diff --git a/package-lock.json b/package-lock.json
index a00541e..0833d73 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -130,9 +130,18 @@
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+          "version": "3.1.0",
+          "resolved": "https://registry.npmjs.org/os-locale/-/os-locale-3.1.0.tgz",
+          "integrity": "sha512-Z8l3R4wYWM40/52Z+S265okfFj8Kt2cC2MKY+xNi3kFs+XGI7WXu/I309QQQYbRW4ijiZ+yxs9pqEhJh0DqW3Q==",
+          "requires": {
+            "execa": "1.0.0",
+            "lcid": "2.0.0",
+            "mem": "4.3.0"
+          }
+        },
         "p-limit": {
-          "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-2.0.0.tgz",
-          "integrity": "sha512-fl5s52lI5ahKCernzzIyAP0QAZbGIovtVHGwpcu1Jr/EpzLVDI2myISHwGqK7m8uQFugVWSrbxH7XnhGtvEc+A==",
+          "version": "2.2.0",
+          "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-2.2.0.tgz",
+          "integrity": "sha512-pZbTJpoUsCzV48Mc9Nh51VbwO0X9cuPFE8gYwx9BTCt9SF8/b7Zljd2fVgOxhIF/HDTKgpVzs+GPhyKfjLLFRQ==",
           "requires": {
-            "p-try": "2.0.0"
+            "p-try": "2.2.0"
           }
         },
         "p-locate": {
@@ -3808,20 +3915,49 @@
           "resolved": "https://registry.npmjs.org/p-locate/-/p-locate-3.0.0.tgz",
           "integrity": "sha512-x+12w/To+4GFfgJhBEpiDcLozRJGegY+Ei7/z0tSLkMmxGZNybVMSfWj9aJn8Z5Fc7dBUNJOOVgPv2H7IwulSQ==",
           "requires": {
-            "p-limit": "2.0.0"
+            "p-limit": "2.2.0"
           }
         },
         "p-try": {
+          "version": "2.2.0",
+          "resolved": "https://registry.npmjs.org/p-try/-/p-try-2.2.0.tgz",
+          "integrity": "sha512-R4nPAVTAU0B9D35/Gk3uJf/7XYbQcyohSKdvAxIRSNghFl4e71hVoGnBNQz9cWaXxO2I10KTC+3jMdvvoKw6dQ=="
+        },
+        "require-main-filename": {
           "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/p-try/-/p-try-2.0.0.tgz",
-          "integrity": "sha512-hMp0onDKIajHfIkdRk3P4CdCmErkYAxxDtP3Wx/4nZ3aGlau2VKh3mZpcuFkH27WQkL/3WBCPOktzA9ZOAnMQQ=="
+          "resolved": "https://registry.npmjs.org/require-main-filename/-/require-main-filename-2.0.0.tgz",
+          "integrity": "sha512-NKN5kMDylKuldxYLSUfrbo5Tuzh4hd+2E8NPPX02mZtn1VuREQToYe/ZdlJy+J3uCpfaiGF05e7B8W0iXbQHmg=="
+        },
+        "string-width": {
+          "version": "3.1.0",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
+          "integrity": "sha512-vafcv6KjVZKSgz06oM/H6GDBrAtz8vdhQakGjFIvNrHA6y3HCF1CInLy+QLq8dTJPQ1b+KDUqDFctkdRW44e1w==",
+          "requires": {
+            "emoji-regex": "7.0.3",
+            "is-fullwidth-code-point": "2.0.0",
+            "strip-ansi": "5.2.0"
+          }
+        },
+        "strip-ansi": {
+          "version": "5.2.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
+          "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
+          "requires": {
+            "ansi-regex": "4.1.0"
+          }
+        },
+        "y18n": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz",
+          "integrity": "sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w=="
         },
         "yargs-parser": {
-          "version": "10.1.0",
-          "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-10.1.0.tgz",
-          "integrity": "sha512-VCIyR1wJoEBZUqk5PA+oOBF6ypbwh5aNB3I50guxAL/quggdfs4TtNHQrSazFA3fYZ+tEqfs0zIGlv0c/rgjbQ==",
+          "version": "13.0.0",
+          "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.0.0.tgz",
+          "integrity": "sha512-w2LXjoL8oRdRQN+hOyppuXs+V/fVAYtpcrRxZuF7Kt/Oc+Jr2uAcVntaUTNT6w5ihoWfFDpNY8CPx1QskxZ/pw==",
           "requires": {
-            "camelcase": "4.1.0"
+            "camelcase": "5.3.1",
+            "decamelize": "1.2.0"
           }
         }
       }
diff --git a/package.json b/package.json
index dc9a79a..b199622 100644
--- a/package.json
+++ b/package.json
@@ -19,8 +19,8 @@
   ],
   "dependencies": {
     "circular-json": "^0.5.9",
-    "debug": "4.1.1",
-    "yargs": "12.0.1"
+    "debug": "^4.1.1",
+    "yargs": "^13.2.2"
   },
   "repository": {
     "type": "git",
@@ -68,7 +68,7 @@
     "@types/debug": "^4.1.4",
     "@types/mocha": "^5.2.1",
     "@types/node": "^10.1.3",
-    "@types/yargs": "^11.0.0",
+    "@types/yargs": "^13.0.0",
     "babel-plugin-transform-react-jsx": "^6.24.1",
     "babel-register": "^6.26.0",
     "chai": "^4.2.0",
diff --git a/src/bin/cli.ts b/src/bin/cli.ts
index 8a8ff58..5a3dccd 100755
--- a/src/bin/cli.ts
+++ b/src/bin/cli.ts
@@ -97,16 +97,19 @@ const argv = yargs
     alias: 't',
     number: true,
   })
+  .option('timeouts', {
+    boolean: true,
+  })
   .parse(process.argv);
 
 // --async-only
-applyAsyncOnly(mocha, argv.asyncOnly);
+applyAsyncOnly(mocha, argv['async-only']);
 
 // --bail
 applyBail(mocha, argv.bail);
 
 // --check-leaks
-applyCheckLeaks(mocha, argv.checkLeaks);
+applyCheckLeaks(mocha, argv['check-leaks']);
 
 // --compilers
 const { compilers, extensions } = applyCompilers(argv.compilers);
@@ -125,13 +128,13 @@ applyForbidOnly(mocha, argv.forbidOnly);
 applyForbidPending(mocha, argv.forbidPending);
 
 // --full-trace
-applyFullTrace(mocha, argv.fullTrace);
+applyFullTrace(mocha, argv['full-trace']);
 
 // --grep option
 applyGrepPattern(mocha, argv.grep);
 
 // --max-parallel
-applyMaxParallel(mocha, argv.maxParallel);
+applyMaxParallel(mocha, argv['max-parallel']);
 
 // --no-timeouts
 applyNoTimeouts(mocha, argv.timeouts);
@@ -141,8 +144,8 @@ const requires = applyRequires(argv.require);
 mocha.addRequiresForSubprocess(requires);
 
 // --reporter-options
-const reporterOptions = argv.reporterOptions !== undefined
-  ? applyReporterOptions(argv.reporterOptions)
+const reporterOptions = argv['reporter-options'] !== undefined
+  ? applyReporterOptions(argv['reporter-options'])
   : {};
 
 // --reporter
@@ -158,7 +161,7 @@ applySlow(mocha, argv.slow);
 applyTimeout(mocha, argv.timeout);
 
 // find files
-const files = getFilesList(argv._.slice(2), extensions, argv.recursive);
+const files = getFilesList(argv._.slice(2), extensions, argv.recursive || false);
 
 if (!files.length) {
   // tslint:disable-next-line:no-console
diff --git a/src/bin/options/async-only.ts b/src/bin/options/async-only.ts
index efcf2b1..76119d1 100644
--- a/src/bin/options/async-only.ts
+++ b/src/bin/options/async-only.ts
@@ -1,6 +1,6 @@
 import * as Mocha from 'mocha';
 
-export default function applyAsyncOnly(mocha: Mocha, asyncOnly: boolean) {
+export default function applyAsyncOnly(mocha: Mocha, asyncOnly?: boolean) {
   if (asyncOnly) {
     mocha.asyncOnly();
   }
diff --git a/src/bin/options/bail.ts b/src/bin/options/bail.ts
index a6173f3..8d2a8fa 100644
--- a/src/bin/options/bail.ts
+++ b/src/bin/options/bail.ts
@@ -1,5 +1,5 @@
 import * as Mocha from 'mocha';
 
-export default function applyBail(mocha: Mocha, bail: boolean) {
-  mocha.suite.bail(bail);
+export default function applyBail(mocha: Mocha, bail?: boolean) {
+  mocha.suite.bail(bail || false);
 }
diff --git a/src/bin/options/check-leaks.ts b/src/bin/options/check-leaks.ts
index f801ff7..4f811fb 100644
--- a/src/bin/options/check-leaks.ts
+++ b/src/bin/options/check-leaks.ts
@@ -1,6 +1,6 @@
 import * as Mocha from 'mocha';
 
-export default function applyCheckLeaks(mocha: Mocha, checkLeaks: boolean) {
+export default function applyCheckLeaks(mocha: Mocha, checkLeaks?: boolean) {
   if (checkLeaks) {
     mocha.checkLeaks();
   }
diff --git a/src/bin/options/exit.ts b/src/bin/options/exit.ts
index 1ab8732..3b52d2a 100644
--- a/src/bin/options/exit.ts
+++ b/src/bin/options/exit.ts
@@ -1,6 +1,6 @@
 import Mocha from '../../main/mocha';
 
