diff --git a/package-lock.json b/package-lock.json
index 28bc2a32e8..99e06d2c53 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1044,6 +1044,12 @@
         "safer-buffer": "^2.1.0"
       }
     },
+    "emoji-regex": {
+      "version": "7.0.3",
+      "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-7.0.3.tgz",
+      "integrity": "sha512-CwBLREIQ7LvYFB0WyRvwhq5N5qPhc6PMjD6bYggFlI5YyDgl+0vxq5VHbMOFqLg7hfWzmu8T5Z1QofhmTIhItA==",
+      "dev": true
+    },
     "end-of-stream": {
       "version": "1.4.4",
       "resolved": "https://registry.npmjs.org/end-of-stream/-/end-of-stream-1.4.4.tgz",
@@ -1650,9 +1656,9 @@
       "dev": true
     },
     "glob": {
-      "version": "7.1.4",
-      "resolved": "https://registry.npmjs.org/glob/-/glob-7.1.4.tgz",
-      "integrity": "sha512-hkLPepehmnKk41pUGm3sYxoFs/umurYfYJCerbXEyFIWcAzvpipAgVkBqqT9RBKMGjnq6kMuyYwha6csxbiM1A==",
+      "version": "7.1.5",
+      "resolved": "https://registry.npmjs.org/glob/-/glob-7.1.5.tgz",
+      "integrity": "sha512-J9dlskqUXK1OeTOYBEn5s8aMukWMwWfs+rPTn/jn50Ux4MNXVhubL1wu/j2t+H4NVI+cXEcCaYellqaPVGXNqQ==",
       "dev": true,
       "requires": {
         "fs.realpath": "^1.0.0",
@@ -1682,9 +1688,9 @@
       "dev": true
     },
     "handlebars": {
-      "version": "4.4.3",
-      "resolved": "https://registry.npmjs.org/handlebars/-/handlebars-4.4.3.tgz",
-      "integrity": "sha512-B0W4A2U1ww3q7VVthTKfh+epHx+q4mCt6iK+zEAzbMBpWQAwxCeKxEGpj/1oQTpzPXDNSOG7hmG14TsISH50yw==",
+      "version": "4.4.5",
+      "resolved": "https://registry.npmjs.org/handlebars/-/handlebars-4.4.5.tgz",
+      "integrity": "sha512-0Ce31oWVB7YidkaTq33ZxEbN+UDxMMgThvCe8ptgQViymL5DPis9uLdTA13MiRPhgvqyxIegugrP97iK3JeBHg==",
       "dev": true,
       "requires": {
         "neo-async": "^2.6.0",
@@ -2632,9 +2638,9 @@
       }
     },
     "node-abi": {
-      "version": "2.11.0",
-      "resolved": "https://registry.npmjs.org/node-abi/-/node-abi-2.11.0.tgz",
-      "integrity": "sha512-kuy/aEg75u40v378WRllQ4ZexaXJiCvB68D2scDXclp/I4cRq6togpbOoKhmN07tns9Zldu51NNERo0wehfX9g==",
+      "version": "2.12.0",
+      "resolved": "https://registry.npmjs.org/node-abi/-/node-abi-2.12.0.tgz",
+      "integrity": "sha512-VhPBXCIcvmo/5K8HPmnWJyyhvgKxnHTUMXR/XwGHV68+wrgkzST4UmQrY/XszSWA5dtnXpNp528zkcyJ/pzVcw==",
       "dev": true,
       "requires": {
         "semver": "^5.4.1"
@@ -3587,11 +3593,89 @@
             "object-assign": "^4.1.0"
           }
         },
+        "load-json-file": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/load-json-file/-/load-json-file-2.0.0.tgz",
+          "integrity": "sha1-eUfkIUmvgNaWy/eXvKq8/h/inKg=",
+          "dev": true,
+          "requires": {
+            "graceful-fs": "^4.1.2",
+            "parse-json": "^2.2.0",
+            "pify": "^2.0.0",
+            "strip-bom": "^3.0.0"
+          }
+        },
+        "parse-json": {
+          "version": "2.2.0",
+          "resolved": "https://registry.npmjs.org/parse-json/-/parse-json-2.2.0.tgz",
+          "integrity": "sha1-9ID0BDTvgHQfhGkJn43qGPVaTck=",
+          "dev": true,
+          "requires": {
+            "error-ex": "^1.2.0"
+          }
+        },
+        "path-type": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/path-type/-/path-type-2.0.0.tgz",
+          "integrity": "sha1-8BLMuEFbcJb8LaoQVMPXI4lZTHM=",
+          "dev": true,
+          "requires": {
+            "pify": "^2.0.0"
+          }
+        },
+        "pify": {
+          "version": "2.3.0",
+          "resolved": "https://registry.npmjs.org/pify/-/pify-2.3.0.tgz",
+          "integrity": "sha1-7RQaasBDqEnqWISY59yosVMw6Qw=",
+          "dev": true
+        },
+        "read-pkg": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/read-pkg/-/read-pkg-2.0.0.tgz",
+          "integrity": "sha1-jvHAYjxqbbDcZxPEv6xGMysjaPg=",
+          "dev": true,
+          "requires": {
+            "load-json-file": "^2.0.0",
+            "normalize-package-data": "^2.3.2",
+            "path-type": "^2.0.0"
+          }
+        },
+        "read-pkg-up": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/read-pkg-up/-/read-pkg-up-2.0.0.tgz",
+          "integrity": "sha1-a3KoBImE4MQeeVEP1en6mbO1Sb4=",
+          "dev": true,
+          "requires": {
+            "find-up": "^2.0.0",
+            "read-pkg": "^2.0.0"
+          }
+        },
         "supports-color": {
           "version": "2.0.0",
           "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-2.0.0.tgz",
           "integrity": "sha1-U10EXOa2Nj+kARcIRimZXp3zJMc=",
           "dev": true
+        },
+        "yargs": {
+          "version": "8.0.2",
+          "resolved": "https://registry.npmjs.org/yargs/-/yargs-8.0.2.tgz",
+          "integrity": "sha1-YpmpBVsc78lp/355wdkY3Osiw2A=",
+          "dev": true,
+          "requires": {
+            "camelcase": "^4.1.0",
+            "cliui": "^3.2.0",
+            "decamelize": "^1.1.1",
+            "get-caller-file": "^1.0.1",
+            "os-locale": "^2.0.0",
+            "read-pkg-up": "^2.0.0",
+            "require-directory": "^2.1.1",
+            "require-main-filename": "^1.0.1",
+            "set-blocking": "^2.0.0",
+            "string-width": "^2.0.0",
+            "which-module": "^2.0.0",
+            "y18n": "^3.2.1",
+            "yargs-parser": "^7.0.0"
+          }
         }
       }
     },
@@ -3837,23 +3921,16 @@
       "dev": true
     },
     "uglify-js": {
-      "version": "3.6.1",
-      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.6.1.tgz",
-      "integrity": "sha512-+dSJLJpXBb6oMHP+Yvw8hUgElz4gLTh82XuX68QiJVTXaE5ibl6buzhNkQdYhBlIhozWOC9ge16wyRmjG4TwVQ==",
+      "version": "3.6.4",
+      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.6.4.tgz",
+      "integrity": "sha512-9Yc2i881pF4BPGhjteCXQNaXx1DCwm3dtOyBaG2hitHjLWOczw/ki8vD1bqyT3u6K0Ms/FpCShkmfg+FtlOfYA==",
       "dev": true,
       "optional": true,
       "requires": {
-        "commander": "2.20.0",
+        "commander": "~2.20.3",
         "source-map": "~0.6.1"
       },
       "dependencies": {
-        "commander": {
-          "version": "2.20.0",
-          "resolved": "https://registry.npmjs.org/commander/-/commander-2.20.0.tgz",
-          "integrity": "sha512-7j2y+40w61zy6YC2iRNpUe/NwhNyoXrYpHMrSunaMG64nRnaf96zO/KMQR4OyN/UnE5KLyEBnKHd4aG3rskjpQ==",
-          "dev": true,
-          "optional": true
-        },
         "source-map": {
           "version": "0.6.1",
           "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
@@ -4033,81 +4110,147 @@
       "dev": true
     },
     "yargs": {
-      "version": "8.0.2",
-      "resolved": "https://registry.npmjs.org/yargs/-/yargs-8.0.2.tgz",
-      "integrity": "sha1-YpmpBVsc78lp/355wdkY3Osiw2A=",
+      "version": "14.2.0",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-14.2.0.tgz",
+      "integrity": "sha512-/is78VKbKs70bVZH7w4YaZea6xcJWOAwkhbR0CFuZBmYtfTYF0xjGJF43AYd8g2Uii1yJwmS5GR2vBmrc32sbg==",
       "dev": true,
       "requires": {
-        "camelcase": "^4.1.0",
-        "cliui": "^3.2.0",
-        "decamelize": "^1.1.1",
-        "get-caller-file": "^1.0.1",
-        "os-locale": "^2.0.0",
-        "read-pkg-up": "^2.0.0",
+        "cliui": "^5.0.0",
+        "decamelize": "^1.2.0",
+        "find-up": "^3.0.0",
+        "get-caller-file": "^2.0.1",
         "require-directory": "^2.1.1",
-        "require-main-filename": "^1.0.1",
+        "require-main-filename": "^2.0.0",
         "set-blocking": "^2.0.0",
-        "string-width": "^2.0.0",
+        "string-width": "^3.0.0",
         "which-module": "^2.0.0",
-        "y18n": "^3.2.1",
-        "yargs-parser": "^7.0.0"
+        "y18n": "^4.0.0",
+        "yargs-parser": "^15.0.0"
       },
       "dependencies": {
-        "load-json-file": {
-          "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/load-json-file/-/load-json-file-2.0.0.tgz",
-          "integrity": "sha1-eUfkIUmvgNaWy/eXvKq8/h/inKg=",
+        "ansi-regex": {
+          "version": "4.1.0",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
+          "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
+          "dev": true
+        },
+        "camelcase": {
+          "version": "5.3.1",
+          "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-5.3.1.tgz",
+          "integrity": "sha512-L28STB170nwWS63UjtlEOE3dldQApaJXZkOI1uMFfzf3rRuPegHaHesyee+YxQ+W6SvRDQV6UrdOdRiR153wJg==",
+          "dev": true
+        },
+        "cliui": {
+          "version": "5.0.0",
+          "resolved": "https://registry.npmjs.org/cliui/-/cliui-5.0.0.tgz",
+          "integrity": "sha512-PYeGSEmmHM6zvoef2w8TPzlrnNpXIjTipYK780YswmIP9vjxmd6Y2a3CB2Ks6/AU8NHjZugXvo8w3oWM2qnwXA==",
           "dev": true,
           "requires": {
-            "graceful-fs": "^4.1.2",
-            "parse-json": "^2.2.0",
-            "pify": "^2.0.0",
-            "strip-bom": "^3.0.0"
+            "string-width": "^3.1.0",
+            "strip-ansi": "^5.2.0",
+            "wrap-ansi": "^5.1.0"
           }
         },
-        "parse-json": {
-          "version": "2.2.0",
-          "resolved": "https://registry.npmjs.org/parse-json/-/parse-json-2.2.0.tgz",
-          "integrity": "sha1-9ID0BDTvgHQfhGkJn43qGPVaTck=",
+        "find-up": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/find-up/-/find-up-3.0.0.tgz",
+          "integrity": "sha512-1yD6RmLI1XBfxugvORwlck6f75tYL+iR0jqwsOrOxMZyGYqUuDhJ0l4AXdO1iX/FTs9cBAMEk1gWSEx1kSbylg==",
           "dev": true,
           "requires": {
-            "error-ex": "^1.2.0"
+            "locate-path": "^3.0.0"
           }
         },
-        "path-type": {
-          "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/path-type/-/path-type-2.0.0.tgz",
-          "integrity": "sha1-8BLMuEFbcJb8LaoQVMPXI4lZTHM=",
+        "get-caller-file": {
+          "version": "2.0.5",
