diff --git a/npm-shrinkwrap.json b/npm-shrinkwrap.json
index d9fda659f..36f145bcf 100644
--- a/npm-shrinkwrap.json
+++ b/npm-shrinkwrap.json
@@ -2,242 +2,243 @@
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-          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-1.0.27-1.tgz",
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-              "resolved": "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.2.tgz"
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-              "resolved": "https://registry.npmjs.org/isarray/-/isarray-0.0.1.tgz"
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-              "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-0.10.31.tgz"
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-              "from": "https://registry.npmjs.org/inherits/-/inherits-2.0.3.tgz",
-              "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.3.tgz"
-            }
-          }
+          "from": "readable-stream@1.0.27-1",
+          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-1.0.27-1.tgz"
         }
       }
     },
     "supererror": {
       "version": "0.7.1",
-      "from": "https://registry.npmjs.org/supererror/-/supererror-0.7.1.tgz",
+      "from": "supererror@>=0.7.1 <0.8.0",
       "resolved": "https://registry.npmjs.org/supererror/-/supererror-0.7.1.tgz",
       "dependencies": {
         "colors": {
           "version": "1.1.2",
-          "from": "https://registry.npmjs.org/colors/-/colors-1.1.2.tgz",
+          "from": "colors@>=1.1.2 <2.0.0",
           "resolved": "https://registry.npmjs.org/colors/-/colors-1.1.2.tgz"
-        },
-        "prettyjson": {
-          "version": "1.1.3",
-          "from": "https://registry.npmjs.org/prettyjson/-/prettyjson-1.1.3.tgz",
-          "resolved": "https://registry.npmjs.org/prettyjson/-/prettyjson-1.1.3.tgz",
-          "dependencies": {
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-              "from": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
-              "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz"
-            }
-          }
         }
       }
     },
+    "supports-color": {
+      "version": "2.0.0",
+      "from": "supports-color@>=2.0.0 <3.0.0",
+      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-2.0.0.tgz"
+    },
     "tail-stream": {
       "version": "0.2.1",
       "from": "https://registry.npmjs.org/tail-stream/-/tail-stream-0.2.1.tgz",
       "resolved": "https://registry.npmjs.org/tail-stream/-/tail-stream-0.2.1.tgz"
     },
+    "through": {
+      "version": "2.3.8",
+      "from": "through@>=2.0.0 <3.0.0",
+      "resolved": "https://registry.npmjs.org/through/-/through-2.3.8.tgz"
+    },
+    "through2": {
+      "version": "2.0.3",
+      "from": "through2@>=2.0.0 <3.0.0",
+      "resolved": "https://registry.npmjs.org/through2/-/through2-2.0.3.tgz"
+    },
+    "time-stamp": {
+      "version": "1.0.1",
+      "from": "time-stamp@>=1.0.0 <2.0.0",
+      "resolved": "https://registry.npmjs.org/time-stamp/-/time-stamp-1.0.1.tgz"
+    },
     "tldjs": {
       "version": "1.7.0",
-      "from": "https://registry.npmjs.org/tldjs/-/tldjs-1.7.0.tgz",
+      "from": "tldjs@>=1.6.2 <2.0.0",
       "resolved": "https://registry.npmjs.org/tldjs/-/tldjs-1.7.0.tgz",
       "dependencies": {
         "punycode": {
           "version": "1.4.1",
-          "from": "https://registry.npmjs.org/punycode/-/punycode-1.4.1.tgz",
+          "from": "punycode@>=1.4.1 <2.0.0",
