diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..a4e8799
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,1073 @@
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+              "optional": true,
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+                  "optional": true
+                }
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+              "bundled": true,
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+                  "dependencies": {
+                    "punycode": {
+                      "version": "1.4.1",
+                      "bundled": true,
+                      "optional": true
+                    }
+                  }
+                },
+                "tunnel-agent": {
+                  "version": "0.4.3",
+                  "bundled": true,
+                  "optional": true
+                },
+                "uuid": {
+                  "version": "3.0.1",
+                  "bundled": true,
+                  "optional": true
+                }
+              }
+            },
+            "rimraf": {
+              "version": "2.5.4",
+              "bundled": true,
+              "requires": {
+                "glob": "^7.0.5"
+              },
+              "dependencies": {
+                "glob": {
+                  "version": "7.1.1",
+                  "bundled": true,
+                  "requires": {
+                    "fs.realpath": "^1.0.0",
+                    "inflight": "^1.0.4",
+                    "inherits": "2",
+                    "minimatch": "^3.0.2",
+                    "once": "^1.3.0",
+                    "path-is-absolute": "^1.0.0"
+                  },
+                  "dependencies": {
+                    "fs.realpath": {
+                      "version": "1.0.0",
+                      "bundled": true
+                    },
+                    "inflight": {
+                      "version": "1.0.6",
+                      "bundled": true,
+                      "requires": {
+                        "once": "^1.3.0",
+                        "wrappy": "1"
+                      },
+                      "dependencies": {
+                        "wrappy": {
+                          "version": "1.0.2",
+                          "bundled": true
+                        }
+                      }
+                    },
+                    "inherits": {
+                      "version": "2.0.3",
+                      "bundled": true
+                    },
+                    "minimatch": {
+                      "version": "3.0.3",
+                      "bundled": true,
+                      "requires": {
+                        "brace-expansion": "^1.0.0"
+                      },
+                      "dependencies": {
+                        "brace-expansion": {
+                          "version": "1.1.6",
+                          "bundled": true,
+                          "requires": {
+                            "balanced-match": "^0.4.1",
+                            "concat-map": "0.0.1"
+                          },
+                          "dependencies": {
+                            "balanced-match": {
+                              "version": "0.4.2",
+                              "bundled": true
+                            },
+                            "concat-map": {
+                              "version": "0.0.1",
+                              "bundled": true
+                            }
+                          }
+                        }
+                      }
+                    },
+                    "once": {
+                      "version": "1.4.0",
+                      "bundled": true,
+                      "requires": {
+                        "wrappy": "1"
+                      },
+                      "dependencies": {
+                        "wrappy": {
+                          "version": "1.0.2",
+                          "bundled": true
+                        }
+                      }
+                    },
+                    "path-is-absolute": {
+                      "version": "1.0.1",
+                      "bundled": true
+                    }
+                  }
+                }
+              }
+            },
+            "semver": {
+              "version": "5.3.0",
+              "bundled": true,
+              "optional": true
+            },
+            "tar": {
+              "version": "2.2.1",
+              "bundled": true,
+              "requires": {
+                "block-stream": "*",
+                "fstream": "^1.0.2",
+                "inherits": "2"
+              },
+              "dependencies": {
+                "block-stream": {
+                  "version": "0.0.9",
+                  "bundled": true,
+                  "requires": {
+                    "inherits": "~2.0.0"
+                  }
+                },
+                "fstream": {
+                  "version": "1.0.10",
+                  "bundled": true,
+                  "requires": {
+                    "graceful-fs": "^4.1.2",
+                    "inherits": "~2.0.0",
+                    "mkdirp": ">=0.5 0",
+                    "rimraf": "2"
+                  },
+                  "dependencies": {
+                    "graceful-fs": {
+                      "version": "4.1.11",
+                      "bundled": true
+                    }
+                  }
+                },
+                "inherits": {
+                  "version": "2.0.3",
+                  "bundled": true
+                }
+              }
+            },
+            "tar-pack": {
+              "version": "3.3.0",
+              "bundled": true,
+              "optional": true,
+              "requires": {
+                "debug": "~2.2.0",
+                "fstream": "~1.0.10",
+                "fstream-ignore": "~1.0.5",
+                "once": "~1.3.3",
+                "readable-stream": "~2.1.4",
+                "rimraf": "~2.5.1",
+                "tar": "~2.2.1",
+                "uid-number": "~0.0.6"
+              },
+              "dependencies": {
+                "debug": {
+                  "version": "2.2.0",
