diff --git a/README.md b/README.md
index 56b88a1..0f3486c 100644
--- a/README.md
+++ b/README.md
@@ -6,8 +6,8 @@ Usage: openapi-mock [options] <spec>
 Options:
 
   -V, --version        output the version number
-  -m, --mock <dir>     Mock directory
-  -c, --config <file>  Config file
-  -p, --port <n>       Port
+  -m, --mock <dir>     path to mock directory
+  -c, --config <file>  path to config file
+  -p, --port <n>       port to start the mock server on
   -h, --help           output usage information
-  ```
+```
diff --git a/app.js b/app.js
index df2ccae..e154eef 100644
--- a/app.js
+++ b/app.js
@@ -1,27 +1,37 @@
 'use strict';
 
-var SwaggerExpress = require('swagger-express-mw');
+// Patched version of swagger-node-runner waiting on https://github.com/theganyo/swagger-node-runner/pull/119
+var Runner = require('@penx/swagger-node-runner');
 var app = require('express')();
 var path = require('path');
 
 module.exports = app; // for testing
 
-function createApp({spec = './example/spec/petstore.json', mock, config = '.', port = process.env.PORT || 10010} = {}) {
+function registerApp(runner, port) {
+  const swaggerExpress = runner.expressMiddleware();
+  swaggerExpress.register(app);
+  app.listen(port);
+  console.log('Paths:')
+  console.log(Object.keys(swaggerExpress.runner.swagger.paths));
+  console.log('Server running at http://127.0.0.1:' + port);
+};
+
+function createApp({
+  spec = path.join(__dirname, './example/spec/petstore.json'),
+  mock,
+  config = path.join(__dirname, '.'),
+  port = process.env.PORT || 10010} = {}) {
   // If spec not defined, load example
   // If config not defined, load default
   var config = {
-    configDir:  path.join(__dirname, config),
-    swaggerFile: path.join(__dirname, spec),
+    configDir: config,
+    swaggerFile: spec,
     appRoot: __dirname
   };
 
-  SwaggerExpress.create(config, function(err, swaggerExpress) {
+  Runner.create(config, function(err, runner) {
     if (err) { throw err; }
-    swaggerExpress.register(app);
-    app.listen(port);
-    console.log('Paths:')
-    console.log(Object.keys(swaggerExpress.runner.swagger.paths));
-    console.log('Server running at http://127.0.0.1:' + port);
+    registerApp(runner, port);
   });
 
   return app;
diff --git a/cli.js b/cli.js
index 55f3a1f..7632cb7 100755
--- a/cli.js
+++ b/cli.js
@@ -1,19 +1,25 @@
 #!/usr/bin/env node
 
 var program = require('commander');
+var path = require('path');
 var {version} = require('./package.json');
 var app = require('./app.js');
 
+function resolvePath(relativePath) {
+  console.log(path.join(process.cwd(), relativePath))
+  return path.join(process.cwd(), relativePath);
+}
+
 program
   .version(version)
   .usage('[options] <spec>')
-  .option('-m, --mock <dir>', 'Mock directory')
-  .option('-c, --config <file>', 'Config file')
-  .option('-p, --port <n>', 'Port', parseInt);
+  .option('-m, --mock <dir>', 'path to mock directory', resolvePath)
+  .option('-c, --config <file>', 'path to config file', resolvePath)
+  .option('-p, --port <n>', 'port to start the mock server on', parseInt);
 
 program.parse(process.argv);
 
-const spec = program.args[0];
+const spec = program.args[0] ? resolvePath(program.args[0]) : undefined;
 const {mock, config, port} = program;
 
 app({spec, mock, config, port})
diff --git a/example/package.json b/example/package.json
index c0891e4..357a8f8 100644
--- a/example/package.json
+++ b/example/package.json