           "resolved": "https://registry.npmjs.org/punycode/-/punycode-1.4.1.tgz"
         }
       }
     },
+    "tsscmp": {
+      "version": "1.0.5",
+      "from": "tsscmp@1.0.5",
+      "resolved": "https://registry.npmjs.org/tsscmp/-/tsscmp-1.0.5.tgz"
+    },
+    "tv4": {
+      "version": "1.2.7",
+      "from": "tv4@>=1.1.9 <2.0.0",
+      "resolved": "https://registry.npmjs.org/tv4/-/tv4-1.2.7.tgz"
+    },
+    "type-is": {
+      "version": "1.6.14",
+      "from": "type-is@>=1.6.13 <1.7.0",
+      "resolved": "https://registry.npmjs.org/type-is/-/type-is-1.6.14.tgz"
+    },
+    "uid-safe": {
+      "version": "2.1.3",
+      "from": "uid-safe@2.1.3",
+      "resolved": "https://registry.npmjs.org/uid-safe/-/uid-safe-2.1.3.tgz"
+    },
+    "uid2": {
+      "version": "0.0.3",
+      "from": "uid2@>=0.0.0 <0.1.0",
+      "resolved": "https://registry.npmjs.org/uid2/-/uid2-0.0.3.tgz"
+    },
     "underscore": {
       "version": "1.8.3",
-      "from": "https://registry.npmjs.org/underscore/-/underscore-1.8.3.tgz",
+      "from": "underscore@>=1.7.0 <2.0.0",
       "resolved": "https://registry.npmjs.org/underscore/-/underscore-1.8.3.tgz"
     },
-    "ursa": {
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-      "from": "https://registry.npmjs.org/ursa/-/ursa-0.9.4.tgz",
-      "resolved": "https://registry.npmjs.org/ursa/-/ursa-0.9.4.tgz",
-      "dependencies": {
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-          "resolved": "https://registry.npmjs.org/bindings/-/bindings-1.2.1.tgz"
-        },
-        "nan": {
-          "version": "2.4.0",
-          "from": "https://registry.npmjs.org/nan/-/nan-2.4.0.tgz",
-          "resolved": "https://registry.npmjs.org/nan/-/nan-2.4.0.tgz"
-        }
-      }
+    "unpipe": {
+      "version": "1.0.0",
+      "from": "unpipe@1.0.0",
+      "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz"
+    },
+    "url": {
+      "version": "0.10.3",
+      "from": "url@0.10.3",
+      "resolved": "https://registry.npmjs.org/url/-/url-0.10.3.tgz"
+    },
+    "util-deprecate": {
+      "version": "1.0.2",
+      "from": "util-deprecate@>=1.0.1 <1.1.0",
+      "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz"
+    },
+    "utils-merge": {
+      "version": "1.0.0",
+      "from": "utils-merge@1.0.0",
+      "resolved": "http://registry.npmjs.org/utils-merge/-/utils-merge-1.0.0.tgz"
     },
     "valid-url": {
       "version": "1.0.9",
-      "from": "https://registry.npmjs.org/valid-url/-/valid-url-1.0.9.tgz",
+      "from": "valid-url@>=1.0.9 <2.0.0",
       "resolved": "https://registry.npmjs.org/valid-url/-/valid-url-1.0.9.tgz"
     },
     "validator": {
       "version": "4.9.0",
-      "from": "https://registry.npmjs.org/validator/-/validator-4.9.0.tgz",
-      "resolved": "https://registry.npmjs.org/validator/-/validator-4.9.0.tgz",
+      "from": "validator@>=4.9.0 <5.0.0",
+      "resolved": "https://registry.npmjs.org/validator/-/validator-4.9.0.tgz"
+    },
+    "vary": {
+      "version": "1.1.0",
+      "from": "vary@>=1.1.0 <1.2.0",
+      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.0.tgz"
+    },
+    "vasync": {
+      "version": "1.6.4",
+      "from": "vasync@>=1.6.4 <2.0.0",
+      "resolved": "https://registry.npmjs.org/vasync/-/vasync-1.6.4.tgz",
       "dependencies": {
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-          "version": "1.1.0",
-          "from": "https://registry.npmjs.org/depd/-/depd-1.1.0.tgz",
-          "resolved": "https://registry.npmjs.org/depd/-/depd-1.1.0.tgz"
+        "extsprintf": {
+          "version": "1.2.0",
+          "from": "extsprintf@1.2.0",
+          "resolved": "https://registry.npmjs.org/extsprintf/-/extsprintf-1.2.0.tgz"
+        },
+        "verror": {
+          "version": "1.6.0",
+          "from": "verror@1.6.0",
+          "resolved": "https://registry.npmjs.org/verror/-/verror-1.6.0.tgz"
         }
       }
     },
+    "vinyl": {
+      "version": "0.5.3",
+      "from": "vinyl@>=0.5.0 <0.6.0",
+      "resolved": "https://registry.npmjs.org/vinyl/-/vinyl-0.5.3.tgz"
+    },
+    "vinyl-sourcemaps-apply": {
+      "version": "0.2.1",
+      "from": "vinyl-sourcemaps-apply@>=0.2.0 <0.3.0",
+      "resolved": "https://registry.npmjs.org/vinyl-sourcemaps-apply/-/vinyl-sourcemaps-apply-0.2.1.tgz"
+    },
+    "when": {
+      "version": "2.0.1",
+      "from": "when@>=2.0.1 <2.1.0",
+      "resolved": "http://registry.npmjs.org/when/-/when-2.0.1.tgz"
+    },
+    "wordwrap": {
+      "version": "0.0.3",
+      "from": "wordwrap@>=0.0.2 <0.1.0",
+      "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-0.0.3.tgz"
+    },
+    "wrap-ansi": {
+      "version": "2.1.0",
+      "from": "wrap-ansi@>=2.0.0 <3.0.0",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz"
+    },
+    "wrappy": {
+      "version": "1.0.2",
+      "from": "wrappy@>=1.0.0 <2.0.0",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz"
+    },
     "x509": {
       "version": "0.2.6",
-      "from": "https://registry.npmjs.org/x509/-/x509-0.2.6.tgz",
+      "from": "x509@>=0.2.4 <0.3.0",
       "resolved": "https://registry.npmjs.org/x509/-/x509-0.2.6.tgz",
       "dependencies": {
         "nan": {
           "version": "2.2.0",
-          "from": "https://registry.npmjs.org/nan/-/nan-2.2.0.tgz",
+          "from": "nan@2.2.0",
           "resolved": "https://registry.npmjs.org/nan/-/nan-2.2.0.tgz"
         }
       }
+    },
+    "xml2js": {
+      "version": "0.4.15",
+      "from": "xml2js@0.4.15",
+      "resolved": "https://registry.npmjs.org/xml2js/-/xml2js-0.4.15.tgz"
+    },
+    "xmlbuilder": {
+      "version": "2.6.2",
+      "from": "xmlbuilder@2.6.2",
+      "resolved": "https://registry.npmjs.org/xmlbuilder/-/xmlbuilder-2.6.2.tgz"
+    },
+    "xtend": {
+      "version": "4.0.1",
+      "from": "xtend@>=4.0.0 <5.0.0",
+      "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.1.tgz"
+    },
+    "y18n": {
+      "version": "3.2.1",
+      "from": "y18n@>=3.2.1 <4.0.0",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-3.2.1.tgz"
     }
   }
 }
diff --git a/package.json b/package.json
index 3659bd5ca..cb35e5ed4 100644
--- a/package.json
+++ b/package.json
@@ -66,7 +66,6 @@
     "tail-stream": "https://registry.npmjs.org/tail-stream/-/tail-stream-0.2.1.tgz",
     "tldjs": "^1.6.2",
     "underscore": "^1.7.0",
-    "ursa": "^0.9.3",
     "valid-url": "^1.0.9",
     "validator": "^4.9.0",
     "x509": "^0.2.4"
diff --git a/src/cert/acme.js b/src/cert/acme.js
index 0afce8976..64ee647c9 100644
--- a/src/cert/acme.js
+++ b/src/cert/acme.js
@@ -4,13 +4,13 @@ var assert = require('assert'),
     async = require('async'),
     crypto = require('crypto'),
     debug = require('debug')('box:cert/acme'),
+    execSync = require('safetydance').child_process.execSync,
     fs = require('fs'),
     parseLinks = require('parse-links'),
     path = require('path'),
     paths = require('../paths.js'),
     safe = require('safetydance'),
     superagent = require('superagent'),
-    ursa = require('ursa'),
     util = require('util'),
     _ = require('underscore');
 
