diff --git a/commands/functions-log.js b/commands/functions-log.js
index 6250ed94..7849fe6f 100644
--- a/commands/functions-log.js
+++ b/commands/functions-log.js
@@ -9,7 +9,7 @@ var getProjectId = require("../lib/getProjectId");
 var logger = require("../lib/logger");
 var requireAccess = require("../lib/requireAccess");
 var scopes = require("../lib/scopes");
-var open = require("open");
+var open = require("opn");
 
 module.exports = new Command("functions:log")
   .description("read logs from deployed functions")
diff --git a/commands/open.js b/commands/open.js
index be7fcd17..25c30380 100644
--- a/commands/open.js
+++ b/commands/open.js
@@ -2,7 +2,7 @@
 
 var _ = require("lodash");
 var chalk = require("chalk");
-var open = require("open");
+var open = require("opn");
 
 var api = require("../lib/api");
 var Command = require("../lib/command");
diff --git a/gulpfile.js b/gulpfile.js
index 7e3cba5b..0cef5a8e 100644
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -59,8 +59,8 @@ gulp.task("test", function() {
 
 // Reruns the linter every time a JavaScript file changes
 gulp.task("watch", function() {
-  gulp.watch(paths.js, ["lint"]);
+  gulp.watch(paths.js, gulp.series("lint"));
 });
 
 // Default task
-gulp.task("default", ["lint", "test"]);
+gulp.task("default", gulp.series("lint", "test"));
diff --git a/lib/auth.js b/lib/auth.js
index f782f8d6..c70fb620 100644
--- a/lib/auth.js
+++ b/lib/auth.js
@@ -5,7 +5,7 @@ var chalk = require("chalk");
 var fs = require("fs");
 var jwt = require("jsonwebtoken");
 var http = require("http");
-var open = require("open");
+var open = require("opn");
 var path = require("path");
 var portfinder = require("portfinder");
 var url = require("url");
diff --git a/package.json b/package.json
index 3c4956cd..18972bb2 100644
--- a/package.json
+++ b/package.json
@@ -70,7 +70,7 @@
     "jsonwebtoken": "^8.2.1",
     "lodash": "^4.6.1",
     "minimatch": "^3.0.4",
-    "open": "^0.0.5",
+    "opn": "^5.3.0",
     "ora": "0.2.3",
     "portfinder": "^1.0.13",
     "progress": "^2.0.0",
@@ -88,11 +88,16 @@
   "devDependencies": {
     "chai": "^3.0.0",
     "chai-as-promised": "^5.1.0",
-    "coveralls": "2.11.2",
+    "coveralls": "^3.0.1",
     "eslint": "^4.19.1",
     "eslint-plugin-prettier": "^2.6.0",
+    "gulp": "^4.0.0",
+    "gulp-eslint": "^4.0.2",
+    "gulp-exit": "0.0.2",
+    "gulp-istanbul": "^1.1.3",
+    "gulp-mocha": "^6.0.0",
     "mocha": "^5.0.5",
-    "nock": "^2.10.0",
+    "nock": "^9.3.3",
     "nyc": "^11.6.0",
     "prettier": "1.11.1",
     "sinon": "^1.17.4",