@@ -10,7 +10,7 @@
     "openapi-mock": "0.0.1"
   },
   "scripts": {
-    "start": "openapi-mock -m ./mocks -s ./spec/petstore.json"
+    "start": "openapi-mock -m ./mocks -p 9092 ./spec/petstore.json"
   },
   "devDependencies": {},
   "repository": {
diff --git a/package-lock.json b/package-lock.json
index 171e14e..22219f9 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4,6 +4,26 @@
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
+    "@penx/swagger-node-runner": {
+      "version": "0.7.3",
+      "resolved": "https://registry.npmjs.org/@penx/swagger-node-runner/-/swagger-node-runner-0.7.3.tgz",
+      "integrity": "sha512-U/FbKSn0D92EVjI+WC6D5wkbXYm3tj+fFSStmhN86nlZKtyg5WlQ7DI2Bh5uO/YHdFFT+BGLP3qv0YN75a0GWw==",
+      "requires": {
+        "async": "1.5.2",
+        "bagpipes": "0.1.1",
+        "body-parser": "1.18.2",
+        "config": "1.29.4",
+        "cors": "2.8.4",
+        "debug": "2.6.9",
+        "js-yaml": "3.10.0",
+        "lodash": "3.10.1",
+        "multer": "1.3.0",
+        "parseurl": "1.3.2",
+        "qs": "6.5.1",
+        "sway": "1.0.0",
+        "type-is": "1.6.15"
+      }
+    },
     "accepts": {
       "version": "1.3.4",
       "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.4.tgz",
@@ -24,11 +44,6 @@
         "json-schema-traverse": "0.3.1"
       }
     },
-    "ansi-regex": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-3.0.0.tgz",
-      "integrity": "sha1-7QMXwyIGT3lGbAKWa922Bas32Zg="
-    },
     "append-field": {
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/append-field/-/append-field-0.1.0.tgz",
@@ -182,11 +197,6 @@
       "resolved": "https://registry.npmjs.org/bytes/-/bytes-3.0.0.tgz",
       "integrity": "sha1-0ygVQE1olpn4Wk6k+odV3ROpYEg="
     },
-    "camelcase": {
-      "version": "4.1.0",
-      "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-4.1.0.tgz",
-      "integrity": "sha1-1UVjW+HjPFQmScaRc+Xeas+uNN0="
-    },
     "caseless": {
       "version": "0.12.0",
       "resolved": "https://registry.npmjs.org/caseless/-/caseless-0.12.0.tgz",
@@ -197,26 +207,11 @@
       "resolved": "https://registry.npmjs.org/chance/-/chance-1.0.13.tgz",
       "integrity": "sha512-9cpcgmAIQiXC0eMgQuMZgXuHR2Y+gKUyGQnalqSAg5LlUJyJFsZeKyuHVSGhj+bx18ppH+Jo3VOayNeXR/7p9Q=="
     },
-    "cliui": {
-      "version": "4.0.0",
-      "resolved": "https://registry.npmjs.org/cliui/-/cliui-4.0.0.tgz",
-      "integrity": "sha512-nY3W5Gu2racvdDk//ELReY+dHjb9PlIcVDFXP72nVIhq2Gy3LuVXYwJoPVudwQnv1shtohpgkdCKT2YaKY0CKw==",
-      "requires": {
-        "string-width": "2.1.1",
-        "strip-ansi": "4.0.0",
-        "wrap-ansi": "2.1.0"
-      }
-    },
     "co": {
       "version": "4.6.0",
       "resolved": "https://registry.npmjs.org/co/-/co-4.6.0.tgz",
       "integrity": "sha1-bqa989hTrlTMuOR7+gvz+QMfsYQ="
     },
-    "code-point-at": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/code-point-at/-/code-point-at-1.1.0.tgz",
-      "integrity": "sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c="
-    },
     "combined-stream": {
       "version": "1.0.5",
       "resolved": "https://registry.npmjs.org/combined-stream/-/combined-stream-1.0.5.tgz",
@@ -298,16 +293,6 @@
         "vary": "1.1.2"
       }
     },
-    "cross-spawn": {
-      "version": "5.1.0",
-      "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-5.1.0.tgz",
-      "integrity": "sha1-6L0O/uWPz/b4+UUQoKVUu/ojVEk=",
-      "requires": {
-        "lru-cache": "4.1.1",
-        "shebang-command": "1.2.0",
-        "which": "1.3.0"
-      }
-    },
     "cryptiles": {
       "version": "3.1.2",
       "resolved": "https://registry.npmjs.org/cryptiles/-/cryptiles-3.1.2.tgz",
@@ -334,10 +319,13 @@
         "assert-plus": "1.0.0"
       }
     },
-    "decamelize": {
-      "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/decamelize/-/decamelize-1.2.0.tgz",
-      "integrity": "sha1-9lNNFRSCabIDUue+4m9QH5oZEpA="
+    "debug": {
+      "version": "2.6.9",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
+      "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
+      "requires": {
+        "ms": "2.0.0"
+      }
     },
     "deep-extend": {
       "version": "0.4.2",
@@ -438,20 +426,6 @@
       "resolved": "https://registry.npmjs.org/etag/-/etag-1.8.1.tgz",
       "integrity": "sha1-Qa4u62XvpiJorr/qg6x9eSmbCIc="
     },
-    "execa": {
-      "version": "0.7.0",
-      "resolved": "https://registry.npmjs.org/execa/-/execa-0.7.0.tgz",
-      "integrity": "sha1-lEvs00zEHuMqY6n68nrVpl/Fl3c=",
-      "requires": {
-        "cross-spawn": "5.1.0",
-        "get-stream": "3.0.0",
-        "is-stream": "1.1.0",
-        "npm-run-path": "2.0.2",
-        "p-finally": "1.0.0",
-        "signal-exit": "3.0.2",
-        "strip-eof": "1.0.0"
-      }
-    },
     "express": {
       "version": "4.16.2",
       "resolved": "https://registry.npmjs.org/express/-/express-4.16.2.tgz",
@@ -548,14 +522,6 @@
         }
       }
     },
-    "find-up": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/find-up/-/find-up-2.1.0.tgz",
-      "integrity": "sha1-RdG35QbHF93UgndaK3eSCjwMV6c=",
-      "requires": {
-        "locate-path": "2.0.0"
-      }
-    },
     "forever-agent": {
       "version": "0.6.1",
       "resolved": "https://registry.npmjs.org/forever-agent/-/forever-agent-0.6.1.tgz",
@@ -586,16 +552,6 @@
       "resolved": "https://registry.npmjs.org/fresh/-/fresh-0.5.2.tgz",
       "integrity": "sha1-PYyt2Q2XZWn6g1qx+OSyOhBWBac="
     },
-    "get-caller-file": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/get-caller-file/-/get-caller-file-1.0.2.tgz",
-      "integrity": "sha1-9wLmMSfn4jHBYKgMFVSstw1QR+U="
-    },
-    "get-stream": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/get-stream/-/get-stream-3.0.0.tgz",
-      "integrity": "sha1-jpQ9E1jcN1VQVOy+LtsFqhdO3hQ="
-    },
     "getpass": {
       "version": "0.1.7",
       "resolved": "https://registry.npmjs.org/getpass/-/getpass-0.1.7.tgz",
@@ -692,26 +648,11 @@
       "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.3.tgz",
       "integrity": "sha1-Yzwsg+PaQqUC9SRmAiSA9CCCYd4="
     },
-    "invert-kv": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/invert-kv/-/invert-kv-1.0.0.tgz",
-      "integrity": "sha1-EEqOSqym09jNFXqO+L+rLXo//bY="
-    },
     "ipaddr.js": {
       "version": "1.5.2",
       "resolved": "https://registry.npmjs.org/ipaddr.js/-/ipaddr.js-1.5.2.tgz",
       "integrity": "sha1-1LUFvemUaYfM8PxY2QEP+WB+P6A="
     },
-    "is-fullwidth-code-point": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-2.0.0.tgz",
-      "integrity": "sha1-o7MKXE8ZkYMWeqq5O+764937ZU8="
-    },
-    "is-stream": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/is-stream/-/is-stream-1.1.0.tgz",
-      "integrity": "sha1-EtSj3U5o4Lec6428hBc66A2RykQ="
-    },
     "is-typedarray": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/is-typedarray/-/is-typedarray-1.0.0.tgz",
@@ -722,11 +663,6 @@
       "resolved": "https://registry.npmjs.org/isarray/-/isarray-1.0.0.tgz",
       "integrity": "sha1-u5NdSFgsuhaMBoNJV6VKPgcSTxE="
     },
-    "isexe": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/isexe/-/isexe-2.0.0.tgz",
-      "integrity": "sha1-6PvzdNxVb/iUehDcsFctYz8s+hA="
-    },
     "isstream": {
       "version": "0.1.2",
       "resolved": "https://registry.npmjs.org/isstream/-/isstream-0.1.2.tgz",
@@ -813,23 +749,6 @@
         "verror": "1.10.0"
       }
     },
-    "lcid": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/lcid/-/lcid-1.0.0.tgz",
-      "integrity": "sha1-MIrMr6C8SDo4Z7S28rlQYlHRuDU=",
-      "requires": {
-        "invert-kv": "1.0.0"
-      }
-    },
-    "locate-path": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-2.0.0.tgz",
-      "integrity": "sha1-K1aLJl7slExtnA3pw9u7ygNUzY4=",
-      "requires": {
-        "p-locate": "2.0.0",
-        "path-exists": "3.0.0"
-      }
-    },
     "lodash": {
       "version": "3.10.1",
       "resolved": "https://registry.npmjs.org/lodash/-/lodash-3.10.1.tgz",
@@ -845,15 +764,6 @@
       "resolved": "https://registry.npmjs.org/lodash.isequal/-/lodash.isequal-4.5.0.tgz",
       "integrity": "sha1-QVxEePK8wwEgwizhDtMib30+GOA="
     },
-    "lru-cache": {
-      "version": "4.1.1",
-      "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-4.1.1.tgz",
-      "integrity": "sha512-q4spe4KTfsAS1SUHLO0wz8Qiyf1+vMIAgpRYioFYDMNqKfHQbg+AVDH3i4fvpl71/P1L0dBl+fQi+P37UYf0ew==",
-      "requires": {
-        "pseudomap": "1.0.2",
-        "yallist": "2.1.2"
-      }
-    },
     "machine": {
       "version": "10.4.0",
       "resolved": "https://registry.npmjs.org/machine/-/machine-10.4.0.tgz",
@@ -950,14 +860,6 @@
       "resolved": "https://registry.npmjs.org/media-typer/-/media-typer-0.3.0.tgz",
       "integrity": "sha1-hxDXrwqmJvj/+hzgAWhUUmMlV0g="
     },
-    "mem": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/mem/-/mem-1.1.0.tgz",
-      "integrity": "sha1-Xt1StIXKHZAP5kiVUFOZoN+kX3Y=",
-      "requires": {
-        "mimic-fn": "1.2.0"
-      }
-    },
     "merge-descriptors": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/merge-descriptors/-/merge-descriptors-1.0.1.tgz",
@@ -986,11 +888,6 @@
         "mime-db": "1.30.0"
       }
     },
-    "mimic-fn": {
-      "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/mimic-fn/-/mimic-fn-1.2.0.tgz",
-      "integrity": "sha512-jf84uxzwiuiIVKiOLpfYk7N46TSy8ubTonmneY9vrpHNAnp0QBt2BxWV9dO3/j+BoVAb+a5G6YDPW3M5HOdMWQ=="
-    },
     "minimist": {
       "version": "0.0.8",
       "resolved": "https://registry.npmjs.org/minimist/-/minimist-0.0.8.tgz",
@@ -1046,19 +943,6 @@
       "resolved": "https://registry.npmjs.org/negotiator/-/negotiator-0.6.1.tgz",
       "integrity": "sha1-KzJxhOiZIQEXeyhWP7XnECrNDKk="
     },
-    "npm-run-path": {
-      "version": "2.0.2",
-      "resolved": "https://registry.npmjs.org/npm-run-path/-/npm-run-path-2.0.2.tgz",
-      "integrity": "sha1-NakjLfo11wZ7TLLd8jV7GHFTbF8=",
-      "requires": {
-        "path-key": "2.0.1"
-      }
-    },
-    "number-is-nan": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/number-is-nan/-/number-is-nan-1.0.1.tgz",
-      "integrity": "sha1-CXtgK1NCKlIsGvuHkDGDNpQaAR0="
-    },
     "oauth-sign": {
       "version": "0.8.2",
       "resolved": "https://registry.npmjs.org/oauth-sign/-/oauth-sign-0.8.2.tgz",
