diff --git a/package-lock.json b/package-lock.json
index 3a7b899..c62da4f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -61,7 +61,6 @@
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/bcrypt-pbkdf/-/bcrypt-pbkdf-1.0.0.tgz",
       "integrity": "sha1-PKdrhSQccXC/fZcD57mqdGMAQNQ=",
-      "optional": true,
       "requires": {
         "tweetnacl": "^0.14.3"
       }
@@ -157,7 +156,6 @@
       "version": "0.1.1",
       "resolved": "https://registry.npmjs.org/ecc-jsbn/-/ecc-jsbn-0.1.1.tgz",
       "integrity": "sha1-D8c6ntXw1Tw4GTOYUj735UN3dQU=",
-      "optional": true,
       "requires": {
         "jsbn": "~0.1.0"
       }
@@ -316,20 +314,10 @@
       "resolved": "https://registry.npmjs.org/isstream/-/isstream-0.1.2.tgz",
       "integrity": "sha1-R+Y/evVa+m+S4VAOaQ64uFKcCZo="
     },
-    "jodid25519": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/jodid25519/-/jodid25519-1.0.2.tgz",
-      "integrity": "sha1-BtSRIlUJNBlHfUJWM2BuDpB4KWc=",
-      "optional": true,
-      "requires": {
-        "jsbn": "~0.1.0"
-      }
-    },
     "jsbn": {
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/jsbn/-/jsbn-0.1.0.tgz",
-      "integrity": "sha1-ZQmH2g3XT06/WhE3eiqi0nPpff0=",
-      "optional": true
+      "integrity": "sha1-ZQmH2g3XT06/WhE3eiqi0nPpff0="
     },
     "json-schema": {
       "version": "0.2.3",
@@ -476,6 +464,11 @@
         "request": "~2.51.0"
       }
     },
+    "safer-buffer": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/safer-buffer/-/safer-buffer-2.1.2.tgz",
+      "integrity": "sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg=="
+    },
     "sax": {
       "version": "0.5.8",
       "resolved": "https://registry.npmjs.org/sax/-/sax-0.5.8.tgz",
@@ -644,9 +637,9 @@
       }
     },
     "sshpk": {
-      "version": "1.10.1",
-      "resolved": "https://registry.npmjs.org/sshpk/-/sshpk-1.10.1.tgz",
-      "integrity": "sha1-MOGl0ykkSXShr2FREznVla9mOLA=",
+      "version": "1.16.1",
+      "resolved": "https://registry.npmjs.org/sshpk/-/sshpk-1.16.1.tgz",
+      "integrity": "sha512-HXXqVUq7+pcKeLqqZj6mHFUMvXtOJt1uoUx09pFW6011inTMxqI8BA8PM95myrIyyKwdnzjdFjLiE6KBPVtJIg==",
       "requires": {
         "asn1": "~0.2.3",
         "assert-plus": "^1.0.0",
@@ -654,15 +647,18 @@
         "dashdash": "^1.12.0",
         "ecc-jsbn": "~0.1.1",
         "getpass": "^0.1.1",
-        "jodid25519": "^1.0.0",
         "jsbn": "~0.1.0",
+        "safer-buffer": "^2.0.2",
         "tweetnacl": "~0.14.0"
       },
       "dependencies": {
         "asn1": {
-          "version": "0.2.3",
-          "resolved": "https://registry.npmjs.org/asn1/-/asn1-0.2.3.tgz",
-          "integrity": "sha1-2sh4dxPJlmhJ/IGAd36+nB3fO4Y="
+          "version": "0.2.4",
+          "resolved": "https://registry.npmjs.org/asn1/-/asn1-0.2.4.tgz",
+          "integrity": "sha512-jxwzQpLQjSmWXgwaCZE9Nz+glAG01yF1QnWgbhGwHI5A6FRIEY6IVqtHhIepHqI7/kyEyQEagBC5mBEFlIYvdg==",
+          "requires": {
+            "safer-buffer": "~2.1.0"
+          }
         },
         "assert-plus": {
           "version": "1.0.0",
@@ -715,8 +711,7 @@
     "tweetnacl": {
       "version": "0.14.3",
       "resolved": "https://registry.npmjs.org/tweetnacl/-/tweetnacl-0.14.3.tgz",
-      "integrity": "sha1-PaOC9nDyXe1417PReSEZvKC3Ey0=",
-      "optional": true
+      "integrity": "sha1-PaOC9nDyXe1417PReSEZvKC3Ey0="
     },
     "underscore": {
       "version": "1.8.3",