integrity": "sha512-+I//4cYPccV8LdmBLiX8CYvf9Sp3vQsrqu2QNXRcrbiWvcx/UdlFiqUJJzxRQxgsZmvhXhn4cSKeSmoFjVdupA==",
       "dev": true,
-      "license": "MIT",
       "dependencies": {
         "bn.js": "^4.0.0",
         "inherits": "^2.0.1",
-        "minimalistic-assert": "^1.0.0"
+        "minimalistic-assert": "^1.0.0",
+        "safer-buffer": "^2.1.0"
       }
     },
     "node_modules/asn1.js/node_modules/bn.js": {
-      "version": "4.11.9",
-      "dev": true,
-      "license": "MIT"
+      "version": "4.12.0",
+      "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.12.0.tgz",
+      "integrity": "sha512-c98Bf3tPniI+scsdk237ku1Dc3ujXQTSgyiPUDEOe7tRkhrqridvh8klBv0HCEso1OLOYcHuCv/cS6DNxKH+ZA==",
+      "dev": true
     },
     "node_modules/assert": {
       "version": "1.5.0",
@@ -430,9 +433,10 @@
       }
     },
     "node_modules/bn.js": {
-      "version": "5.1.2",
-      "dev": true,
-      "license": "MIT"
+      "version": "5.2.1",
+      "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-5.2.1.tgz",
+      "integrity": "sha512-eXRvHzWyYPBuB4NBy0cmYQjGitUrtqwbvlzP3G6VFnNRbsZQIxQ10PbKKHt8gZ/HW/D/747aDl+QkDqg3KQLMQ==",
+      "dev": true
     },
     "node_modules/body-parser": {
       "version": "1.20.2",
@@ -635,39 +639,40 @@
       }
     },
     "node_modules/browserify-rsa": {
-      "version": "4.0.1",
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/browserify-rsa/-/browserify-rsa-4.1.0.tgz",
+      "integrity": "sha512-AdEER0Hkspgno2aR97SAf6vi0y0k8NuOpGnVH3O99rcA5Q6sh8QxcngtHuJ6uXwnfAXNM4Gn1Gb7/MV1+Ymbog==",
       "dev": true,
-      "license": "MIT",
       "dependencies": {
-        "bn.js": "^4.1.0",
+        "bn.js": "^5.0.0",
         "randombytes": "^2.0.1"
       }
     },
-    "node_modules/browserify-rsa/node_modules/bn.js": {
-      "version": "4.11.9",
-      "dev": true,
-      "license": "MIT"
-    },
     "node_modules/browserify-sign": {
-      "version": "4.2.0",
+      "version": "4.2.2",
+      "resolved": "https://registry.npmjs.org/browserify-sign/-/browserify-sign-4.2.2.tgz",
+      "integrity": "sha512-1rudGyeYY42Dk6texmv7c4VcQ0EsvVbLwZkA+AQB7SxvXxmcD93jcHie8bzecJ+ChDlmAm2Qyu0+Ccg5uhZXCg==",
       "dev": true,
-      "license": "ISC",
       "dependencies": {
-        "bn.js": "^5.1.1",
-        "browserify-rsa": "^4.0.1",
+        "bn.js": "^5.2.1",
+        "browserify-rsa": "^4.1.0",
         "create-hash": "^1.2.0",
         "create-hmac": "^1.1.7",
-        "elliptic": "^6.5.2",
+        "elliptic": "^6.5.4",
         "inherits": "^2.0.4",
-        "parse-asn1": "^5.1.5",
-        "readable-stream": "^3.6.0",
-        "safe-buffer": "^5.2.0"
+        "parse-asn1": "^5.1.6",
+        "readable-stream": "^3.6.2",
+        "safe-buffer": "^5.2.1"
+      },
+      "engines": {
+        "node": ">= 4"
       }
     },
     "node_modules/browserify-sign/node_modules/readable-stream": {
-      "version": "3.6.0",
+      "version": "3.6.2",
+      "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.6.2.tgz",
+      "integrity": "sha512-9u/sniCrY3D5WdsERHzHE4G2YCXqoG5FTHUiCC4SIbr6XcLZBY05ya9EKjYek9O5xOAwjGq+1JdGBAS7Q9ScoA==",
       "dev": true,
-      "license": "MIT",
       "dependencies": {
         "inherits": "^2.0.3",
         "string_decoder": "^1.1.1",
@@ -3637,13 +3642,13 @@
       }
     },
     "node_modules/parse-asn1": {
-      "version": "5.1.5",
+      "version": "5.1.6",
+      "resolved": "https://registry.npmjs.org/parse-asn1/-/parse-asn1-5.1.6.tgz",
+      "integrity": "sha512-RnZRo1EPU6JBnra2vGHj0yhp6ebyjBZpmUCLHWiFhxlzvBCCpAuZ7elsBp1PVAbQN0/04VD/19rfzlBSwLstMw==",
       "dev": true,
-      "license": "ISC",
       "dependencies": {
-        "asn1.js": "^4.0.0",
+        "asn1.js": "^5.2.0",
         "browserify-aes": "^1.0.0",
