diff --git a/package-lock.json b/package-lock.json
index 9a4942e..9142dc2 100644
--- a/package-lock.json
+++ b/package-lock.json
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+          "integrity": "sha512-8p0AUk4XODgIewSi0l8Epjs+EVnWiK7NoDIEGU0HhE7+ZyY8D1IMY7odu5lRrFXGg71L15KG8QrPmum45RTtdA==",
+          "dev": true,
+          "requires": {
+            "core-util-is": "~1.0.0",
+            "inherits": "~2.0.3",
+            "isarray": "~1.0.0",
+            "process-nextick-args": "~2.0.0",
+            "safe-buffer": "~5.1.1",
+            "string_decoder": "~1.1.1",
+            "util-deprecate": "~1.0.1"
+          }
+        },
+        "string_decoder": {
+          "version": "1.1.1",
+          "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
+          "integrity": "sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==",
+          "dev": true,
+          "requires": {
+            "safe-buffer": "~5.1.0"
+          }
+        }
       }
     },
     "tmp": {
@@ -5915,7 +5816,7 @@
     "trim": {
       "version": "0.0.1",
       "resolved": "https://registry.npmjs.org/trim/-/trim-0.0.1.tgz",
-      "integrity": "sha1-WFhUf2spB1fulczMZm+1AITEYN0=",
+      "integrity": "sha512-YzQV+TZg4AxpKxaTHK3c3D+kRDCGVEE7LemdlQZoQXn0iennk10RsIoY6ikzAqJTc9Xjl9C1/waHom/J86ziAQ==",
       "dev": true
     },
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@@ -6097,9 +5998,9 @@
       "integrity": "sha1-Z/4HXFwk/vOfnWX197f+dRcZaPw="
     },
     "xtend": {
-      "version": "4.0.1",
-      "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.1.tgz",
-      "integrity": "sha1-pcbVMr5lbiPbgg77lDofBJmNY68=",
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.2.tgz",
+      "integrity": "sha512-LKYU1iAXJXUgAXn9URjiu+MWhyUXHsvfp7mcuYm9dSUKK0/CjtrUwFAxD82/mCWbtLsGjFIad0wIsod4zrTAEQ==",
       "dev": true
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diff --git a/package.json b/package.json
index a7984f9..372e13e 100644
--- a/package.json
+++ b/package.json
@@ -39,7 +39,7 @@
     "npm-prepublish": "^1.2.3",
     "nyc": "^11.3.0",
     "rollup": "0.27",
-    "tap-spec": "^4.1.1",
+    "tap-spec": "^5.0.0",
     "tape": "4",
     "uglify-es": "^3.0.20"
   }