diff --git a/.travis.yml b/.travis.yml
index 351b4b2..d4b864d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -17,14 +17,6 @@ script:
 
 matrix:
   include:
-  - name: "Linux (Legacy Node)"
-    os: linux
-    dist: bionic
-    # See https://docs.travis-ci.com/user/gui-and-headless-browsers/#using-services
-    services:
-      - xvfb
-    node_js:
-      - 8
   - name: "Linux (Latest Node)"
     os: linux
     dist: bionic
@@ -32,11 +24,11 @@ matrix:
     services:
       - xvfb
     node_js:
-      - node
+      - 10
   - name: "OS X (Latest Node)"
     os: osx
     node_js:
-      - node
+      - 10
     before_script:
       # See https://github.com/GoogleChromeLabs/selenium-assistant/issues/118
       - "sudo /usr/bin/safaridriver --enable"
diff --git a/package-lock.json b/package-lock.json
index 8d5bce6..d5012e1 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -5,116 +5,157 @@
   "requires": true,
   "dependencies": {
     "@babel/code-frame": {
-      "version": "7.5.5",
-      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.5.5.tgz",
-      "integrity": "sha512-27d4lZoomVyo51VegxI20xZPuSHusqbQag/ztrBC7wegWoQ1nLREPVSKSW8byhTlzTKyNE4ifaTA6lCp7JjpFw==",
+      "version": "7.8.3",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.8.3.tgz",
+      "integrity": "sha512-a9gxpmdXtZEInkCSHUJDLHZVBgb1QS0jhss4cPP93EW7s+uC5bikET2twEF3KV+7rDblJcmNvTR7VJejqd2C2g==",
       "dev": true,
       "requires": {
-        "@babel/highlight": "^7.0.0"
+        "@babel/highlight": "^7.8.3"
       }
     },
+    "@babel/helper-validator-identifier": {
+      "version": "7.9.5",
+      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.9.5.tgz",
+      "integrity": "sha512-/8arLKUFq882w4tWGj9JYzRpAlZgiWUJ+dtteNTDqrRBz9Iguck9Rn3ykuBDoUwh2TO4tSAJlrxDUOXWklJe4g==",
+      "dev": true
+    },
     "@babel/highlight": {
-      "version": "7.5.0",
-      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.5.0.tgz",
-      "integrity": "sha512-7dV4eu9gBxoM0dAnj/BCFDW9LFU0zvTrkq0ugM7pnHEgguOEeOz1so2ZghEdzviYzQEED0r4EAgpsBChKy1TRQ==",
+      "version": "7.9.0",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.9.0.tgz",
+      "integrity": "sha512-lJZPilxX7Op3Nv/2cvFdnlepPXDxi29wxteT57Q965oc5R9v86ztx0jfxVrTcBk8C2kcPkkDa2Z4T3ZsPPVWsQ==",
       "dev": true,
       "requires": {
+        "@babel/helper-validator-identifier": "^7.9.0",
         "chalk": "^2.0.0",
-        "esutils": "^2.0.2",
         "js-tokens": "^4.0.0"
       }
     },
     "@babel/parser": {
-      "version": "7.5.5",
-      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.5.5.tgz",
-      "integrity": "sha512-E5BN68cqR7dhKan1SfqgPGhQ178bkVKpXTPEXnFJBrEt8/DKRZlybmy+IgYLTeN7tp1R5Ccmbm2rBk17sHYU3g==",
+      "version": "7.9.4",
+      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.9.4.tgz",
+      "integrity": "sha512-bC49otXX6N0/VYhgOMh4gnP26E9xnDZK3TmbNpxYzzz9BQLBosQwfyOe9/cXUU3txYhTzLCbcqd5c8y/OmCjHA==",
       "dev": true
     },
     "@firebase/app": {
-      "version": "0.4.12",
-      "resolved": "https://registry.npmjs.org/@firebase/app/-/app-0.4.12.tgz",
-      "integrity": "sha512-7FtKrp1t37FmYUyX+wa0LriujGdkhjdSqr3UKdy2A8I+C90NU0EskrUsPg9wiMtCs40esy265zhyxVFu08xhxw==",