+          "resolved": "https://registry.npmjs.org/get-caller-file/-/get-caller-file-2.0.5.tgz",
+          "integrity": "sha512-DyFP3BM/3YHTQOCUL/w0OZHR0lpKeGrxotcHWcqNEdnltqFwXVfhEBQ94eIo34AfQpo0rGki4cyIiftY06h2Fg==",
+          "dev": true
+        },
+        "locate-path": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-3.0.0.tgz",
+          "integrity": "sha512-7AO748wWnIhNqAuaty2ZWHkQHRSNfPVIsPIfwEOWO22AmaoVrWavlOcMR5nzTLNYvp36X220/maaRsrec1G65A==",
           "dev": true,
           "requires": {
-            "pify": "^2.0.0"
+            "p-locate": "^3.0.0",
+            "path-exists": "^3.0.0"
           }
         },
-        "pify": {
-          "version": "2.3.0",
-          "resolved": "https://registry.npmjs.org/pify/-/pify-2.3.0.tgz",
-          "integrity": "sha1-7RQaasBDqEnqWISY59yosVMw6Qw=",
+        "p-limit": {
+          "version": "2.2.1",
+          "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-2.2.1.tgz",
+          "integrity": "sha512-85Tk+90UCVWvbDavCLKPOLC9vvY8OwEX/RtKF+/1OADJMVlFfEHOiMTPVyxg7mk/dKa+ipdHm0OUkTvCpMTuwg==",
+          "dev": true,
+          "requires": {
+            "p-try": "^2.0.0"
+          }
+        },
+        "p-locate": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/p-locate/-/p-locate-3.0.0.tgz",
+          "integrity": "sha512-x+12w/To+4GFfgJhBEpiDcLozRJGegY+Ei7/z0tSLkMmxGZNybVMSfWj9aJn8Z5Fc7dBUNJOOVgPv2H7IwulSQ==",
+          "dev": true,
+          "requires": {
+            "p-limit": "^2.0.0"
+          }
+        },
+        "p-try": {
+          "version": "2.2.0",
+          "resolved": "https://registry.npmjs.org/p-try/-/p-try-2.2.0.tgz",
+          "integrity": "sha512-R4nPAVTAU0B9D35/Gk3uJf/7XYbQcyohSKdvAxIRSNghFl4e71hVoGnBNQz9cWaXxO2I10KTC+3jMdvvoKw6dQ==",
           "dev": true
         },
-        "read-pkg": {
+        "require-main-filename": {
           "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/read-pkg/-/read-pkg-2.0.0.tgz",
-          "integrity": "sha1-jvHAYjxqbbDcZxPEv6xGMysjaPg=",
+          "resolved": "https://registry.npmjs.org/require-main-filename/-/require-main-filename-2.0.0.tgz",
+          "integrity": "sha512-NKN5kMDylKuldxYLSUfrbo5Tuzh4hd+2E8NPPX02mZtn1VuREQToYe/ZdlJy+J3uCpfaiGF05e7B8W0iXbQHmg==",
+          "dev": true
+        },
+        "string-width": {
+          "version": "3.1.0",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
+          "integrity": "sha512-vafcv6KjVZKSgz06oM/H6GDBrAtz8vdhQakGjFIvNrHA6y3HCF1CInLy+QLq8dTJPQ1b+KDUqDFctkdRW44e1w==",
           "dev": true,
           "requires": {
-            "load-json-file": "^2.0.0",
-            "normalize-package-data": "^2.3.2",
-            "path-type": "^2.0.0"
+            "emoji-regex": "^7.0.1",
+            "is-fullwidth-code-point": "^2.0.0",
+            "strip-ansi": "^5.1.0"
           }
         },
-        "read-pkg-up": {
-          "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/read-pkg-up/-/read-pkg-up-2.0.0.tgz",
-          "integrity": "sha1-a3KoBImE4MQeeVEP1en6mbO1Sb4=",
+        "strip-ansi": {
+          "version": "5.2.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
+          "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
           "dev": true,
           "requires": {
-            "find-up": "^2.0.0",
-            "read-pkg": "^2.0.0"
