diff --git a/package.json b/package.json
index 7fe320f92..20d6b8c23 100644
--- a/package.json
+++ b/package.json
@@ -45,7 +45,7 @@
     "lodash": "4.16.6",
     "lodash-doc-globals": "^0.1.1",
     "markdown-doctest": "^0.9.0",
-    "optional-dev-dependency": "^1.4.0",
+    "optional-dev-dependency": "^2.0.0",
     "platform": "^1.3.2",
     "qunit-extras": "^3.0.0",
     "qunitjs": "^2.0.1",
diff --git a/yarn.lock b/yarn.lock
index 3b2c22ff0..4e8a13511 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1008,11 +1008,12 @@ coveralls@^2.11.14:
     minimist "1.2.0"
     request "2.75.0"
 
-cross-spawn@^4.0.2:
-  version "4.0.2"
-  resolved "https://registry.yarnpkg.com/cross-spawn/-/cross-spawn-4.0.2.tgz#7b9247621c23adfdd3856004a823cbe397424d41"
+cross-spawn@^5.0.1:
+  version "5.0.1"
+  resolved "https://registry.yarnpkg.com/cross-spawn/-/cross-spawn-5.0.1.tgz#a3bbb302db2297cbea3c04edf36941f4613aa399"
   dependencies:
     lru-cache "^4.0.1"
+    shebang-command "^1.2.0"
     which "^1.2.9"
 
 cryptiles@0.2.x:
@@ -2232,14 +2233,14 @@ optimist@^0.6.1, optimist@~0.6.0:
     minimist "~0.0.1"
     wordwrap "~0.0.2"
 
-optional-dev-dependency@^1.4.0:
-  version "1.4.0"
-  resolved "https://registry.yarnpkg.com/optional-dev-dependency/-/optional-dev-dependency-1.4.0.tgz#12e155192069e40c9619115d89b35128bfd08b83"
+optional-dev-dependency@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/optional-dev-dependency/-/optional-dev-dependency-2.0.0.tgz#4ad58b80d5cf0bb0ea99b4b1896e099982b4033e"
   dependencies:
     async "^2.1.2"
-    cross-spawn "^4.0.2"
+    cross-spawn "^5.0.1"
     lodash.assign "^4.2.0"
-    yargs "^6.2.0"
+    yargs "^6.3.0"
 
 optionator@^0.8.1:
   version "0.8.2"
@@ -2708,6 +2709,12 @@ sha.js@2.2.6:
   version "2.2.6"
   resolved "https://registry.yarnpkg.com/sha.js/-/sha.js-2.2.6.tgz#17ddeddc5f722fb66501658895461977867315ba"
 
+shebang-command@^1.2.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/shebang-command/-/shebang-command-1.2.0.tgz#44aac65b695b03398968c39f363fee5deafdf1ea"
+  dependencies:
+    shebang-regex "^1.0.0"
+
 shebang-regex@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/shebang-regex/-/shebang-regex-1.0.0.tgz#da42f49740c0b42db2ca9728571cb190c98efea3"
@@ -3179,7 +3186,7 @@ yargs-parser@^4.0.2:
   dependencies:
     camelcase "^3.0.0"
 
-yargs@^6.2.0:
+yargs@^6.3.0:
   version "6.3.0"
   resolved "https://registry.yarnpkg.com/yargs/-/yargs-6.3.0.tgz#19c6dbb768744d571eb6ebae0c174cf2f71b188d"
   dependencies: