diff --git a/lib/merger.js b/lib/merger.js
index 7a719e7..82bd48e 100644
--- a/lib/merger.js
+++ b/lib/merger.js
@@ -16,6 +16,7 @@ class Merger {
 
     this.delimeter = delimeter || '\n\n';
     this.processedFiles = [];
+    this.nodeModulesRoot = null;
   }
 
   getPragmaRegex() {
@@ -38,6 +39,7 @@ class Merger {
   async processFile(file, isRoot) {
     if (isRoot) {
       this.processedFiles = [];
+      this.nodeModulesRoot = await this.getNodeModulesPath(file);
     }
     if (this.processedFiles.indexOf(file) !== -1) {
       log('%s %s', '⚠', file);
@@ -77,7 +79,7 @@ class Merger {
 
       let filePath = Utils.isRelative(_importFile) ?
         path.join(path.dirname(file), _importFile) :
-        path.join(await this.getNodeModulesPath(file), './' + _importFile);
+        path.join(this.nodeModulesRoot, './' + _importFile);
 
       filePath = path.normalize(filePath);
 
diff --git a/package-lock.json b/package-lock.json
index 7010655..bab04e4 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -10,7 +10,7 @@
       "integrity": "sha512-2++wDf/DYqkPR3o5tbfdhF96EfMApo1GpPfzOsR/ZYXdkSmELlvOOEAl9iKkRsktMPHdGjO4rtkBpf2I7TiTeA==",
       "dev": true,
       "requires": {
-        "xtend": "4.0.1"
+        "xtend": "~4.0.0"
       }
     },
     "acorn": {
@@ -25,7 +25,7 @@
       "integrity": "sha1-r9+UiPsezvyDSPb7IvRk4ypYs2s=",
       "dev": true,
       "requires": {
-        "acorn": "3.3.0"
+        "acorn": "^3.0.4"
       },
       "dependencies": {
         "acorn": {
@@ -48,10 +48,10 @@
       "integrity": "sha1-R8aNaehvXZUxA7AHSpQw3GPaXjk=",
       "dev": true,
       "requires": {
-        "co": "4.6.0",
-        "fast-deep-equal": "1.0.0",
-        "json-schema-traverse": "0.3.1",
-        "json-stable-stringify": "1.0.1"
+        "co": "^4.6.0",
+        "fast-deep-equal": "^1.0.0",
+        "json-schema-traverse": "^0.3.0",
+        "json-stable-stringify": "^1.0.1"
       }
     },
     "ajv-keywords": {
@@ -89,8 +89,8 @@
       "integrity": "sha1-u13KOCu5TwXhUZQ3PRb9O6HKEQ0=",
       "dev": true,
       "requires": {
-        "delegates": "1.0.0",
-        "readable-stream": "2.3.3"
+        "delegates": "^1.0.0",
+        "readable-stream": "^2.0.6"
       }
     },
     "argparse": {
@@ -99,7 +99,7 @@
       "integrity": "sha1-c9g7wmP4bpf4zE9rrhsOkKfSLIY=",
       "dev": true,
       "requires": {
-        "sprintf-js": "1.0.3"
+        "sprintf-js": "~1.0.2"
       }
     },
     "array-union": {
@@ -108,7 +108,7 @@
       "integrity": "sha1-mjRBDk9OPaI96jdb5b5w8kd47Dk=",
       "dev": true,
       "requires": {
-        "array-uniq": "1.0.3"
+        "array-uniq": "^1.0.1"
       }
     },
     "array-uniq": {
@@ -147,7 +147,7 @@
       "integrity": "sha512-e+lJAJeNWuPCNyxZKOBdaJGyLGHugXVQtrAwtuAe2vhxTYxFTKE73p8JuTmdH0qdQZtDvI4dhJwjZc5zsfIsYw==",
       "dev": true,
       "requires": {
-        "lodash": "4.17.4"
+        "lodash": "^4.14.0"
       }
     },
     "async-eventemitter": {
@@ -156,7 +156,7 @@
       "integrity": "sha1-959IDf2mZFqXvWFCwBcVDWO05w4=",
       "dev": true,
       "requires": {
-        "async": "2.5.0"