+                  "bundled": true,
+                  "optional": true,
+                  "requires": {
+                    "ms": "0.7.1"
+                  },
+                  "dependencies": {
+                    "ms": {
+                      "version": "0.7.1",
+                      "bundled": true,
+                      "optional": true
+                    }
+                  }
+                },
+                "fstream": {
+                  "version": "1.0.10",
+                  "bundled": true,
+                  "requires": {
+                    "graceful-fs": "^4.1.2",
+                    "inherits": "~2.0.0",
+                    "mkdirp": ">=0.5 0",
+                    "rimraf": "2"
+                  },
+                  "dependencies": {
+                    "graceful-fs": {
+                      "version": "4.1.11",
+                      "bundled": true
+                    },
+                    "inherits": {
+                      "version": "2.0.3",
+                      "bundled": true
+                    }
+                  }
+                },
+                "fstream-ignore": {
+                  "version": "1.0.5",
+                  "bundled": true,
+                  "optional": true,
+                  "requires": {
+                    "fstream": "^1.0.0",
+                    "inherits": "2",
+                    "minimatch": "^3.0.0"
+                  },
+                  "dependencies": {
+                    "inherits": {
+                      "version": "2.0.3",
+                      "bundled": true,
+                      "optional": true
+                    },
+                    "minimatch": {
+                      "version": "3.0.3",
+                      "bundled": true,
+                      "optional": true,
+                      "requires": {
+                        "brace-expansion": "^1.0.0"
+                      },
+                      "dependencies": {
+                        "brace-expansion": {
+                          "version": "1.1.6",
+                          "bundled": true,
+                          "optional": true,
+                          "requires": {
+                            "balanced-match": "^0.4.1",
+                            "concat-map": "0.0.1"
+                          },
+                          "dependencies": {
+                            "balanced-match": {
+                              "version": "0.4.2",
+                              "bundled": true,
+                              "optional": true
+                            },
+                            "concat-map": {
+                              "version": "0.0.1",
+                              "bundled": true,
+                              "optional": true
+                            }
+                          }
+                        }
+                      }
+                    }
+                  }
+                },
+                "once": {
+                  "version": "1.3.3",
+                  "bundled": true,
+                  "optional": true,
+                  "requires": {
+                    "wrappy": "1"
+                  },
+                  "dependencies": {
+                    "wrappy": {
+                      "version": "1.0.2",
+                      "bundled": true,
+                      "optional": true
+                    }
+                  }
+                },
+                "readable-stream": {
+                  "version": "2.1.5",
+                  "bundled": true,
+                  "optional": true,
+                  "requires": {
+                    "buffer-shims": "^1.0.0",
+                    "core-util-is": "~1.0.0",
+                    "inherits": "~2.0.1",
+                    "isarray": "~1.0.0",
+                    "process-nextick-args": "~1.0.6",
+                    "string_decoder": "~0.10.x",
+                    "util-deprecate": "~1.0.1"
+                  },
+                  "dependencies": {
+                    "buffer-shims": {
+                      "version": "1.0.0",
+                      "bundled": true,
+                      "optional": true
+                    },
+                    "core-util-is": {
+                      "version": "1.0.2",
+                      "bundled": true,
+                      "optional": true
+                    },
+                    "inherits": {
+                      "version": "2.0.3",
+                      "bundled": true,
+                      "optional": true
+                    },
+                    "isarray": {
+                      "version": "1.0.0",
+                      "bundled": true,
+                      "optional": true
+                    },
+                    "process-nextick-args": {
+                      "version": "1.0.7",
+                      "bundled": true,
+                      "optional": true
+                    },
+                    "string_decoder": {
+                      "version": "0.10.31",
+                      "bundled": true,
+                      "optional": true
+                    },
+                    "util-deprecate": {
+                      "version": "1.0.2",
+                      "bundled": true,
+                      "optional": true
+                    }
+                  }
+                },
+                "uid-number": {
+                  "version": "0.0.6",
+                  "bundled": true,
+                  "optional": true
+                }
+              }
+            }
+          }
+        }
+      }
+    }
+  }
+}
diff --git a/package.json b/package.json
index a67558d..8b8535a 100644
--- a/package.json
+++ b/package.json
@@ -27,18 +27,18 @@
       "url": "http://github.com/julien-c/epub/blob/master/LICENSE"
     }
   ],
-  "dependencies": {
-    "adm-zip": "^0.4.4",
-    "xml2js": "^0.4.4"
-  },
-  "optionalDependencies": {
-    "zipfile": "^0.5.0"
-  },
   "engine": [
     "node >=0.3.0"
   ],
   "keywords": [
     "epub",
     "books"
-  ]
+  ],
+  "dependencies": {
+    "adm-zip": "^0.4.11",
+    "xml2js": "^0.4.19"
+  },
+  "optionalDependencies": {
+    "zipfile": "^0.5.11"
+  }
 }