+      "version": "0.4.17",
+      "resolved": "https://registry.npmjs.org/@firebase/app/-/app-0.4.17.tgz",
+      "integrity": "sha512-YkCe10/KHnfJ5Lx79SCQ4ZJRlpnwe8Yns6Ntf7kltXq1hCQCUrKEU3zaOTPY90SBx36hYm47IaqkKwT/kBOK3A==",
       "dev": true,
       "requires": {
-        "@firebase/app-types": "0.4.2",
-        "@firebase/logger": "0.1.20",
-        "@firebase/util": "0.2.23",
+        "@firebase/app-types": "0.4.3",
+        "@firebase/logger": "0.1.25",
+        "@firebase/util": "0.2.28",
         "dom-storage": "2.1.0",
         "tslib": "1.10.0",
         "xmlhttprequest": "1.8.0"
+      },
+      "dependencies": {
+        "tslib": {
+          "version": "1.10.0",
+          "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.10.0.tgz",
+          "integrity": "sha512-qOebF53frne81cf0S9B41ByenJ3/IuH8yJKngAX35CmiZySA0khhkovshKK+jGCaMnVomla7gVlIcc3EvKPbTQ==",
+          "dev": true
+        }
       }
     },
     "@firebase/app-types": {
-      "version": "0.4.2",
-      "resolved": "https://registry.npmjs.org/@firebase/app-types/-/app-types-0.4.2.tgz",
-      "integrity": "sha512-d+hH4+WugO4EQiDzTIAbZq1N7X0RkrvO7nhD9/BEBUssrOnKlUOOqozvc3kNYaGnk4Ziv0cmO+J+Eu2Kc0/qaw==",
+      "version": "0.4.3",
+      "resolved": "https://registry.npmjs.org/@firebase/app-types/-/app-types-0.4.3.tgz",
+      "integrity": "sha512-VU5c+ZjejvefLVH4cjiX3Hy1w9HYMv7TtZ1tF9ZmOqT4DSIU1a3VISWoo8///cGGffr5IirMO+Q/WZLI4p8VcA==",
       "dev": true
     },
     "@firebase/auth": {
-      "version": "0.11.6",
-      "resolved": "https://registry.npmjs.org/@firebase/auth/-/auth-0.11.6.tgz",
-      "integrity": "sha512-Vz1Mi613tIt5Fr/P4fvQ+ArVSekxljDBmhRO3/+ESoXRxW/l8RuR1YX4nStTSUH3jYBoy92KOCLLWb2Btee9Xw==",
+      "version": "0.12.0",
+      "resolved": "https://registry.npmjs.org/@firebase/auth/-/auth-0.12.0.tgz",
+      "integrity": "sha512-DGYvAmz2aUmrWYS3ADw/UmsuicxJi6G+X38XITqNPUrd1YxmM5SBzX19oEb9WCrJZXcr4JaESg6hQkT2yEPaCA==",
       "dev": true,
       "requires": {
-        "@firebase/auth-types": "0.7.2"
+        "@firebase/auth-types": "0.8.0"
       }
     },
     "@firebase/auth-types": {
-      "version": "0.7.2",
-      "resolved": "https://registry.npmjs.org/@firebase/auth-types/-/auth-types-0.7.2.tgz",
-      "integrity": "sha512-xm3evp6671LoI+6M8Om3OhikabLf88Ivz1e7aR8uZjVBYptEYbF3seDIyHn/3wWdVYbp20WK4aWixKlRnHl+6Q==",
+      "version": "0.8.0",
+      "resolved": "https://registry.npmjs.org/@firebase/auth-types/-/auth-types-0.8.0.tgz",
+      "integrity": "sha512-foQHhvyB0RR+mb/+wmHXd/VOU+D8fruFEW1k79Q9wzyTPpovMBa1Mcns5fwEWBhUfi8bmoEtaGB8RSAHnTFzTg==",
       "dev": true
     },
     "@firebase/database": {
-      "version": "0.4.10",
-      "resolved": "https://registry.npmjs.org/@firebase/database/-/database-0.4.10.tgz",
-      "integrity": "sha512-cn5kg0nx6v4vapAs0HZl683w5fLbRZO8sKkhARwgMaLMBnTWnMQT2rXX2UyhNGBASNA8PLBk8y5P8du0tJHLWw==",
+      "version": "0.5.4",
+      "resolved": "https://registry.npmjs.org/@firebase/database/-/database-0.5.4.tgz",
+      "integrity": "sha512-Hz1Bi3fzIcNNocE4EhvvwoEQGurG2BGssWD3/6a2bzty+K1e57SLea2Ied8QYNBUU1zt/4McHfa3Y71EQIyn/w==",
       "dev": true,
       "requires": {
-        "@firebase/database-types": "0.4.2",
-        "@firebase/logger": "0.1.20",
-        "@firebase/util": "0.2.23",
+        "@firebase/database-types": "0.4.3",
+        "@firebase/logger": "0.1.25",
+        "@firebase/util": "0.2.28",
         "faye-websocket": "0.11.3",
         "tslib": "1.10.0"
+      },
+      "dependencies": {
+        "tslib": {
+          "version": "1.10.0",
+          "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.10.0.tgz",
+          "integrity": "sha512-qOebF53frne81cf0S9B41ByenJ3/IuH8yJKngAX35CmiZySA0khhkovshKK+jGCaMnVomla7gVlIcc3EvKPbTQ==",
+          "dev": true
+        }
       }
     },
     "@firebase/database-types": {
-      "version": "0.4.2",
-      "resolved": "https://registry.npmjs.org/@firebase/database-types/-/database-types-0.4.2.tgz",
-      "integrity": "sha512-rBF/Sp4S4zzVg+a6h0iEiXR2GdNRrvx2BR6IcvGHnSPF7XVpj9UuUWtZMJyO+vWP3zlIGDvlNRJ4qF01Y6KxGg==",
-      "dev": true
+      "version": "0.4.3",
+      "resolved": "https://registry.npmjs.org/@firebase/database-types/-/database-types-0.4.3.tgz",
+      "integrity": "sha512-21yCiJA2Tyt6dJYwWeB69MwoawBu5UWNtP6MAY0ugyRBHVdjAMHMYalPxCjZ46LAmhfim0+i8NXRadOFVS3hUA==",
+      "dev": true,
+      "requires": {
+        "@firebase/app-types": "0.x"
+      }
     },
     "@firebase/firestore": {
-      "version": "1.4.7",
-      "resolved": "https://registry.npmjs.org/@firebase/firestore/-/firestore-1.4.7.tgz",
-      "integrity": "sha512-iuUO639N6+UU7Y1hc6VDr+kQaocmRg8Cbgs7x1pFHM5pFGGDyIIEoJrKxaqXsTlp5lOCVIpe6xr7wEDbeJdcVA==",
+      "version": "1.5.3",
+      "resolved": "https://registry.npmjs.org/@firebase/firestore/-/firestore-1.5.3.tgz",
+      "integrity": "sha512-O/yAbXpitOA6g627cUl0/FHYlkTy1EiEKMKOlnlMOJF2fH+nLVZREXjsrCC7N2tIvTn7yYwfpZ4zpSNvrhwiTA==",
       "dev": true,
       "requires": {
-        "@firebase/firestore-types": "1.4.4",
-        "@firebase/logger": "0.1.20",
-        "@firebase/util": "0.2.23",
-        "@firebase/webchannel-wrapper": "0.2.23",
+        "@firebase/firestore-types": "1.5.0",
+        "@firebase/logger": "0.1.25",
+        "@firebase/util": "0.2.28",
+        "@firebase/webchannel-wrapper": "0.2.26",
         "@grpc/proto-loader": "^0.5.0",
-        "grpc": "1.22.2",
+        "grpc": "1.23.3",
         "tslib": "1.10.0"
+      },
+      "dependencies": {
+        "tslib": {
+          "version": "1.10.0",
+          "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.10.0.tgz",
+          "integrity": "sha512-qOebF53frne81cf0S9B41ByenJ3/IuH8yJKngAX35CmiZySA0khhkovshKK+jGCaMnVomla7gVlIcc3EvKPbTQ==",
+          "dev": true
+        }
       }
     },
     "@firebase/firestore-types": {
-      "version": "1.4.4",
-      "resolved": "https://registry.npmjs.org/@firebase/firestore-types/-/firestore-types-1.4.4.tgz",
-      "integrity": "sha512-kFpmzkUKfzrXkcMad+TQlMs55dWNY0q1UxGICW82EneX3Yg6HN3Nx36kYfqH+SLBFUN1ZTikN07alMp0MA9p9g==",
+      "version": "1.5.0",
+      "resolved": "https://registry.npmjs.org/@firebase/firestore-types/-/firestore-types-1.5.0.tgz",
+      "integrity": "sha512-VhRHNbEbak+R2iK8e1ir2Lec7eaHMZpGTRy6LMtzATYthlkwNHF9tO8JU8l6d1/kYkI4+DWzX++i3HhTziHEWA==",
       "dev": true
     },
     "@firebase/functions": {
-      "version": "0.4.13",
