diff --git a/npm-shrinkwrap.json b/npm-shrinkwrap.json
deleted file mode 100644
index 91da22d..0000000
--- a/npm-shrinkwrap.json
+++ /dev/null
@@ -1,401 +0,0 @@
-{
-  "name": "chef-api",
-  "version": "0.6.0",
-  "dependencies": {
-    "lodash": {
-      "version": "2.4.2",
-      "from": "lodash@^2.2.1",
-      "resolved": "https://registry.npmjs.org/lodash/-/lodash-2.4.2.tgz"
-    },
-    "request": {
-      "version": "2.67.0",
-      "from": "http://registry.npmjs.org/request/-/request-2.67.0.tgz",
-      "resolved": "http://registry.npmjs.org/request/-/request-2.67.0.tgz",
-      "dependencies": {
-        "bl": {
-          "version": "1.0.0",
-          "from": "https://registry.npmjs.org/bl/-/bl-1.0.0.tgz",
-          "resolved": "https://registry.npmjs.org/bl/-/bl-1.0.0.tgz",
-          "dependencies": {
-            "readable-stream": {
-              "version": "2.0.4",
-              "from": "http://registry.npmjs.org/readable-stream/-/readable-stream-2.0.4.tgz",
-              "resolved": "http://registry.npmjs.org/readable-stream/-/readable-stream-2.0.4.tgz",
-              "dependencies": {
-                "core-util-is": {
-                  "version": "1.0.2",
-                  "from": "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.2.tgz",
-                  "resolved": "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.2.tgz"
-                },
-                "inherits": {
-                  "version": "2.0.1",
-                  "from": "https://registry.npmjs.org/inherits/-/inherits-2.0.1.tgz",
-                  "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.1.tgz"
-                },
-                "isarray": {
-                  "version": "0.0.1",
-                  "from": "https://registry.npmjs.org/isarray/-/isarray-0.0.1.tgz",
-                  "resolved": "https://registry.npmjs.org/isarray/-/isarray-0.0.1.tgz"
-                },
-                "process-nextick-args": {
-                  "version": "1.0.6",
-                  "from": "http://registry.npmjs.org/process-nextick-args/-/process-nextick-args-1.0.6.tgz",
-                  "resolved": "http://registry.npmjs.org/process-nextick-args/-/process-nextick-args-1.0.6.tgz"
-                },
-                "string_decoder": {
-                  "version": "0.10.31",
-                  "from": "https://registry.npmjs.org/string_decoder/-/string_decoder-0.10.31.tgz",
-                  "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-0.10.31.tgz"
-                },
-                "util-deprecate": {
-                  "version": "1.0.2",
-                  "from": "http://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
-                  "resolved": "http://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz"
-                }
-              }
-            }
-          }
-        },
-        "caseless": {
-          "version": "0.11.0",
-          "from": "https://registry.npmjs.org/caseless/-/caseless-0.11.0.tgz",
-          "resolved": "https://registry.npmjs.org/caseless/-/caseless-0.11.0.tgz"
-        },
-        "extend": {
-          "version": "3.0.0",
-          "from": "https://registry.npmjs.org/extend/-/extend-3.0.0.tgz",
-          "resolved": "https://registry.npmjs.org/extend/-/extend-3.0.0.tgz"
-        },
-        "forever-agent": {
-          "version": "0.6.1",
-          "from": "https://registry.npmjs.org/forever-agent/-/forever-agent-0.6.1.tgz",
-          "resolved": "https://registry.npmjs.org/forever-agent/-/forever-agent-0.6.1.tgz"
-        },
-        "form-data": {
-          "version": "1.0.0-rc3",
-          "from": "https://registry.npmjs.org/form-data/-/form-data-1.0.0-rc3.tgz",
-          "resolved": "https://registry.npmjs.org/form-data/-/form-data-1.0.0-rc3.tgz",
-          "dependencies": {
-            "async": {
-              "version": "1.5.0",
-              "from": "http://registry.npmjs.org/async/-/async-1.5.0.tgz",
-              "resolved": "http://registry.npmjs.org/async/-/async-1.5.0.tgz"
-            }
-          }
-        },
-        "json-stringify-safe": {
-          "version": "5.0.1",
-          "from": "https://registry.npmjs.org/json-stringify-safe/-/json-stringify-safe-5.0.1.tgz",
