diff --git a/package-lock.json b/package-lock.json
index a726c59..aefa84b 100644
--- a/package-lock.json
+++ b/package-lock.json
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+      "resolved": "https://registry.npmjs.org/validate-npm-package-name/-/validate-npm-package-name-3.0.0.tgz",
+      "integrity": "sha1-X6kS2B630MdK/BQN5zF/DKffQ34=",
+      "dev": true,
+      "requires": {
+        "builtins": "^1.0.3"
       }
     },
     "verror": {
@@ -5084,16 +5468,37 @@
       "integrity": "sha512-HxJdYWq1MTIQbJ3nw0cqssHoTNU267KlrDuGZ1WYlxDStUtKUhOaJmh112/TZmHxxUfuJqPXSOm7tDyas0OSIQ==",
       "dev": true,
       "requires": {
-        "isexe": "2.0.0"
+        "isexe": "^2.0.0"
       }
     },
     "widest-line": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/widest-line/-/widest-line-2.0.0.tgz",
-      "integrity": "sha1-AUKk6KJD+IgsAjOqDgKBqnYVInM=",
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/widest-line/-/widest-line-2.0.1.tgz",
+      "integrity": "sha512-Ba5m9/Fa4Xt9eb2ELXt77JxVDV8w7qQrH0zS/TWSJdLyAwQjWoOzpzj5lwVftDz6n/EOu3tNACS84v509qwnJA==",
       "dev": true,
       "requires": {
-        "string-width": "2.1.1"
+        "string-width": "^2.1.1"
+      }
+    },
+    "wrap-ansi": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-3.0.1.tgz",
+      "integrity": "sha1-KIoE2H7aXChuBg3+jxNc6NAH+Lo=",
+      "dev": true,
+      "requires": {
+        "string-width": "^2.1.1",
+        "strip-ansi": "^4.0.0"
+      },
+      "dependencies": {
+        "strip-ansi": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-4.0.0.tgz",
+          "integrity": "sha1-qEeQIusaw2iocTibY1JixQXuNo8=",
+          "dev": true,
+          "requires": {
+            "ansi-regex": "^3.0.0"
+          }
+        }
       }
     },
     "wrappy": {
@@ -5103,14 +5508,14 @@
       "dev": true
     },
     "write-file-atomic": {
-      "version": "2.3.0",
-      "resolved": "https://registry.npmjs.org/write-file-atomic/-/write-file-atomic-2.3.0.tgz",
-      "integrity": "sha512-xuPeK4OdjWqtfi59ylvVL0Yn35SF3zgcAcv7rBPFHVaEapaDr4GdGgm3j7ckTwH9wHL7fGmgfAnb0+THrHb8tA==",
+      "version": "2.4.2",
+      "resolved": "https://registry.npmjs.org/write-file-atomic/-/write-file-atomic-2.4.2.tgz",
+      "integrity": "sha512-s0b6vB3xIVRLWywa6X9TOMA7k9zio0TMOsl9ZnDkliA/cfJlpHXAscj0gbHVJiTdIuAYpIyqS5GW91fqm6gG5g==",
       "dev": true,
       "requires": {
-        "graceful-fs": "4.1.11",
-        "imurmurhash": "0.1.4",
-        "signal-exit": "3.0.2"
+        "graceful-fs": "^4.1.11",
+        "imurmurhash": "^0.1.4",
+        "signal-exit": "^3.0.2"
       }
     },
     "xdg-basedir": {
@@ -5126,12 +5531,12 @@
       "dev": true
     },
     "yargs-parser": {
-      "version": "10.0.0",
-      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-10.0.0.tgz",
-      "integrity": "sha512-+DHejWujTVYeMHLff8U96rLc4uE4Emncoftvn5AjhB1Jw1pWxLzgBUT/WYbPrHmy6YPEBTZQx5myHhVcuuu64g==",
+      "version": "10.1.0",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-10.1.0.tgz",
+      "integrity": "sha512-VCIyR1wJoEBZUqk5PA+oOBF6ypbwh5aNB3I50guxAL/quggdfs4TtNHQrSazFA3fYZ+tEqfs0zIGlv0c/rgjbQ==",
       "dev": true,
       "requires": {
-        "camelcase": "4.1.0"
+        "camelcase": "^4.1.0"
       }
     },
     "yn": {
diff --git a/package.json b/package.json
index 12935e3..9318dad 100644
--- a/package.json
+++ b/package.json
@@ -44,7 +44,7 @@
     "chai-as-promised": "^7.1.1",
     "codecov": "^3.0.2",
     "mocha": "^5.2.0",
-    "np": "^3.0.1",
+    "np": "^5.0.0",
     "nyc": "^12.0.1",
     "prettier": "^1.13.3",
     "proptest": "0.0.4",