@@ -81,20 +81,29 @@ function b64(str) {
    return urlBase64Encode(buf.toString('base64'));
 }
 
+function getModulus(pem) {
+    assert(util.isBuffer(pem));
+
+    var stdout = execSync('openssl rsa -modulus -noout', { input: pem, encoding: 'utf8' });
+    if (!stdout) return null;
+    var match = stdout.match(/Modulus=([0-9a-fA-F]+)$/m);
+    if (!match) return null;
+    return Buffer.from(match[1], 'hex');
+}
+
 Acme.prototype.sendSignedRequest = function (url, payload, callback) {
     assert.strictEqual(typeof url, 'string');
     assert.strictEqual(typeof payload, 'string');
     assert.strictEqual(typeof callback, 'function');
 
     assert(util.isBuffer(this.accountKeyPem));
-    var privateKey = ursa.createPrivateKey(this.accountKeyPem);
 
     var header = {
         alg: 'RS256',
         jwk: {
-            e: b64(privateKey.getExponent()),
+            e: b64(Buffer.from([0x01, 0x00, 0x01])), // exponent - 65537
             kty: 'RSA',
-            n: b64(privateKey.getModulus())
+            n: b64(getModulus(this.accountKeyPem))
         }
     };
  
@@ -107,9 +116,9 @@ Acme.prototype.sendSignedRequest = function (url, payload, callback) {
 
         var protected64 = b64(JSON.stringify(_.extend({ }, header, { nonce: nonce })));
 
-        var signer = ursa.createSigner('sha256');
+        var signer = crypto.createSign('RSA-SHA256');
         signer.update(protected64 + '.' + payload64, 'utf8');
-        var signature64 = urlBase64Encode(signer.sign(privateKey, 'base64'));
+        var signature64 = urlBase64Encode(signer.sign(this.accountKeyPem, 'base64'));
 
         var data = {
             header: header,
@@ -207,12 +216,11 @@ Acme.prototype.prepareHttpChallenge = function (challenge, callback) {
     var token = challenge.token;
 
     assert(util.isBuffer(this.accountKeyPem));
-    var privateKey = ursa.createPrivateKey(this.accountKeyPem);
 
     var jwk = {
-        e: b64(privateKey.getExponent()),
+        e: b64(Buffer.from([0x01, 0x00, 0x01])), // Exponent - 65537
         kty: 'RSA',
-        n: b64(privateKey.getModulus())
+        n: b64(getModulus(this.accountKeyPem))
     };
 
     var shasum = crypto.createHash('sha256');
@@ -318,7 +326,6 @@ Acme.prototype.createKeyAndCsr = function (domain, callback) {
     var outdir = paths.APP_CERTS_DIR;
     var csrFile = path.join(outdir, domain + '.csr');
     var privateKeyFile = path.join(outdir, domain + '.key');
-    var execSync = safe.child_process.execSync;
 
     if (safe.fs.existsSync(privateKeyFile)) {
         // in some old releases, csr file was corrupt. so always regenerate it
@@ -358,8 +365,6 @@ Acme.prototype.downloadChain = function (linkHeader, callback) {
         if (result.statusCode !== 200) return callback(new AcmeError(AcmeError.EXTERNAL_ERROR, util.format('Failed to get cert. Expecting 200, got %s %s', result.statusCode, result.text)));
 
         var chainDer = result.text;
-        var execSync = safe.child_process.execSync;
-
         var chainPem = execSync('openssl x509 -inform DER -outform PEM', { input: chainDer }); // this is really just base64 encoding with header
         if (!chainPem) return callback(new AcmeError(AcmeError.INTERNAL_ERROR, safe.error));
 
@@ -385,7 +390,6 @@ Acme.prototype.downloadCertificate = function (domain, certUrl, callback) {
         if (result.statusCode !== 200) return callback(new AcmeError(AcmeError.EXTERNAL_ERROR, util.format('Failed to get cert. Expecting 200, got %s %s', result.statusCode, result.text)));
 
         var certificateDer = result.text;
-        var execSync = safe.child_process.execSync;
 
         safe.fs.writeFileSync(path.join(outdir, domain + '.der'), certificateDer);
         debug('downloadCertificate: cert der file for %s saved', domain);