diff --git a/package.json b/package.json
index 6990d78..7ddb963 100644
--- a/package.json
+++ b/package.json
@@ -22,7 +22,7 @@
     "expect": "1.20.2",
     "mocha": "3.4.2",
     "nodemon": "1.11.0",
-    "npm-run-all": "4.1.3",
+    "npm-run-all": "4.1.5",
     "prettier": "1.12.1"
   }
 }
diff --git a/yarn.lock b/yarn.lock
index cb950ca..cffc207 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -32,7 +32,7 @@ ansi-styles@^2.2.1:
   version "2.2.1"
   resolved "https://registry.yarnpkg.com/ansi-styles/-/ansi-styles-2.2.1.tgz#b432dd3358b634cf75e1e4664368240533c1ddbe"
 
-ansi-styles@^3.2.0, ansi-styles@^3.2.1:
+ansi-styles@^3.2.1:
   version "3.2.1"
   resolved "https://registry.yarnpkg.com/ansi-styles/-/ansi-styles-3.2.1.tgz#41fbb20243e50b12be0f04b8dedbf07520ce841d"
   dependencies:
@@ -215,7 +215,7 @@ chalk@^1.0.0:
     strip-ansi "^3.0.0"
     supports-color "^2.0.0"
 
-chalk@^2.1.0:
+chalk@^2.4.1:
   version "2.4.1"
   resolved "https://registry.yarnpkg.com/chalk/-/chalk-2.4.1.tgz#18c49ab16a037b6eb0152cc83e3471338215b66e"
   dependencies:
@@ -329,7 +329,7 @@ core-util-is@~1.0.0:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/core-util-is/-/core-util-is-1.0.2.tgz#b5fd54220aa2bc5ab57aab7140c940754503c1a7"
 
-cross-spawn@^6.0.4:
+cross-spawn@^6.0.5:
   version "6.0.5"
   resolved "https://registry.yarnpkg.com/cross-spawn/-/cross-spawn-6.0.5.tgz#4a5ec7c64dfae22c3a14124dbacdee846d80cbc4"
   dependencies:
@@ -1387,16 +1387,16 @@ normalize-path@^2.0.1:
   dependencies:
     remove-trailing-separator "^1.0.1"
 
-npm-run-all@4.1.3:
-  version "4.1.3"
-  resolved "https://registry.yarnpkg.com/npm-run-all/-/npm-run-all-4.1.3.tgz#49f15b55a66bb4101664ce270cb18e7103f8f185"
+npm-run-all@4.1.5:
+  version "4.1.5"
+  resolved "https://registry.yarnpkg.com/npm-run-all/-/npm-run-all-4.1.5.tgz#04476202a15ee0e2e214080861bff12a51d98fba"
   dependencies:
-    ansi-styles "^3.2.0"
-    chalk "^2.1.0"
-    cross-spawn "^6.0.4"
+    ansi-styles "^3.2.1"
+    chalk "^2.4.1"
+    cross-spawn "^6.0.5"
     memorystream "^0.3.1"
     minimatch "^3.0.4"
-    ps-tree "^1.1.0"
+    pidtree "^0.3.0"
     read-pkg "^3.0.0"
     shell-quote "^1.6.1"
     string.prototype.padend "^3.0.0"
@@ -1560,6 +1560,10 @@ performance-now@^0.2.0:
   version "0.2.0"
   resolved "https://registry.yarnpkg.com/performance-now/-/performance-now-0.2.0.tgz#33ef30c5c77d4ea21c5a53869d91b56d8f2555e5"
 
+pidtree@^0.3.0:
+  version "0.3.0"
+  resolved "https://registry.yarnpkg.com/pidtree/-/pidtree-0.3.0.tgz#f6fada10fccc9f99bf50e90d0b23d72c9ebc2e6b"
+
 pify@^3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/pify/-/pify-3.0.0.tgz#e5a4acd2c101fdf3d9a4d07f0dbc4db49dd28176"
@@ -1597,7 +1601,7 @@ proxy-addr@~1.1.4:
     forwarded "~0.1.0"
     ipaddr.js "1.3.0"
 
-ps-tree@^1.0.1, ps-tree@^1.1.0:
+ps-tree@^1.0.1:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/ps-tree/-/ps-tree-1.1.0.tgz#b421b24140d6203f1ed3c76996b4427b08e8c014"
   dependencies: