diff --git a/package.json b/package.json
index d618bc2..a2fc65e 100644
--- a/package.json
+++ b/package.json
@@ -14,7 +14,7 @@
   },
   "dependencies": {
     "object-assign": "^4.1.0",
-    "stringz": "^1.0.0"
+    "string-width": "^3.0.0"
   },
   "devDependencies": {
     "ansi-256-colors": "^1.1.0",
@@ -76,7 +76,7 @@
       {
         "displayName": "test",
         "testMatch": [
-          "**/test/**/*-test(s)?.js"
+          "<rootDir>/test/*.js"
         ]
       },
       {
diff --git a/src/utils.js b/src/utils.js
index 8df9e68..c914955 100644
--- a/src/utils.js
+++ b/src/utils.js
@@ -1,5 +1,5 @@
 const objectAssign = require('object-assign');
-const stringz = require('stringz');
+const stringWidth = require('string-width');
 
 function codeRegex(capture) {
   return capture ? /\u001b\[((?:\d*;){0,5}\d*)m/g : /\u001b\[(?:\d*;){0,5}\d*m/g;
@@ -10,7 +10,7 @@ function strlen(str) {
   let stripped = ('' + str).replace(code, '');
   let split = stripped.split('\n');
   return split.reduce(function(memo, s) {
-    return stringz.length(s) > memo ? stringz.length(s) : memo;
+    return stringWidth(s) > memo ? stringWidth(s) : memo;
   }, 0);
 }
 
diff --git a/yarn.lock b/yarn.lock
index c43325f..9d40b6c 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1206,6 +1206,11 @@ ecc-jsbn@~0.1.1:
   dependencies:
     jsbn "~0.1.0"
 
+emoji-regex@^7.0.1:
+  version "7.0.1"
+  resolved "https://registry.yarnpkg.com/emoji-regex/-/emoji-regex-7.0.1.tgz#5a132b28ebf84a289ba692862f7d4206ebcd32d0"
+  integrity sha512-cjx7oFbFIyZMpmWaEBnKeJXWAVzjXwK6yHiz/5X73A2Ww4pnabw+4ZaA/MxLroIQQrB3dL6XzEz8P3aZsSdj8Q==
+
 encoding@^0.1.11:
   version "0.1.12"
   resolved "https://registry.yarnpkg.com/encoding/-/encoding-0.1.12.tgz#538b66f3ee62cd1ab51ec323829d1f9480c74beb"
@@ -4299,6 +4304,15 @@ string-width@^1.0.1:
     is-fullwidth-code-point "^2.0.0"
     strip-ansi "^4.0.0"
 
+string-width@^3.0.0:
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/string-width/-/string-width-3.1.0.tgz#22767be21b62af1081574306f69ac51b62203961"
+  integrity sha512-vafcv6KjVZKSgz06oM/H6GDBrAtz8vdhQakGjFIvNrHA6y3HCF1CInLy+QLq8dTJPQ1b+KDUqDFctkdRW44e1w==
+  dependencies:
+    emoji-regex "^7.0.1"
+    is-fullwidth-code-point "^2.0.0"
+    strip-ansi "^5.1.0"
+
 string.prototype.padend@^3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/string.prototype.padend/-/string.prototype.padend-3.0.0.tgz#f3aaef7c1719f170c5eab1c32bf780d96e21f2f0"
@@ -4315,13 +4329,6 @@ string_decoder@~1.1.1:
   dependencies:
     safe-buffer "~5.1.0"
 
-stringz@^1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/stringz/-/stringz-1.0.0.tgz#d2acba994e4ce3c725ee15c86fff4281280d2025"
-  integrity sha512-oaqFaIAmw1MJmdPNiBqocHHrC0VzJTL3CI1z5uXm3NQSE3AyDU152ZPTSJSOKk+9z1Cm3LZzgLFjCTb8SXZvag==
-  dependencies:
-    unicode-astral-regex "^1.0.1"
-
 strip-ansi@^3.0.0, strip-ansi@^3.0.1:
   version "3.0.1"
   resolved "https://registry.yarnpkg.com/strip-ansi/-/strip-ansi-3.0.1.tgz#6a385fb8853d952d5ff05d0e8aaf94278dc63dcf"
@@ -4336,7 +4343,7 @@ strip-ansi@^4.0.0:
   dependencies:
     ansi-regex "^3.0.0"
 
-strip-ansi@^5.0.0:
+strip-ansi@^5.0.0, strip-ansi@^5.1.0:
   version "5.1.0"
   resolved "https://registry.yarnpkg.com/strip-ansi/-/strip-ansi-5.1.0.tgz#55aaa54e33b4c0649a7338a43437b1887d153ec4"
   integrity sha512-TjxrkPONqO2Z8QDCpeE2j6n0M6EwxzyDgzEeGp+FbdvaJAt//ClYi6W5my+3ROlC/hZX2KACUwDfK49Ka5eDvg==
@@ -4553,11 +4560,6 @@ uglify-js@^3.1.4:
     commander "~2.17.1"
     source-map "~0.6.1"
 
-unicode-astral-regex@^1.0.1:
-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/unicode-astral-regex/-/unicode-astral-regex-1.0.1.tgz#2cab8529480646f9614ddbc7b62158ad05123feb"
-  integrity sha512-UP6cmDeiWi8bMDmkyXLRsDuVPTvPjh8Wsz+pHu1VkGgTBl4pUceYAdHXY0cdc6Q3+Z2q7QMzi/0E7L/S/yOvFw==
-
 union-value@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/union-value/-/union-value-1.0.0.tgz#5c71c34cb5bad5dcebe3ea0cd08207ba5aa1aea4"