+        "async": "^2.4.0"
       }
     },
     "asynckit": {
@@ -183,9 +183,9 @@
       "integrity": "sha1-Y/1D99weO7fONZR9uP42mj9Yx0s=",
       "dev": true,
       "requires": {
-        "chalk": "1.1.3",
-        "esutils": "2.0.2",
-        "js-tokens": "3.0.2"
+        "chalk": "^1.1.3",
+        "esutils": "^2.0.2",
+        "js-tokens": "^3.0.2"
       },
       "dependencies": {
         "chalk": {
@@ -194,11 +194,11 @@
           "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
           "dev": true,
           "requires": {
-            "ansi-styles": "2.2.1",
-            "escape-string-regexp": "1.0.5",
-            "has-ansi": "2.0.0",
-            "strip-ansi": "3.0.1",
-            "supports-color": "2.0.0"
+            "ansi-styles": "^2.2.1",
+            "escape-string-regexp": "^1.0.2",
+            "has-ansi": "^2.0.0",
+            "strip-ansi": "^3.0.0",
+            "supports-color": "^2.0.0"
           }
         },
         "strip-ansi": {
@@ -207,7 +207,7 @@
           "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
           "dev": true,
           "requires": {
-            "ansi-regex": "2.1.1"
+            "ansi-regex": "^2.0.0"
           }
         },
         "supports-color": {
@@ -224,25 +224,25 @@
       "integrity": "sha1-rzL3izGm/O8RnIew/Y2XU/A6C7g=",
       "dev": true,
       "requires": {
-        "babel-code-frame": "6.26.0",
-        "babel-generator": "6.26.0",
-        "babel-helpers": "6.24.1",
-        "babel-messages": "6.23.0",
-        "babel-register": "6.26.0",
-        "babel-runtime": "6.26.0",
-        "babel-template": "6.26.0",
-        "babel-traverse": "6.26.0",
-        "babel-types": "6.26.0",
-        "babylon": "6.18.0",
-        "convert-source-map": "1.5.0",
-        "debug": "2.6.8",
-        "json5": "0.5.1",
-        "lodash": "4.17.4",
-        "minimatch": "3.0.4",
-        "path-is-absolute": "1.0.1",
-        "private": "0.1.7",
-        "slash": "1.0.0",
-        "source-map": "0.5.7"
+        "babel-code-frame": "^6.26.0",
+        "babel-generator": "^6.26.0",
+        "babel-helpers": "^6.24.1",
+        "babel-messages": "^6.23.0",
+        "babel-register": "^6.26.0",
+        "babel-runtime": "^6.26.0",
+        "babel-template": "^6.26.0",
+        "babel-traverse": "^6.26.0",
+        "babel-types": "^6.26.0",
+        "babylon": "^6.18.0",
+        "convert-source-map": "^1.5.0",
+        "debug": "^2.6.8",
+        "json5": "^0.5.1",
+        "lodash": "^4.17.4",
+        "minimatch": "^3.0.4",
+        "path-is-absolute": "^1.0.1",
+        "private": "^0.1.7",
+        "slash": "^1.0.0",
+        "source-map": "^0.5.6"
       },
       "dependencies": {
         "debug": {
@@ -262,14 +262,14 @@
       "integrity": "sha1-rBriAHC3n248odMmlhMFN3TyDcU=",
       "dev": true,
       "requires": {
-        "babel-messages": "6.23.0",
-        "babel-runtime": "6.26.0",
-        "babel-types": "6.26.0",
-        "detect-indent": "4.0.0",
-        "jsesc": "1.3.0",
-        "lodash": "4.17.4",
-        "source-map": "0.5.7",
-        "trim-right": "1.0.1"
+        "babel-messages": "^6.23.0",
+        "babel-runtime": "^6.26.0",
+        "babel-types": "^6.26.0",
+        "detect-indent": "^4.0.0",
+        "jsesc": "^1.3.0",
+        "lodash": "^4.17.4",
+        "source-map": "^0.5.6",
+        "trim-right": "^1.0.1"
       },
       "dependencies": {
         "jsesc": {
@@ -286,10 +286,10 @@
       "integrity": "sha1-7Oaqzdx25Bw0YfiL/Fdb0Nqi340=",
       "dev": true,
       "requires": {
-        "babel-helper-hoist-variables": "6.24.1",
-        "babel-runtime": "6.26.0",
-        "babel-traverse": "6.26.0",
-        "babel-types": "6.26.0"
+        "babel-helper-hoist-variables": "^6.24.1",
+        "babel-runtime": "^6.22.0",
+        "babel-traverse": "^6.24.1",
+        "babel-types": "^6.24.1"
       }
     },
     "babel-helper-define-map": {
@@ -298,10 +298,10 @@
       "integrity": "sha1-pfVtq0GiX5fstJjH66ypgZ+Vvl8=",
       "dev": true,
       "requires": {
-        "babel-helper-function-name": "6.24.1",
-        "babel-runtime": "6.26.0",
-        "babel-types": "6.26.0",
-        "lodash": "4.17.4"
+        "babel-helper-function-name": "^6.24.1",
+        "babel-runtime": "^6.26.0",
+        "babel-types": "^6.26.0",
+        "lodash": "^4.17.4"
       }
     },
     "babel-helper-function-name": {
@@ -310,11 +310,11 @@
       "integrity": "sha1-00dbjAPtmCQqJbSDUasYOZ01gKk=",
       "dev": true,
       "requires": {
-        "babel-helper-get-function-arity": "6.24.1",
-        "babel-runtime": "6.26.0",
-        "babel-template": "6.26.0",
-        "babel-traverse": "6.26.0",
-        "babel-types": "6.26.0"
+        "babel-helper-get-function-arity": "^6.24.1",
+        "babel-runtime": "^6.22.0",
+        "babel-template": "^6.24.1",
+        "babel-traverse": "^6.24.1",
+        "babel-types": "^6.24.1"
       }
     },
     "babel-helper-get-function-arity": {
@@ -323,8 +323,8 @@
       "integrity": "sha1-j3eCqpNAfEHTqlCQj4mwMbG2hT0=",
       "dev": true,
       "requires": {
-        "babel-runtime": "6.26.0",
-        "babel-types": "6.26.0"
+        "babel-runtime": "^6.22.0",
+        "babel-types": "^6.24.1"
       }
     },
     "babel-helper-hoist-variables": {
@@ -333,8 +333,8 @@
       "integrity": "sha1-HssnaJydJVE+rbyZFKc/VAi+enY=",
       "dev": true,
       "requires": {
-        "babel-runtime": "6.26.0",
-        "babel-types": "6.26.0"
+        "babel-runtime": "^6.22.0",
+        "babel-types": "^6.24.1"
       }
     },
     "babel-helper-optimise-call-expression": {
@@ -343,8 +343,8 @@
       "integrity": "sha1-96E0J7qfc/j0+pk8VKl4gtEkQlc=",
       "dev": true,
       "requires": {
-        "babel-runtime": "6.26.0",
-        "babel-types": "6.26.0"
+        "babel-runtime": "^6.22.0",
+        "babel-types": "^6.24.1"
       }
     },
     "babel-helper-regex": {
@@ -353,9 +353,9 @@
       "integrity": "sha1-MlxZ+QL4LyS3T6zu0DY5VPZJXnI=",
       "dev": true,
       "requires": {
-        "babel-runtime": "6.26.0",
-        "babel-types": "6.26.0",
-        "lodash": "4.17.4"
+        "babel-runtime": "^6.26.0",
+        "babel-types": "^6.26.0",
+        "lodash": "^4.17.4"
       }
     },
     "babel-helper-replace-supers": {
@@ -364,12 +364,12 @@
       "integrity": "sha1-v22/5Dk40XNpohPKiov3S2qQqxo=",
       "dev": true,
       "requires": {
-        "babel-helper-optimise-call-expression": "6.24.1",
-        "babel-messages": "6.23.0",
-        "babel-runtime": "6.26.0",
-        "babel-template": "6.26.0",
-        "babel-traverse": "6.26.0",
-        "babel-types": "6.26.0"
+        "babel-helper-optimise-call-expression": "^6.24.1",
+        "babel-messages": "^6.23.0",
+        "babel-runtime": "^6.22.0",
+        "babel-template": "^6.24.1",
+        "babel-traverse": "^6.24.1",
+        "babel-types": "^6.24.1"
       }
     },
     "babel-helpers": {
@@ -378,8 +378,8 @@
       "integrity": "sha1-NHHenK7DiOXIUOWX5Yom3fN2ArI=",
       "dev": true,
       "requires": {
-        "babel-runtime": "6.26.0",
-        "babel-template": "6.26.0"
+        "babel-runtime": "^6.22.0",
+        "babel-template": "^6.24.1"
       }
     },
     "babel-messages": {
@@ -388,7 +388,7 @@
       "integrity": "sha1-8830cDhYA1sqKVHG7F7fbGLyYw4=",
       "dev": true,
       "requires": {
-        "babel-runtime": "6.26.0"
+        "babel-runtime": "^6.22.0"
       }
     },
     "babel-plugin-check-es2015-constants": {
@@ -397,7 +397,7 @@
       "integrity": "sha1-NRV7EBQm/S/9PaP3XH0ekYNbv4o=",
       "dev": true,
       "requires": {
-        "babel-runtime": "6.26.0"
+        "babel-runtime": "^6.22.0"
       }
     },
     "babel-plugin-transform-es2015-arrow-functions": {
@@ -406,7 +406,7 @@
       "integrity": "sha1-RSaSy3EdX3ncf4XkQM5BufJE0iE=",
       "dev": true,
       "requires": {
-        "babel-runtime": "6.26.0"
+        "babel-runtime": "^6.22.0"
       }
     },
     "babel-plugin-transform-es2015-block-scoped-functions": {
@@ -415,7 +415,7 @@
       "integrity": "sha1-u8UbSflk1wy42OC5ToICRs46YUE=",
       "dev": true,
       "requires": {
-        "babel-runtime": "6.26.0"
+        "babel-runtime": "^6.22.0"
       }
     },
     "babel-plugin-transform-es2015-block-scoping": {
@@ -424,11 +424,11 @@
       "integrity": "sha1-1w9SmcEwjQXBL0Y4E7CgnnOxiV8=",
       "dev": true,
       "requires": {
-        "babel-runtime": "6.26.0",
-        "babel-template": "6.26.0",
-        "babel-traverse": "6.26.0",
-        "babel-types": "6.26.0",
-        "lodash": "4.17.4"
+        "babel-runtime": "^6.26.0",
+        "babel-template": "^6.26.0",
+        "babel-traverse": "^6.26.0",
+        "babel-types": "^6.26.0",
+        "lodash": "^4.17.4"
       }
     },
     "babel-plugin-transform-es2015-classes": {
@@ -437,15 +437,15 @@
       "integrity": "sha1-WkxYpQyclGHlZLSyo7+ryXolhNs=",
       "dev": true,
       "requires": {
-        "babel-helper-define-map": "6.26.0",
-        "babel-helper-function-name": "6.24.1",
-        "babel-helper-optimise-call-expression": "6.24.1",
-        "babel-helper-replace-supers": "6.24.1",
-        "babel-messages": "6.23.0",
-        "babel-runtime": "6.26.0",
-        "babel-template": "6.26.0",
-        "babel-traverse": "6.26.0",
-        "babel-types": "6.26.0"
+        "babel-helper-define-map": "^6.24.1",
+        "babel-helper-function-name": "^6.24.1",
+        "babel-helper-optimise-call-expression": "^6.24.1",
+        "babel-helper-replace-supers": "^6.24.1",
+        "babel-messages": "^6.23.0",
+        "babel-runtime": "^6.22.0",
+        "babel-template": "^6.24.1",
+        "babel-traverse": "^6.24.1",
+        "babel-types": "^6.24.1"
       }
     },
     "babel-plugin-transform-es2015-computed-properties": {
@@ -454,8 +454,8 @@
       "integrity": "sha1-b+Ko0WiV1WNPTNmZttNICjCBWbM=",
       "dev": true,
       "requires": {
-        "babel-runtime": "6.26.0",
-        "babel-template": "6.26.0"
+        "babel-runtime": "^6.22.0",
+        "babel-template": "^6.24.1"
       }
     },
     "babel-plugin-transform-es2015-destructuring": {
@@ -464,7 +464,7 @@
       "integrity": "sha1-mXux8auWf2gtKwh2/jWNYOdlxW0=",
       "dev": true,
       "requires": {
-        "babel-runtime": "6.26.0"
+        "babel-runtime": "^6.22.0"
       }
     },
     "babel-plugin-transform-es2015-duplicate-keys": {
@@ -473,8 +473,8 @@
       "integrity": "sha1-c+s9MQypaePvnskcU3QabxV2Qj4=",
       "dev": true,
       "requires": {
-        "babel-runtime": "6.26.0",
-        "babel-types": "6.26.0"
+        "babel-runtime": "^6.22.0",
+        "babel-types": "^6.24.1"
       }
     },
     "babel-plugin-transform-es2015-for-of": {
@@ -483,7 +483,7 @@
       "integrity": "sha1-9HyVsrYT3x0+zC/bdXNiPHUkhpE=",
       "dev": true,
       "requires": {
-        "babel-runtime": "6.26.0"
+        "babel-runtime": "^6.22.0"
       }
     },
     "babel-plugin-transform-es2015-function-name": {
@@ -492,9 +492,9 @@
       "integrity": "sha1-g0yJhTvDaxrw86TF26qU/Y6sqos=",
       "dev": true,
       "requires": {
-        "babel-helper-function-name": "6.24.1",
-        "babel-runtime": "6.26.0",
-        "babel-types": "6.26.0"
+        "babel-helper-function-name": "^6.24.1",
+        "babel-runtime": "^6.22.0",
+        "babel-types": "^6.24.1"
       }
     },
     "babel-plugin-transform-es2015-literals": {
@@ -503,7 +503,7 @@
       "integrity": "sha1-T1SgLWzWbPkVKAAZox0xklN3yi4=",
       "dev": true,
       "requires": {
-        "babel-runtime": "6.26.0"
+        "babel-runtime": "^6.22.0"
       }
     },
     "babel-plugin-transform-es2015-modules-amd": {
@@ -512,9 +512,9 @@
       "integrity": "sha1-Oz5UAXI5hC1tGcMBHEvS8AoA0VQ=",
       "dev": true,
       "requires": {
-        "babel-plugin-transform-es2015-modules-commonjs": "6.26.0",
-        "babel-runtime": "6.26.0",
-        "babel-template": "6.26.0"
+        "babel-plugin-transform-es2015-modules-commonjs": "^6.24.1",
+        "babel-runtime": "^6.22.0",
+        "babel-template": "^6.24.1"
       }
     },
     "babel-plugin-transform-es2015-modules-commonjs": {
@@ -523,10 +523,10 @@
       "integrity": "sha1-DYOUApt9xqvhqX7xgeAHWN0uXYo=",
       "dev": true,
       "requires": {
-        "babel-plugin-transform-strict-mode": "6.24.1",
-        "babel-runtime": "6.26.0",
-        "babel-template": "6.26.0",
-        "babel-types": "6.26.0"
+        "babel-plugin-transform-strict-mode": "^6.24.1",
+        "babel-runtime": "^6.26.0",
+        "babel-template": "^6.26.0",
+        "babel-types": "^6.26.0"
       }
     },
     "babel-plugin-transform-es2015-modules-systemjs": {
@@ -535,9 +535,9 @@
       "integrity": "sha1-/4mhQrkRmpBhlfXxBuzzBdlAfSM=",
       "dev": true,
       "requires": {
-        "babel-helper-hoist-variables": "6.24.1",
-        "babel-runtime": "6.26.0",
-        "babel-template": "6.26.0"
+        "babel-helper-hoist-variables": "^6.24.1",
+        "babel-runtime": "^6.22.0",
+        "babel-template": "^6.24.1"
       }
     },
     "babel-plugin-transform-es2015-modules-umd": {
@@ -546,9 +546,9 @@
       "integrity": "sha1-rJl+YoXNGO1hdq22B9YCNErThGg=",
       "dev": true,
       "requires": {
-        "babel-plugin-transform-es2015-modules-amd": "6.24.1",
-        "babel-runtime": "6.26.0",
-        "babel-template": "6.26.0"
+        "babel-plugin-transform-es2015-modules-amd": "^6.24.1",
+        "babel-runtime": "^6.22.0",
+        "babel-template": "^6.24.1"
       }
     },
     "babel-plugin-transform-es2015-object-super": {
@@ -557,8 +557,8 @@
       "integrity": "sha1-JM72muIcuDp/hgPa0CH1cusnj40=",
       "dev": true,
       "requires": {
-        "babel-helper-replace-supers": "6.24.1",
-        "babel-runtime": "6.26.0"
+        "babel-helper-replace-supers": "^6.24.1",
+        "babel-runtime": "^6.22.0"
       }
     },
     "babel-plugin-transform-es2015-parameters": {
@@ -567,12 +567,12 @@
       "integrity": "sha1-V6w1GrScrxSpfNE7CfZv3wpiXys=",
       "dev": true,
       "requires": {
-        "babel-helper-call-delegate": "6.24.1",
-        "babel-helper-get-function-arity": "6.24.1",
-        "babel-runtime": "6.26.0",
-        "babel-template": "6.26.0",
-        "babel-traverse": "6.26.0",
-        "babel-types": "6.26.0"
+        "babel-helper-call-delegate": "^6.24.1",
+        "babel-helper-get-function-arity": "^6.24.1",
+        "babel-runtime": "^6.22.0",
+        "babel-template": "^6.24.1",
+        "babel-traverse": "^6.24.1",
+        "babel-types": "^6.24.1"
       }
     },
     "babel-plugin-transform-es2015-shorthand-properties": {
@@ -581,8 +581,8 @@
       "integrity": "sha1-JPh11nIch2YbvZmkYi5R8U3jiqA=",
       "dev": true,
       "requires": {
-        "babel-runtime": "6.26.0",
-        "babel-types": "6.26.0"
+        "babel-runtime": "^6.22.0",
+        "babel-types": "^6.24.1"
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-        "xhr": "2.4.0",
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@@ -4464,9 +4377,9 @@
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       }
@@ -4483,7 +4396,7 @@
       "integrity": "sha512-xcJpopdamTuY5duC/KnTTNBraPK54YwpenP4lzxU8H91GudWpFv38u0CKjclE1Wi2EH2EDz5LRcHcKbCIzqGyg==",
       "dev": true,
       "requires": {
-        "isexe": "2.0.0"
+        "isexe": "^2.0.0"
       }
     },
     "which-module": {
@@ -4498,7 +4411,7 @@
       "integrity": "sha512-ijDLlyQ7s6x1JgCLur53osjm/UXUYD9+0PbYKrBsYisYXzCxN+HC3mYDNy/dWdmf3AwqwU3CXwDCvsNgGK1S0w==",
       "dev": true,
       "requires": {
-        "string-width": "1.0.2"
+        "string-width": "^1.0.2"
       },
       "dependencies": {
         "is-fullwidth-code-point": {
@@ -4507,7 +4420,7 @@
           "integrity": "sha1-754xOG8DGn8NZDr4L95QxFfvAMs=",
           "dev": true,
           "requires": {
-            "number-is-nan": "1.0.1"
+            "number-is-nan": "^1.0.0"
           }
         },
         "string-width": {
@@ -4516,9 +4429,9 @@
           "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
           "dev": true,
           "requires": {
-            "code-point-at": "1.1.0",
-            "is-fullwidth-code-point": "1.0.0",
-            "strip-ansi": "3.0.1"
+            "code-point-at": "^1.0.0",
+            "is-fullwidth-code-point": "^1.0.0",
+            "strip-ansi": "^3.0.0"
           }
         },
         "strip-ansi": {
@@ -4527,7 +4440,7 @@
           "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
           "dev": true,
           "requires": {
-            "ansi-regex": "2.1.1"
+            "ansi-regex": "^2.0.0"
           }
         }
       }
@@ -4550,8 +4463,8 @@
       "integrity": "sha1-2Pw9KE3QV5T+hJc8rs3Rz4JP3YU=",
       "dev": true,
       "requires": {
-        "string-width": "1.0.2",
-        "strip-ansi": "3.0.1"
+        "string-width": "^1.0.1",
+        "strip-ansi": "^3.0.1"
       },
       "dependencies": {
         "is-fullwidth-code-point": {
@@ -4560,7 +4473,7 @@
           "integrity": "sha1-754xOG8DGn8NZDr4L95QxFfvAMs=",
           "dev": true,
           "requires": {
-            "number-is-nan": "1.0.1"
+            "number-is-nan": "^1.0.0"
           }
         },
         "string-width": {
@@ -4569,9 +4482,9 @@
           "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
           "dev": true,
           "requires": {
-            "code-point-at": "1.1.0",
-            "is-fullwidth-code-point": "1.0.0",
-            "strip-ansi": "3.0.1"
+            "code-point-at": "^1.0.0",
+            "is-fullwidth-code-point": "^1.0.0",
+            "strip-ansi": "^3.0.0"
           }
         },
         "strip-ansi": {
@@ -4580,7 +4493,7 @@
           "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
           "dev": true,
           "requires": {
-            "ansi-regex": "2.1.1"
+            "ansi-regex": "^2.0.0"
           }
         }
       }
@@ -4596,7 +4509,7 @@
       "integrity": "sha1-X8A4KOJkzqP+kUVUdvejxWbLB1c=",
       "dev": true,
       "requires": {
-        "mkdirp": "0.5.1"
+        "mkdirp": "^0.5.1"
       }
     },
     "xhr": {
@@ -4605,10 +4518,10 @@
       "integrity": "sha1-4W5mpF+GmGHu76tBbV7/ci3ECZM=",
       "dev": true,
       "requires": {
-        "global": "4.3.2",
-        "is-function": "1.0.1",
-        "parse-headers": "2.0.1",
-        "xtend": "4.0.1"
+        "global": "~4.3.0",
+        "is-function": "^1.0.1",
+        "parse-headers": "^2.0.0",
+        "xtend": "^4.0.0"
       }
     },
     "xhr2": {
@@ -4647,20 +4560,20 @@
       "integrity": "sha1-wMQpJMpKqmsObaFznfshZDn53cA=",
       "dev": true,
       "requires": {
-        "cliui": "3.2.0",
-        "decamelize": "1.2.0",
-        "get-caller-file": "1.0.2",
-        "lodash.assign": "4.2.0",
-        "os-locale": "1.4.0",
-        "read-pkg-up": "1.0.1",
-        "require-directory": "2.1.1",
-        "require-main-filename": "1.0.1",
-        "set-blocking": "2.0.0",
-        "string-width": "1.0.2",
-        "which-module": "1.0.0",
-        "window-size": "0.2.0",
-        "y18n": "3.2.1",
-        "yargs-parser": "2.4.1"
+        "cliui": "^3.2.0",
+        "decamelize": "^1.1.1",
+        "get-caller-file": "^1.0.1",
+        "lodash.assign": "^4.0.3",
+        "os-locale": "^1.4.0",
+        "read-pkg-up": "^1.0.1",
+        "require-directory": "^2.1.1",
+        "require-main-filename": "^1.0.1",
+        "set-blocking": "^2.0.0",
+        "string-width": "^1.0.1",
+        "which-module": "^1.0.0",
+        "window-size": "^0.2.0",
+        "y18n": "^3.2.1",
+        "yargs-parser": "^2.4.1"
       },
       "dependencies": {
         "is-fullwidth-code-point": {
@@ -4669,7 +4582,7 @@
           "integrity": "sha1-754xOG8DGn8NZDr4L95QxFfvAMs=",
           "dev": true,
           "requires": {
-            "number-is-nan": "1.0.1"
+            "number-is-nan": "^1.0.0"
           }
         },
         "string-width": {
@@ -4678,9 +4591,9 @@
           "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
           "dev": true,
           "requires": {
-            "code-point-at": "1.1.0",
-            "is-fullwidth-code-point": "1.0.0",
-            "strip-ansi": "3.0.1"
+            "code-point-at": "^1.0.0",
+            "is-fullwidth-code-point": "^1.0.0",
+            "strip-ansi": "^3.0.0"
           }
         },
         "strip-ansi": {
@@ -4689,7 +4602,7 @@
           "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
           "dev": true,
           "requires": {
-            "ansi-regex": "2.1.1"
+            "ansi-regex": "^2.0.0"
           }
         }
       }
@@ -4700,8 +4613,8 @@
       "integrity": "sha1-hVaN488VD/SfpRgl8DqMiA3cxcQ=",
       "dev": true,
       "requires": {
-        "camelcase": "3.0.0",
-        "lodash.assign": "4.2.0"
+        "camelcase": "^3.0.0",
+        "lodash.assign": "^4.0.6"
       }
     },
     "zeppelin-solidity": {
diff --git a/package.json b/package.json
index 31f02f5..4c059e8 100644
--- a/package.json
+++ b/package.json
@@ -26,11 +26,11 @@
   "author": "Valery Aligorsky <stdammit@gmail.com>",
   "license": "BSD-2-Clause",
   "dependencies": {
-    "bluebird": "^3.5.0",
-    "cli-color": "^1.2.0",
-    "commander": "^2.11.0",
-    "debug": "^3.0.1",
-    "fs-extra": "^4.0.2",
+    "bluebird": "^3.5.3",
+    "cli-color": "^1.4.0",
+    "commander": "^2.19.0",
+    "debug": "^3.2.6",
+    "fs-extra": "^7.0.1",
     "glob": "^7.1.2"
   },
   "pre-commit": [
@@ -43,7 +43,7 @@
   "devDependencies": {
     "chai": "^4.1.2",
     "eslint": "^4.6.1",
-    "mocha": "^3.5.2",
+    "mocha": "^5.2.0",
     "zeppelin-solidity": "^1.2.0"
   }
 }
diff --git a/test/index.js b/test/index.js
index a73da7d..0cb9f1f 100644
--- a/test/index.js
+++ b/test/index.js
@@ -27,7 +27,6 @@ describe('Solidity Merger', () => {
     let result = await merger.processFile(file, true);
 
     assertWithFile(result, 'MultiImports.sol');
-
   });
 
 });