-export default function applyExit(mocha: Mocha, exitMode: boolean) {
+export default function applyExit(mocha: Mocha, exitMode?: boolean) {
   if (exitMode) {
     mocha.enableExitMode();
   }
diff --git a/src/bin/options/forbid-only.ts b/src/bin/options/forbid-only.ts
index c0ec8b9..70d5b29 100644
--- a/src/bin/options/forbid-only.ts
+++ b/src/bin/options/forbid-only.ts
@@ -1,6 +1,6 @@
 import * as Mocha from 'mocha';
 
-export default function applyForbidOnly(mocha: Mocha, forbidOnly: boolean) {
+export default function applyForbidOnly(mocha: Mocha, forbidOnly?: boolean) {
   if (forbidOnly) {
     mocha.forbidOnly();
   }
diff --git a/src/bin/options/forbid-pending.ts b/src/bin/options/forbid-pending.ts
index f4206db..504dfd5 100644
--- a/src/bin/options/forbid-pending.ts
+++ b/src/bin/options/forbid-pending.ts
@@ -1,6 +1,6 @@
 import * as Mocha from 'mocha';
 
-export default function applyForbidPending(mocha: Mocha, forbidPending: boolean) {
+export default function applyForbidPending(mocha: Mocha, forbidPending?: boolean) {
   if (forbidPending) {
     mocha.forbidPending();
   }
diff --git a/src/bin/options/full-trace.ts b/src/bin/options/full-trace.ts
index f335209..1551eea 100644
--- a/src/bin/options/full-trace.ts
+++ b/src/bin/options/full-trace.ts
@@ -1,6 +1,6 @@
 import * as Mocha from 'mocha';
 
-export default function applyFullTrace(mocha: Mocha, fullTrace: boolean) {
+export default function applyFullTrace(mocha: Mocha, fullTrace?: boolean) {
   if (fullTrace) {
     mocha.fullTrace();
   }
diff --git a/src/bin/options/retries.ts b/src/bin/options/retries.ts
index 9403609..7326909 100644
--- a/src/bin/options/retries.ts
+++ b/src/bin/options/retries.ts
@@ -1,6 +1,6 @@
 import * as Mocha from 'mocha';
 
-export default function applyRetries(mocha: Mocha, retries: number) {
+export default function applyRetries(mocha: Mocha, retries?: number) {
   if (retries) {
     mocha.suite.retries(retries);
   }
diff --git a/src/bin/options/slow.ts b/src/bin/options/slow.ts
index a7724d0..2dda588 100644
--- a/src/bin/options/slow.ts
+++ b/src/bin/options/slow.ts
@@ -1,6 +1,6 @@
 import * as Mocha from 'mocha';
 
-export default function applySlow(mocha: Mocha, slow: number) {
+export default function applySlow(mocha: Mocha, slow?: number) {
   if (slow) {
     mocha.suite.slow(slow);
   }
diff --git a/src/subprocess/runner.ts b/src/subprocess/runner.ts
index c361c17..5627028 100755
--- a/src/subprocess/runner.ts
+++ b/src/subprocess/runner.ts
@@ -47,6 +47,10 @@ const argv = yargs
     boolean: true,
   })
   .number('slow')
+  .option('test', {
+    demandOption: true,
+    string: true,
+  })
   .option('require', {
     array: true,
     default: [],
@@ -256,7 +260,7 @@ applyRequires(argv.require);
 applyTimeouts(mocha, argv.timeout);
 
 // --full-trace
-applyFullTrace(mocha, argv.fullTrace);
+applyFullTrace(mocha, argv['full-trace']);
 
 // apply main process root suite properties
 for (const option of SUITE_OWN_OPTIONS) {
diff --git a/src/util.ts b/src/util.ts
index 8d3c99c..c266453 100644
--- a/src/util.ts
+++ b/src/util.ts
@@ -62,7 +62,7 @@ export function applyCompilers(compilers: any): ICLICompilers {
   return output;
 }
 
-export function applyDelay(mocha: Mocha, delay: boolean) {
+export function applyDelay(mocha: Mocha, delay?: boolean) {
   if (delay) {
     mocha.delay();
   }
@@ -74,13 +74,13 @@ export function applyGrepPattern(mocha: Mocha, stringPattern?: string) {
   }
 }
 
-export function applyNoTimeouts(mocha: Mocha, allowTimeouts: boolean) {
+export function applyNoTimeouts(mocha: Mocha, allowTimeouts?: boolean) {
   if (allowTimeouts === false) {
     mocha.enableTimeouts(false);
   }
 }
 
-export function applyTimeouts(mocha: Mocha, timeout: number) {
+export function applyTimeouts(mocha: Mocha, timeout?: number) {
   if (timeout) {
     mocha.suite.timeout(timeout);
   }