-        "create-hash": "^1.1.0",
         "evp_bytestokey": "^1.0.0",
         "pbkdf2": "^3.0.3",
         "safe-buffer": "^5.1.1"
@@ -5186,16 +5191,21 @@
       }
     },
     "asn1.js": {
-      "version": "4.10.1",
+      "version": "5.4.1",
+      "resolved": "https://registry.npmjs.org/asn1.js/-/asn1.js-5.4.1.tgz",
+      "integrity": "sha512-+I//4cYPccV8LdmBLiX8CYvf9Sp3vQsrqu2QNXRcrbiWvcx/UdlFiqUJJzxRQxgsZmvhXhn4cSKeSmoFjVdupA==",
       "dev": true,
       "requires": {
         "bn.js": "^4.0.0",
         "inherits": "^2.0.1",
-        "minimalistic-assert": "^1.0.0"
+        "minimalistic-assert": "^1.0.0",
+        "safer-buffer": "^2.1.0"
       },
       "dependencies": {
         "bn.js": {
-          "version": "4.11.9",
+          "version": "4.12.0",
+          "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.12.0.tgz",
+          "integrity": "sha512-c98Bf3tPniI+scsdk237ku1Dc3ujXQTSgyiPUDEOe7tRkhrqridvh8klBv0HCEso1OLOYcHuCv/cS6DNxKH+ZA==",
           "dev": true
         }
       }
@@ -5256,7 +5266,9 @@
       "dev": true
     },
     "bn.js": {
-      "version": "5.1.2",
+      "version": "5.2.1",
+      "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-5.2.1.tgz",
+      "integrity": "sha512-eXRvHzWyYPBuB4NBy0cmYQjGitUrtqwbvlzP3G6VFnNRbsZQIxQ10PbKKHt8gZ/HW/D/747aDl+QkDqg3KQLMQ==",
       "dev": true
     },
     "body-parser": {
@@ -5433,36 +5445,36 @@
       }
     },
     "browserify-rsa": {
-      "version": "4.0.1",
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/browserify-rsa/-/browserify-rsa-4.1.0.tgz",
+      "integrity": "sha512-AdEER0Hkspgno2aR97SAf6vi0y0k8NuOpGnVH3O99rcA5Q6sh8QxcngtHuJ6uXwnfAXNM4Gn1Gb7/MV1+Ymbog==",
       "dev": true,
       "requires": {
-        "bn.js": "^4.1.0",
+        "bn.js": "^5.0.0",
         "randombytes": "^2.0.1"
-      },
-      "dependencies": {
-        "bn.js": {
-          "version": "4.11.9",
-          "dev": true
-        }
       }
     },
     "browserify-sign": {
-      "version": "4.2.0",
+      "version": "4.2.2",
+      "resolved": "https://registry.npmjs.org/browserify-sign/-/browserify-sign-4.2.2.tgz",
+      "integrity": "sha512-1rudGyeYY42Dk6texmv7c4VcQ0EsvVbLwZkA+AQB7SxvXxmcD93jcHie8bzecJ+ChDlmAm2Qyu0+Ccg5uhZXCg==",
       "dev": true,
       "requires": {
-        "bn.js": "^5.1.1",
-        "browserify-rsa": "^4.0.1",
+        "bn.js": "^5.2.1",
+        "browserify-rsa": "^4.1.0",
         "create-hash": "^1.2.0",
         "create-hmac": "^1.1.7",
-        "elliptic": "^6.5.2",
+        "elliptic": "^6.5.4",
         "inherits": "^2.0.4",
-        "parse-asn1": "^5.1.5",
-        "readable-stream": "^3.6.0",
-        "safe-buffer": "^5.2.0"
+        "parse-asn1": "^5.1.6",
+        "readable-stream": "^3.6.2",
+        "safe-buffer": "^5.2.1"
       },
       "dependencies": {
         "readable-stream": {
-          "version": "3.6.0",
+          "version": "3.6.2",
+          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.6.2.tgz",
+          "integrity": "sha512-9u/sniCrY3D5WdsERHzHE4G2YCXqoG5FTHUiCC4SIbr6XcLZBY05ya9EKjYek9O5xOAwjGq+1JdGBAS7Q9ScoA==",
           "dev": true,
           "requires": {
             "inherits": "^2.0.3",
@@ -7589,12 +7601,13 @@
       }
     },
     "parse-asn1": {
-      "version": "5.1.5",
+      "version": "5.1.6",
+      "resolved": "https://registry.npmjs.org/parse-asn1/-/parse-asn1-5.1.6.tgz",
+      "integrity": "sha512-RnZRo1EPU6JBnra2vGHj0yhp6ebyjBZpmUCLHWiFhxlzvBCCpAuZ7elsBp1PVAbQN0/04VD/19rfzlBSwLstMw==",
       "dev": true,
       "requires": {
-        "asn1.js": "^4.0.0",
+        "asn1.js": "^5.2.0",
         "browserify-aes": "^1.0.0",
-        "create-hash": "^1.1.0",
         "evp_bytestokey": "^1.0.0",
         "pbkdf2": "^3.0.3",
         "safe-buffer": "^5.1.1"