-          "resolved": "https://registry.npmjs.org/json-stringify-safe/-/json-stringify-safe-5.0.1.tgz"
-        },
-        "mime-types": {
-          "version": "2.1.8",
-          "from": "http://registry.npmjs.org/mime-types/-/mime-types-2.1.8.tgz",
-          "resolved": "http://registry.npmjs.org/mime-types/-/mime-types-2.1.8.tgz",
-          "dependencies": {
-            "mime-db": {
-              "version": "1.20.0",
-              "from": "http://registry.npmjs.org/mime-db/-/mime-db-1.20.0.tgz",
-              "resolved": "http://registry.npmjs.org/mime-db/-/mime-db-1.20.0.tgz"
-            }
-          }
-        },
-        "node-uuid": {
-          "version": "1.4.7",
-          "from": "https://registry.npmjs.org/node-uuid/-/node-uuid-1.4.7.tgz",
-          "resolved": "https://registry.npmjs.org/node-uuid/-/node-uuid-1.4.7.tgz"
-        },
-        "qs": {
-          "version": "5.2.0",
-          "from": "http://registry.npmjs.org/qs/-/qs-5.2.0.tgz",
-          "resolved": "http://registry.npmjs.org/qs/-/qs-5.2.0.tgz"
-        },
-        "tunnel-agent": {
-          "version": "0.4.2",
-          "from": "http://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.4.2.tgz",
-          "resolved": "http://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.4.2.tgz"
-        },
-        "tough-cookie": {
-          "version": "2.2.1",
-          "from": "http://registry.npmjs.org/tough-cookie/-/tough-cookie-2.2.1.tgz",
-          "resolved": "http://registry.npmjs.org/tough-cookie/-/tough-cookie-2.2.1.tgz"
-        },
-        "http-signature": {
-          "version": "1.1.0",
-          "from": "http://registry.npmjs.org/http-signature/-/http-signature-1.1.0.tgz",
-          "resolved": "http://registry.npmjs.org/http-signature/-/http-signature-1.1.0.tgz",
-          "dependencies": {
-            "assert-plus": {
-              "version": "0.1.5",
-              "from": "https://registry.npmjs.org/assert-plus/-/assert-plus-0.1.5.tgz",
-              "resolved": "https://registry.npmjs.org/assert-plus/-/assert-plus-0.1.5.tgz"
-            },
-            "jsprim": {
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-              "from": "http://registry.npmjs.org/jsprim/-/jsprim-1.2.2.tgz",
-              "resolved": "http://registry.npmjs.org/jsprim/-/jsprim-1.2.2.tgz",
-              "dependencies": {
-                "extsprintf": {
-                  "version": "1.0.2",
-                  "from": "http://registry.npmjs.org/extsprintf/-/extsprintf-1.0.2.tgz",
-                  "resolved": "http://registry.npmjs.org/extsprintf/-/extsprintf-1.0.2.tgz"
-                },
-                "json-schema": {
-                  "version": "0.2.2",
-                  "from": "http://registry.npmjs.org/json-schema/-/json-schema-0.2.2.tgz",
-                  "resolved": "http://registry.npmjs.org/json-schema/-/json-schema-0.2.2.tgz"
-                },
-                "verror": {
-                  "version": "1.3.6",
-                  "from": "http://registry.npmjs.org/verror/-/verror-1.3.6.tgz",
-                  "resolved": "http://registry.npmjs.org/verror/-/verror-1.3.6.tgz"
-                }
-              }
-            },
-            "sshpk": {
-              "version": "1.7.1",
-              "from": "http://registry.npmjs.org/sshpk/-/sshpk-1.7.1.tgz",
-              "resolved": "http://registry.npmjs.org/sshpk/-/sshpk-1.7.1.tgz",
-              "dependencies": {
-                "asn1": {
-                  "version": "0.2.3",
-                  "from": "http://registry.npmjs.org/asn1/-/asn1-0.2.3.tgz",
-                  "resolved": "http://registry.npmjs.org/asn1/-/asn1-0.2.3.tgz"
-                },
-                "assert-plus": {
-                  "version": "0.2.0",
-                  "from": "http://registry.npmjs.org/assert-plus/-/assert-plus-0.2.0.tgz",
-                  "resolved": "http://registry.npmjs.org/assert-plus/-/assert-plus-0.2.0.tgz"
-                },
-                "dashdash": {
-                  "version": "1.10.1",
-                  "from": "http://registry.npmjs.org/dashdash/-/dashdash-1.10.1.tgz",