@@ -1087,57 +971,11 @@
       "resolved": "https://registry.npmjs.org/os-homedir/-/os-homedir-1.0.2.tgz",
       "integrity": "sha1-/7xJiDNuDoM94MFox+8VISGqf7M="
     },
-    "os-locale": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/os-locale/-/os-locale-2.1.0.tgz",
-      "integrity": "sha512-3sslG3zJbEYcaC4YVAvDorjGxc7tv6KVATnLPZONiljsUncvihe9BQoVCEs0RZ1kmf4Hk9OBqlZfJZWI4GanKA==",
-      "requires": {
-        "execa": "0.7.0",
-        "lcid": "1.0.0",
-        "mem": "1.1.0"
-      }
-    },
-    "p-finally": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/p-finally/-/p-finally-1.0.0.tgz",
-      "integrity": "sha1-P7z7FbiZpEEjs0ttzBi3JDNqLK4="
-    },
-    "p-limit": {
-      "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-1.2.0.tgz",
-      "integrity": "sha512-Y/OtIaXtUPr4/YpMv1pCL5L5ed0rumAaAeBSj12F+bSlMdys7i8oQF/GUJmfpTS/QoaRrS/k6pma29haJpsMng==",
-      "requires": {
-        "p-try": "1.0.0"
-      }
-    },
-    "p-locate": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/p-locate/-/p-locate-2.0.0.tgz",
-      "integrity": "sha1-IKAQOyIqcMj9OcwuWAaA893l7EM=",
-      "requires": {
-        "p-limit": "1.2.0"
-      }
-    },
-    "p-try": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/p-try/-/p-try-1.0.0.tgz",
-      "integrity": "sha1-y8ec26+P1CKOE/Yh8rGiN8GyB7M="
-    },
     "parseurl": {
       "version": "1.3.2",
       "resolved": "https://registry.npmjs.org/parseurl/-/parseurl-1.3.2.tgz",
       "integrity": "sha1-/CidTtiZMRlGDBViUyYs3I3mW/M="
     },
-    "path-exists": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/path-exists/-/path-exists-3.0.0.tgz",
-      "integrity": "sha1-zg6+ql94yxiSXqfYENe1mwEP1RU="
-    },
-    "path-key": {
-      "version": "2.0.1",
-      "resolved": "https://registry.npmjs.org/path-key/-/path-key-2.0.1.tgz",
-      "integrity": "sha1-QRyttXTFoUDTpLGRDUDYDMn0C0A="
-    },
     "path-loader": {
       "version": "1.0.4",
       "resolved": "https://registry.npmjs.org/path-loader/-/path-loader-1.0.4.tgz",
@@ -1203,11 +1041,6 @@
         "ipaddr.js": "1.5.2"
       }
     },
-    "pseudomap": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/pseudomap/-/pseudomap-1.0.2.tgz",
-      "integrity": "sha1-8FKijacOYYkX7wqKw0wa5aaChrM="
-    },
     "punycode": {
       "version": "1.4.1",
       "resolved": "https://registry.npmjs.org/punycode/-/punycode-1.4.1.tgz",
@@ -1286,16 +1119,6 @@
         "uuid": "3.2.1"
       }
     },
-    "require-directory": {
-      "version": "2.1.1",
-      "resolved": "https://registry.npmjs.org/require-directory/-/require-directory-2.1.1.tgz",
-      "integrity": "sha1-jGStX9MNqxyXbiNE/+f3kqam30I="
-    },
-    "require-main-filename": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/require-main-filename/-/require-main-filename-1.0.1.tgz",
-      "integrity": "sha1-l/cXtp1IeE9fUmpsWqj/3aBVpNE="
-    },
     "ret": {
       "version": "0.1.15",
       "resolved": "https://registry.npmjs.org/ret/-/ret-0.1.15.tgz",
@@ -1355,34 +1178,11 @@
         "send": "0.16.1"
       }
     },
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diff --git a/package.json b/package.json
index 00cc3c6..c5479dc 100644
--- a/package.json
+++ b/package.json
@@ -9,7 +9,7 @@
   "dependencies": {
     "commander": "^2.14.1",
     "express": "^4.16.2",
-    "swagger-express-mw": "^0.7.0"
+    "@penx/swagger-node-runner": "^0.7.3"
   },
   "scripts": {
     "start": "node app.js",