+            "ansi-regex": "^4.1.0"
+          }
+        },
+        "wrap-ansi": {
+          "version": "5.1.0",
+          "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-5.1.0.tgz",
+          "integrity": "sha512-QC1/iN/2/RPVJ5jYK8BGttj5z83LmSKmvbvrXPNCLZSEb32KKVDJDl/MOt2N01qU2H/FkzEa9PKto1BqDjtd7Q==",
+          "dev": true,
+          "requires": {
+            "ansi-styles": "^3.2.0",
+            "string-width": "^3.0.0",
+            "strip-ansi": "^5.0.0"
+          }
+        },
+        "y18n": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz",
+          "integrity": "sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w==",
+          "dev": true
+        },
+        "yargs-parser": {
+          "version": "15.0.0",
+          "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-15.0.0.tgz",
+          "integrity": "sha512-xLTUnCMc4JhxrPEPUYD5IBR1mWCK/aT6+RJ/K29JY2y1vD+FhtgKK0AXRWvI262q3QSffAQuTouFIKUuHX89wQ==",
+          "dev": true,
+          "requires": {
+            "camelcase": "^5.0.0",
+            "decamelize": "^1.2.0"
           }
         }
       }
diff --git a/package.json b/package.json
index 9e1b5f97c9..c0461829f6 100644
--- a/package.json
+++ b/package.json
@@ -50,6 +50,7 @@
     "sinon-chai": "^3.2.0",
     "snappy": "^6.1.2",
     "standard-version": "^4.4.0",
+    "yargs": "^14.2.0",
     "worker-farm": "^1.5.0",
     "wtfnode": "^0.8.0"
   },
diff --git a/test/tools/sdam_viz b/test/tools/sdam_viz
index ff751ea697..248a4269b6 100755
--- a/test/tools/sdam_viz
+++ b/test/tools/sdam_viz
@@ -4,19 +4,31 @@
 const { MongoClient } = require('../..');
 const arrayStrictEqual = require('../../lib/core/utils').arrayStrictEqual;
 const chalk = require('chalk');
+const argv = require('yargs')
+  .usage('Usage: $0 [options] <connection string>')
+  .demandCommand(1)
+  .help('h')
+  .describe('legacy', 'Use the legacy topology types')
+  .alias('l', 'legacy')
+  .alias('h', 'help').argv;
 
 function print(msg) {
   console.log(`${chalk.white(new Date().toISOString())} ${msg}`);
 }
 
-const uri = process.argv[2];
+const uri = argv._[0];
 const client = new MongoClient(uri, {
   useNewUrlParser: true,
-  useUnifiedTopology: true
+  useUnifiedTopology: !argv.legacy
 });
 
 async function run() {
-  print(`connecting to: ${uri}`);
+  print(
+    `connecting to: ${chalk.bold(uri)} using ${chalk.bold(
+      argv.legacy ? 'legacy' : 'unified'
+    )} topology`
+  );
+
   client.on('serverHeartbeatSucceeded', event =>
     print(
       `${chalk.yellow('heartbeat')} ${chalk.green('succeeded')} host: '${
@@ -35,11 +47,19 @@ async function run() {
 
   // server information
   client.on('serverOpening', event => {
-    print(`${chalk.cyan('server')} [${event.address}] added to topology#${event.topologyId}`);
+    print(
+      `${chalk.cyan('server')} [${event.address}] ${chalk.bold('opening')} in topology#${
+        event.topologyId
+      }`
+    );
   });
 
   client.on('serverClosed', event => {
-    print(`${chalk.cyan('server')} [${event.address}] removed from topology#${event.topologyId}`);
+    print(
+      `${chalk.cyan('server')} [${event.address}] ${chalk.bold('closed')} in topology#${
+        event.topologyId
+      }`
+    );
   });
 
   client.on('serverDescriptionChanged', event => {