-                  "resolved": "http://registry.npmjs.org/dashdash/-/dashdash-1.10.1.tgz",
-                  "dependencies": {
-                    "assert-plus": {
-                      "version": "0.1.5",
-                      "from": "https://registry.npmjs.org/assert-plus/-/assert-plus-0.1.5.tgz",
-                      "resolved": "https://registry.npmjs.org/assert-plus/-/assert-plus-0.1.5.tgz"
-                    }
-                  }
-                },
-                "jsbn": {
-                  "version": "0.1.0",
-                  "from": "http://registry.npmjs.org/jsbn/-/jsbn-0.1.0.tgz",
-                  "resolved": "http://registry.npmjs.org/jsbn/-/jsbn-0.1.0.tgz"
-                },
-                "tweetnacl": {
-                  "version": "0.13.2",
-                  "from": "http://registry.npmjs.org/tweetnacl/-/tweetnacl-0.13.2.tgz",
-                  "resolved": "http://registry.npmjs.org/tweetnacl/-/tweetnacl-0.13.2.tgz"
-                },
-                "jodid25519": {
-                  "version": "1.0.2",
-                  "from": "http://registry.npmjs.org/jodid25519/-/jodid25519-1.0.2.tgz",
-                  "resolved": "http://registry.npmjs.org/jodid25519/-/jodid25519-1.0.2.tgz"
-                },
-                "ecc-jsbn": {
-                  "version": "0.1.1",
-                  "from": "http://registry.npmjs.org/ecc-jsbn/-/ecc-jsbn-0.1.1.tgz",
-                  "resolved": "http://registry.npmjs.org/ecc-jsbn/-/ecc-jsbn-0.1.1.tgz"
-                }
-              }
-            }
-          }
-        },
-        "oauth-sign": {
-          "version": "0.8.0",
-          "from": "https://registry.npmjs.org/oauth-sign/-/oauth-sign-0.8.0.tgz",
-          "resolved": "https://registry.npmjs.org/oauth-sign/-/oauth-sign-0.8.0.tgz"
-        },
-        "hawk": {
-          "version": "3.1.2",
-          "from": "http://registry.npmjs.org/hawk/-/hawk-3.1.2.tgz",
-          "resolved": "http://registry.npmjs.org/hawk/-/hawk-3.1.2.tgz",
-          "dependencies": {
-            "hoek": {
-              "version": "2.16.3",
-              "from": "https://registry.npmjs.org/hoek/-/hoek-2.16.3.tgz",
-              "resolved": "https://registry.npmjs.org/hoek/-/hoek-2.16.3.tgz"
-            },
-            "boom": {
-              "version": "2.10.1",
-              "from": "http://registry.npmjs.org/boom/-/boom-2.10.1.tgz",
-              "resolved": "http://registry.npmjs.org/boom/-/boom-2.10.1.tgz"
-            },
-            "cryptiles": {
-              "version": "2.0.5",
-              "from": "http://registry.npmjs.org/cryptiles/-/cryptiles-2.0.5.tgz",
-              "resolved": "http://registry.npmjs.org/cryptiles/-/cryptiles-2.0.5.tgz"
-            },
-            "sntp": {
-              "version": "1.0.9",
-              "from": "https://registry.npmjs.org/sntp/-/sntp-1.0.9.tgz",
-              "resolved": "https://registry.npmjs.org/sntp/-/sntp-1.0.9.tgz"
-            }
-          }
-        },
-        "aws-sign2": {
-          "version": "0.6.0",
-          "from": "http://registry.npmjs.org/aws-sign2/-/aws-sign2-0.6.0.tgz",
-          "resolved": "http://registry.npmjs.org/aws-sign2/-/aws-sign2-0.6.0.tgz"
-        },
-        "stringstream": {
-          "version": "0.0.5",
-          "from": "http://registry.npmjs.org/stringstream/-/stringstream-0.0.5.tgz",
-          "resolved": "http://registry.npmjs.org/stringstream/-/stringstream-0.0.5.tgz"
-        },
-        "combined-stream": {
-          "version": "1.0.5",
-          "from": "https://registry.npmjs.org/combined-stream/-/combined-stream-1.0.5.tgz",
-          "resolved": "https://registry.npmjs.org/combined-stream/-/combined-stream-1.0.5.tgz",
-          "dependencies": {
-            "delayed-stream": {
-              "version": "1.0.0",
-              "from": "https://registry.npmjs.org/delayed-stream/-/delayed-stream-1.0.0.tgz",
-              "resolved": "https://registry.npmjs.org/delayed-stream/-/delayed-stream-1.0.0.tgz"
-            }
-          }
-        },
-        "isstream": {
-          "version": "0.1.2",
-          "from": "https://registry.npmjs.org/isstream/-/isstream-0.1.2.tgz",
-          "resolved": "https://registry.npmjs.org/isstream/-/isstream-0.1.2.tgz"
-        },
-        "is-typedarray": {
-          "version": "1.0.0",
-          "from": "http://registry.npmjs.org/is-typedarray/-/is-typedarray-1.0.0.tgz",
-          "resolved": "http://registry.npmjs.org/is-typedarray/-/is-typedarray-1.0.0.tgz"
-        },
-        "har-validator": {
-          "version": "2.0.3",
-          "from": "http://registry.npmjs.org/har-validator/-/har-validator-2.0.3.tgz",
-          "resolved": "http://registry.npmjs.org/har-validator/-/har-validator-2.0.3.tgz",
-          "dependencies": {
-            "chalk": {
-              "version": "1.1.1",
-              "from": "https://registry.npmjs.org/chalk/-/chalk-1.1.1.tgz",
-              "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.1.tgz",
-              "dependencies": {
-                "ansi-styles": {
-                  "version": "2.1.0",
-                  "from": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.1.0.tgz",
-                  "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.1.0.tgz"
-                },
-                "escape-string-regexp": {
-                  "version": "1.0.3",
-                  "from": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-1.0.3.tgz",
-                  "resolved": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-1.0.3.tgz"
-                },
-                "has-ansi": {
-                  "version": "2.0.0",
-                  "from": "https://registry.npmjs.org/has-ansi/-/has-ansi-2.0.0.tgz",
-                  "resolved": "https://registry.npmjs.org/has-ansi/-/has-ansi-2.0.0.tgz",
-                  "dependencies": {
-                    "ansi-regex": {
-                      "version": "2.0.0",
-                      "from": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.0.0.tgz",
-                      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.0.0.tgz"
-                    }
-                  }
-                },
-                "strip-ansi": {
-                  "version": "3.0.0",
-                  "from": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.0.tgz",
-                  "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.0.tgz",
-                  "dependencies": {
-                    "ansi-regex": {
-                      "version": "2.0.0",
-                      "from": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.0.0.tgz",
-                      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.0.0.tgz"
-                    }
-                  }
-                },
-                "supports-color": {
-                  "version": "2.0.0",
-                  "from": "https://registry.npmjs.org/supports-color/-/supports-color-2.0.0.tgz",
-                  "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-2.0.0.tgz"
-                }
-              }
-            },
-            "commander": {
-              "version": "2.9.0",
-              "from": "http://registry.npmjs.org/commander/-/commander-2.9.0.tgz",
-              "resolved": "http://registry.npmjs.org/commander/-/commander-2.9.0.tgz",
-              "dependencies": {
-                "graceful-readlink": {
-                  "version": "1.0.1",
-                  "from": "https://registry.npmjs.org/graceful-readlink/-/graceful-readlink-1.0.1.tgz",
-                  "resolved": "https://registry.npmjs.org/graceful-readlink/-/graceful-readlink-1.0.1.tgz"
-                }
-              }
-            },
-            "is-my-json-valid": {
-              "version": "2.12.3",
-              "from": "http://registry.npmjs.org/is-my-json-valid/-/is-my-json-valid-2.12.3.tgz",
-              "resolved": "http://registry.npmjs.org/is-my-json-valid/-/is-my-json-valid-2.12.3.tgz",
-              "dependencies": {
-                "generate-function": {
-                  "version": "2.0.0",
-                  "from": "https://registry.npmjs.org/generate-function/-/generate-function-2.0.0.tgz",
-                  "resolved": "https://registry.npmjs.org/generate-function/-/generate-function-2.0.0.tgz"
-                },
-                "generate-object-property": {
-                  "version": "1.2.0",