-      "resolved": "https://registry.npmjs.org/@firebase/functions/-/functions-0.4.13.tgz",
-      "integrity": "sha512-7Lmpt2EcRjVJ65oTJwTVWQN4E83BTSReazqRM9P4rbjR9U47g4dbtaOmIc6H9b4uhfqmG/me2YYcPtsgS6z2jA==",
+      "version": "0.4.18",
+      "resolved": "https://registry.npmjs.org/@firebase/functions/-/functions-0.4.18.tgz",
+      "integrity": "sha512-N/ijwpxJy26kOErYIi5QS8pQgMZEuEMF/zDaNmgqcoN3J8P52NhBnVQZnIl+U4W96nQfNiURhSwXEERHFyvSZQ==",
       "dev": true,
       "requires": {
         "@firebase/functions-types": "0.3.8",
         "@firebase/messaging-types": "0.3.2",
         "isomorphic-fetch": "2.2.1",
         "tslib": "1.10.0"
+      },
+      "dependencies": {
+        "tslib": {
+          "version": "1.10.0",
+          "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.10.0.tgz",
+          "integrity": "sha512-qOebF53frne81cf0S9B41ByenJ3/IuH8yJKngAX35CmiZySA0khhkovshKK+jGCaMnVomla7gVlIcc3EvKPbTQ==",
+          "dev": true
+        }
       }
     },
     "@firebase/functions-types": {
@@ -124,15 +165,23 @@
       "dev": true
     },
     "@firebase/installations": {
-      "version": "0.2.2",
-      "resolved": "https://registry.npmjs.org/@firebase/installations/-/installations-0.2.2.tgz",
-      "integrity": "sha512-jCMKNaKdt1sE8i+Q0aVUohf6pRqQ/uEQ855beggLBd75MiWzOYgljM/SFZY6oLZVhfmlQ5/kvDj8mn5NzUwawQ==",
+      "version": "0.2.7",
+      "resolved": "https://registry.npmjs.org/@firebase/installations/-/installations-0.2.7.tgz",
+      "integrity": "sha512-67tzowHVwRBtEuB1HLMD+fCdoRyinOQlMKBes7UwrtZIVd0CPDUqAKxNqup5EypWZb7O2tqFtRzK7POajfSNMA==",
       "dev": true,
       "requires": {
         "@firebase/installations-types": "0.1.2",
-        "@firebase/util": "0.2.23",
+        "@firebase/util": "0.2.28",
         "idb": "3.0.2",
         "tslib": "1.10.0"
+      },
+      "dependencies": {
+        "tslib": {
+          "version": "1.10.0",
+          "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.10.0.tgz",
+          "integrity": "sha512-qOebF53frne81cf0S9B41ByenJ3/IuH8yJKngAX35CmiZySA0khhkovshKK+jGCaMnVomla7gVlIcc3EvKPbTQ==",
+          "dev": true
+        }
       }
     },
     "@firebase/installations-types": {
@@ -142,20 +191,28 @@
       "dev": true
     },
     "@firebase/logger": {
-      "version": "0.1.20",
-      "resolved": "https://registry.npmjs.org/@firebase/logger/-/logger-0.1.20.tgz",
-      "integrity": "sha512-ahGXFhqow5RjrhwnYZNHluZt6UVdFt1iRrGzhYEJVGlkyBy0vXELn1P6ajIi8BKGQhu5sBQm8I1n6bVDlHQkUA==",
+      "version": "0.1.25",
+      "resolved": "https://registry.npmjs.org/@firebase/logger/-/logger-0.1.25.tgz",
+      "integrity": "sha512-/lRhuepVcCCnQ2jcO5Hr08SYdmZDTQU9fdPdzg+qXJ9k/QnIrD2RbswXQcL6mmae3uPpX7fFXQAoScJ9pzp50w==",
       "dev": true
     },
     "@firebase/messaging": {
-      "version": "0.4.6",
-      "resolved": "https://registry.npmjs.org/@firebase/messaging/-/messaging-0.4.6.tgz",
-      "integrity": "sha512-IUw7aFQNWQabi3HkMJ3bfxi/cwzxqVfno5KIsh7mGao/jUGYaBSLi0a4W0IftyUem3Lba0eKxHexUBe3J9q8Jw==",
+      "version": "0.4.11",
+      "resolved": "https://registry.npmjs.org/@firebase/messaging/-/messaging-0.4.11.tgz",
+      "integrity": "sha512-KYt479yio6ThkV7Pb9LRB1KPIBio+OR4RozwyoLC1ZSVQdTIrd/sVEuDSzYY88Wh/6Kg6ejdu2z6mfWG9l1ZaQ==",
       "dev": true,
       "requires": {
         "@firebase/messaging-types": "0.3.2",
-        "@firebase/util": "0.2.23",
+        "@firebase/util": "0.2.28",
         "tslib": "1.10.0"
+      },
+      "dependencies": {
+        "tslib": {
+          "version": "1.10.0",
+          "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.10.0.tgz",
+          "integrity": "sha512-qOebF53frne81cf0S9B41ByenJ3/IuH8yJKngAX35CmiZySA0khhkovshKK+jGCaMnVomla7gVlIcc3EvKPbTQ==",
+          "dev": true
+        }
       }
     },
     "@firebase/messaging-types": {
@@ -165,16 +222,24 @@
       "dev": true
     },
     "@firebase/performance": {
-      "version": "0.2.13",
-      "resolved": "https://registry.npmjs.org/@firebase/performance/-/performance-0.2.13.tgz",
-      "integrity": "sha512-5vd53amUSYRTXOHVSu+BBQ5SuS8t3z4tkpjRxm/HIo9xGATs46bcKzXF2YZvDTVRwKD6I+R0ra97rj0VlAs4Sw==",
+      "version": "0.2.19",
+      "resolved": "https://registry.npmjs.org/@firebase/performance/-/performance-0.2.19.tgz",
+      "integrity": "sha512-dINWwR/XcSiSnFNNX7QWfec8bymiXk1Zp6mPyPN+R9ONMrpDbygQUy06oT/6r/xx9nHG4Za6KMUJag3sWNKqnQ==",
       "dev": true,
       "requires": {
-        "@firebase/installations": "0.2.2",
-        "@firebase/logger": "0.1.20",
+        "@firebase/installations": "0.2.7",
+        "@firebase/logger": "0.1.25",
         "@firebase/performance-types": "0.0.3",
-        "@firebase/util": "0.2.23",
+        "@firebase/util": "0.2.28",
         "tslib": "1.10.0"
+      },
+      "dependencies": {
+        "tslib": {
+          "version": "1.10.0",
+          "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.10.0.tgz",
+          "integrity": "sha512-qOebF53frne81cf0S9B41ByenJ3/IuH8yJKngAX35CmiZySA0khhkovshKK+jGCaMnVomla7gVlIcc3EvKPbTQ==",
+          "dev": true
+        }
       }
     },
     "@firebase/performance-types": {
@@ -184,22 +249,16 @@
       "dev": true
     },
     "@firebase/polyfill": {
-      "version": "0.3.17",
-      "resolved": "https://registry.npmjs.org/@firebase/polyfill/-/polyfill-0.3.17.tgz",
-      "integrity": "sha512-YHjswXwwPjpkru/GkMD77cTxBh5ky5v8iDeNCuIfSg0eDStC7GeYGWBjXOmsyN0R2iWYROSm7ZmCGt6Fk7qqkg==",
+      "version": "0.3.22",
+      "resolved": "https://registry.npmjs.org/@firebase/polyfill/-/polyfill-0.3.22.tgz",
+      "integrity": "sha512-PYbEqDHJhJJoF2Q5IB/oP0Tz6O2vSUPtODy9kUQibi+T0bK1gkTaySPwz8GAgHfIpFNENj1kK+7Xpf87R8bYbw==",
       "dev": true,
       "requires": {
-        "core-js": "3.1.4",
+        "core-js": "3.2.1",
         "promise-polyfill": "8.1.3",
         "whatwg-fetch": "2.0.4"
       },
       "dependencies": {
-        "core-js": {
-          "version": "3.1.4",
-          "resolved": "https://registry.npmjs.org/core-js/-/core-js-3.1.4.tgz",
-          "integrity": "sha512-YNZN8lt82XIMLnLirj9MhKDFZHalwzzrL9YLt6eb0T5D0EDl4IQ90IGkua8mHbnxNrkj1d8hbdizMc0Qmg1WnQ==",
-          "dev": true
-        },
         "whatwg-fetch": {
           "version": "2.0.4",
           "resolved": "https://registry.npmjs.org/whatwg-fetch/-/whatwg-fetch-2.0.4.tgz",
@@ -209,14 +268,22 @@
       }
     },
     "@firebase/storage": {
-      "version": "0.3.7",
