diff --git a/package.json b/package.json
index f7f278d..3b24f7a 100644
--- a/package.json
+++ b/package.json
@@ -75,7 +75,7 @@
     "mocha": "^4.0.1",
     "nightwatch": "^0.9.12",
     "node-sass": "^4.7.1",
-    "opn": "^4.0.2",
+    "opn": "^5.1.0",
     "optimize-css-assets-webpack-plugin": "^1.3.0",
     "ora": "^1.1.0",
     "phantomjs-prebuilt": "^2.1.16",
diff --git a/yarn.lock b/yarn.lock
index 240b36c..fe2db21 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3428,6 +3428,10 @@ is-windows@^1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/is-windows/-/is-windows-1.0.1.tgz#310db70f742d259a16a369202b51af84233310d9"
 
+is-wsl@^1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/is-wsl/-/is-wsl-1.1.0.tgz#1f16e4aa22b04d1336b66188a66af3c600c3a66d"
+
 isarray@0.0.1:
   version "0.0.1"
   resolved "https://registry.yarnpkg.com/isarray/-/isarray-0.0.1.tgz#8a18acfca9a8f4177e09abfc6038939b05d1eedf"
@@ -4452,12 +4456,11 @@ opener@^1.4.3:
   version "1.4.3"
   resolved "https://registry.yarnpkg.com/opener/-/opener-1.4.3.tgz#5c6da2c5d7e5831e8ffa3964950f8d6674ac90b8"
 
-opn@^4.0.2:
-  version "4.0.2"
-  resolved "https://registry.yarnpkg.com/opn/-/opn-4.0.2.tgz#7abc22e644dff63b0a96d5ab7f2790c0f01abc95"
+opn@^5.1.0:
+  version "5.1.0"
+  resolved "https://registry.yarnpkg.com/opn/-/opn-5.1.0.tgz#72ce2306a17dbea58ff1041853352b4a8fc77519"
   dependencies:
-    object-assign "^4.0.1"
-    pinkie-promise "^2.0.0"
+    is-wsl "^1.1.0"
 
 optimist@0.6.1, optimist@^0.6.1:
   version "0.6.1"