-                  "from": "https://registry.npmjs.org/generate-object-property/-/generate-object-property-1.2.0.tgz",
-                  "resolved": "https://registry.npmjs.org/generate-object-property/-/generate-object-property-1.2.0.tgz",
-                  "dependencies": {
-                    "is-property": {
-                      "version": "1.0.2",
-                      "from": "https://registry.npmjs.org/is-property/-/is-property-1.0.2.tgz",
-                      "resolved": "https://registry.npmjs.org/is-property/-/is-property-1.0.2.tgz"
-                    }
-                  }
-                },
-                "jsonpointer": {
-                  "version": "2.0.0",
-                  "from": "https://registry.npmjs.org/jsonpointer/-/jsonpointer-2.0.0.tgz",
-                  "resolved": "https://registry.npmjs.org/jsonpointer/-/jsonpointer-2.0.0.tgz"
-                },
-                "xtend": {
-                  "version": "4.0.1",
-                  "from": "http://registry.npmjs.org/xtend/-/xtend-4.0.1.tgz",
-                  "resolved": "http://registry.npmjs.org/xtend/-/xtend-4.0.1.tgz"
-                }
-              }
-            },
-            "pinkie-promise": {
-              "version": "2.0.0",
-              "from": "http://registry.npmjs.org/pinkie-promise/-/pinkie-promise-2.0.0.tgz",
-              "resolved": "http://registry.npmjs.org/pinkie-promise/-/pinkie-promise-2.0.0.tgz",
-              "dependencies": {
-                "pinkie": {
-                  "version": "2.0.1",
-                  "from": "http://registry.npmjs.org/pinkie/-/pinkie-2.0.1.tgz",
-                  "resolved": "http://registry.npmjs.org/pinkie/-/pinkie-2.0.1.tgz"
-                }
-              }
-            }
-          }
-        }
-      }
-    },
-    "ursa": {
-      "version": "0.9.1",
-      "from": "http://registry.npmjs.org/ursa/-/ursa-0.9.1.tgz",
-      "resolved": "http://registry.npmjs.org/ursa/-/ursa-0.9.1.tgz",
-      "dependencies": {
-        "bindings": {
-          "version": "1.2.1",
-          "from": "https://registry.npmjs.org/bindings/-/bindings-1.2.1.tgz",
-          "resolved": "https://registry.npmjs.org/bindings/-/bindings-1.2.1.tgz"
-        },
-        "nan": {
-          "version": "2.1.0",
-          "from": "http://registry.npmjs.org/nan/-/nan-2.1.0.tgz",
-          "resolved": "http://registry.npmjs.org/nan/-/nan-2.1.0.tgz"
-        }
-      }
-    }
-  }
-}
diff --git a/operations.js b/operations.js
index dd454ae..b883590 100644
--- a/operations.js
+++ b/operations.js
@@ -4,7 +4,7 @@ var url = require('url');
 var crypto = require('crypto');
 var exec = require('child_process').exec;
 var _ = require("lodash");
-var key = require('ursa').coercePrivateKey;
+var NodeRSA = require('node-rsa');
 
 exports.operations = function(config){
     return {
@@ -21,11 +21,11 @@ exports.operations = function(config){
                 "X-Ops-UserId": config.name
             }
 
-            var request_headers = _.map(_.pairs(request_headers), function(header){
+            var request_headers = _.map(_.toPairs(request_headers), function(header){
                 return header.join(":");
             }).join("\n");
 
-            var signature = key(config.key_contents).privateEncrypt(request_headers, 'utf8', 'base64');
+            var signature = new NodeRSA(config.key_contents).encryptPrivate(request_headers, 'base64', 'utf8');
 
             var auth_headers = {
                 "Accept": "application/json",
diff --git a/package.json b/package.json
index b0228d5..d6582ae 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "chef-api",
-  "version": "0.6.0",
+  "version": "0.6.4",
   "description": "A simple chef server api wrapper",
   "author": "Norman Joyner <norman.joyner@gmail.com>",
   "license": "GPLv2",
@@ -11,9 +11,9 @@
     "url": "git://github.com/normanjoyner/chef-api.git"
   },
   "dependencies": {
-    "lodash": "^2.2.1",
-    "request": "^2.61.0",
-    "ursa": "^0.9.1"
+    "lodash": "^4.17.4",
+    "node-rsa": "^0.4.2",
+    "request": "^2.63.0"
   },
   "engines": {
     "node": "*"
@@ -28,4 +28,4 @@
     "chef-server",
     "api"
   ]
-}
\ No newline at end of file
+}