-      "resolved": "https://registry.npmjs.org/@firebase/storage/-/storage-0.3.7.tgz",
-      "integrity": "sha512-H89Tye67n2ZIy0iei7FWXjZ795YAcL5EbgOpYigygditI3OG+GTjkIbdgcg9PXaaY0YME5Yp3y+JsR0a2RJTuA==",
+      "version": "0.3.12",
+      "resolved": "https://registry.npmjs.org/@firebase/storage/-/storage-0.3.12.tgz",
+      "integrity": "sha512-8hXt3qPZlVH+yPF4W9Dc15/gBiTPGUJUgYs3dH9WnO41QWl1o4aNlZpZK/pdnpCIO1GmN0+PxJW9TCNb0H0Hqw==",
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+            "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": {
-          "version": "12.0.5",
-          "resolved": "https://registry.npmjs.org/yargs/-/yargs-12.0.5.tgz",
-          "integrity": "sha512-Lhz8TLaYnxq/2ObqHDql8dX8CJi97oHxrjUcYtzKbbykPtVW9WB+poxI+NM2UIzsMgNCZTIf0AQwsjK5yMAqZw==",
+          "version": "13.3.2",
+          "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.3.2.tgz",
+          "integrity": "sha512-AX3Zw5iPruN5ie6xGRIDgqkT+ZhnRlZMLMHAs8tg7nRruy2Nb+i5o9bwghAogtM08q1dpr2LVoS8KSTMYpWXUw==",
           "dev": true,
           "requires": {
-            "cliui": "^4.0.0",
-            "decamelize": "^1.2.0",
+            "cliui": "^5.0.0",
             "find-up": "^3.0.0",
-            "get-caller-file": "^1.0.1",
-            "os-locale": "^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 || ^4.0.0",
-            "yargs-parser": "^11.1.1"
-          }
-        },
-        "yargs-parser": {
-          "version": "11.1.1",
-          "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-11.1.1.tgz",
-          "integrity": "sha512-C6kB/WJDiaxONLJQnF8ccx9SEeoTTLek8RVbaOIsrAUS8VrBEXfmeSnCZxygc+XC2sNMBIwOOnfcxiynjHsVSQ==",
-          "dev": true,
-          "requires": {
-            "camelcase": "^5.0.0",
-            "decamelize": "^1.2.0"
+            "y18n": "^4.0.0",
+            "yargs-parser": "^13.1.2"
           }
         }
       }
diff --git a/package.json b/package.json
index 27f9a40..b76f802 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "selenium-assistant",
-  "version": "6.0.0",
+  "version": "6.1.0",
   "description": "A node module to help with use of selenium driver",
   "main": "src/index.js",
   "scripts": {
@@ -50,7 +50,7 @@
     "node-localstorage": "^1.3.1",
     "request": "^2.88.0",
     "sauce-connect-launcher": "^1.2.7",
-    "selenium-webdriver": "^4.0.0-alpha.4",
+    "selenium-webdriver": "^4.0.0-alpha.7",
     "semver": "^6.3.0",
     "which": "^1.3.1",
     "yauzl": "^2.10.0"
diff --git a/src/local-browsers/safari.js b/src/local-browsers/safari.js
index adc0605..276919c 100644
--- a/src/local-browsers/safari.js
+++ b/src/local-browsers/safari.js
@@ -61,9 +61,10 @@ class LocalSafariBrowser extends LocalBrowser {
         .forBrowser(this.getId())
         .setSafariOptions(seleniumOptions);
 
-    // Run safari 12+ in legacy mode until this is resolved:
+    // Run Safari 12 in legacy mode due to
     // https://github.com/SeleniumHQ/selenium/issues/6026
-    if (this.getVersionNumber() >= 12) {
+    // This is not needed in Safari 13+.
+    if (this.getVersionNumber() === 12) {
       builder = builder.usingServer(
           new safari.ServiceBuilder().addArguments('--legacy').build().start());
     }